Suzuki RM-Z250 Owner's Service Manual

Suzuki RM-Z250 is a high-performance motocross bike designed for experienced riders. It features a powerful 249cc, 4-stroke, liquid-cooled engine that delivers plenty of power and torque for tackling challenging tracks. The RM-Z250 also boasts a lightweight and agile chassis, making it easy to maneuver and control. With its advanced suspension system and high-quality components, the RM-Z250 is the perfect choice for riders who demand the best from their motocross machine.

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RM-Z250

OWNER’S SERVICE MANUAL

Part No. 99011-10H50-01A

This manual should be considered a permanent part of the motorcycle and should remain with the motorcycle when resold or otherwise transferred to a new owner or operator.

The manual contains important safety information and instructions which should be read carefully before operating the motorcycle.

FOREWORD

This manual is presented as a means whereby you can maintain your RM-Z250 in top working condition at all times. Your riding skill and the maintenance steps outlined in this manual will assure you of top performance from your machine under any type of competition.

We sincerely wish you and your Suzuki motorcycle a successful partnership for many years of happy riding.

All information, illustrations, photographs and specifications contained in the manual are based on the latest product information available at the time of publication. Due to improvements or other changes, there may be some discrepancies in this manual.

Suzuki reserves the right to make production changes at any time, without notice and without incurring any obligation to make the same or similar changes to vehicles previous built or sold.

Suzuki Motor Corporation believes in conservation and protection of Earth’s natural resources. To that end, we encourage every vehicle owner to recycle, trade in, or properly dispose of, as appropriate, used motor oil, engine coolant, and other fluid, and tires.

WARNING/CAUTION/NOTE

Please read this manual and follow its instructions carefully. To emphasize special information, the symbol

and the words WARNING, CAUTION and NOTE have special meanings. Pay special attention to the messages highlighted by these signal words:

WARNING

Indicates a potential hazard that could result in death or injury.

CAUTION

Indicates a potential hazard that could result in motorcycle damage.

NOTE:

Indicates special information to make maintenance easier or instructions clearer.

c COPYRIGHT SUZUKI MOTOR CORPORATION 2006

GENERAL CONSIDERATIONS

• Wear a helmet and goggles

A helmet is the most important piece of gear to wear. Helmets do not reduce essential vision or hearing. Generally, helmets do not cause or intensify injury if you crash. Helmets simply help your skull protect your intelligence, your memory, your personality, and your life.

Your eyesight is equally valuable. Wearing suitable eye protection can help keep your vision unblurred by the wind and help shield your eyes from branches and airborne matter like bugs, dirt, or pebbles kicked up by tires. Wear a helmet and eye protection every time you ride.

• Wear protective gear

Wear proper clothing when you ride. Avoid loose clothes or scarves, which could get caught in moving parts. Abrasion injuries can be minimized by wearing protective clothing including gloves, strong boots that fit over the ankle, long pants, and a long sleeve shirt or jackets. Experienced riders often wear a kidney belt and chest or back protector for additional comfort and protection.

• Inspect your machine before riding

Before each use, perform an inspection per “Periodic Inspection” section starting on page 2-3.

• No Passengers

Suzuki RMs are designed for the rider only.

• Practice on level ground

Before you begin riding, you should find a good place to practice the skills you need to ride safely. Find a flat, open area with enough space to maneuver. Check with your Suzuki dealer or call police department if you do not know where you can ride.

Review the controls on your motorcycle before riding.

• Know your limits

Always ride within the boundaries of your own skills. Knowing these limits and staying within them will help you avoid accidents. Ride only in events appropriate for your experience.

Safely competing on a motorcycle requires that your mental and physical skills are fully part of the experience. You should not attempt to operate a motorcycle, especially one with two wheels, if you are tired or under the influence of alcohol or other drugs. Alcohol, illegal drugs, and even some prescription and over-the-counter drugs and cause drowsiness, loss of coordination, loss of balance, and loss of good judgement. If you are tired or under the influence of alcohol or other drugs, PLEASE DO NOT RIDE your motorcycle.

• Conclusion

The actions of other riders are unpredictable.

Your motorcycle’s condition can change. These factors can best be dealt with by giving every ride your full attention.

Circumstances beyond your control could lead to an accident. You need to prepare for the unexpected by wearing a helmet and other protective gear, and practicing safe riding techniques to minimize the damage to you and your machine.

May all of your rides on your new Suzuki be winning rides!

SERIAL NUMBER LOCATION

The frame number 1 is stamped on the steering head as shown in the photograph. The engine serial number 2 is stamped on the right side of the crankcase assembly.

Write down the serial numbers here for your future reference.

Frame No.

Engine No.

WARNINGS FOR SERVICING

WARNING

Never run the engine indoors or in a garage. Exhaust gas contains carbon monoxide, a gas that is colorless and odorless and can cause death or severe injury.

Only run the engine outdoors where there is fresh air.

WARNING

Fuel can catch on fire if you do not handle it properly. Gasoline vapors can catch fire easily.

Do not smoke when servicing the machine.

Do not service the machine in an area where there are open flames or sparks.

WARNING

Hot engine and muffler can burn you.

Wait until the engine and muffler cools before servicing.

WARNING

Brake fluids and engine coolant can be hazardous to humans and pets. Brake fluid and engine coolant are harmful or fatal if swallowed, and harmful if it comes in contact with your skin or eyes.

Keep brake fluid and engine coolant away from children. Call your doctor immediately if swallowed, and induce vomiting.

Flush eyes or skin with water if either brake fluid or engine coolant gets in eyes or comes in contact with skin.

WARNING

Servicing the machine with engine running can be hazardous. You can be caught in the moving parts such as the drive chain, sprockets etc.

Be sure to stop the engine when servicing the machine.

WARNING

Servicing the machine without proper clothes and protective gear can be hazardous. You can be injured if you do not wear proper clothes and protective gear.

Be sure to wear proper clothes and shoes for servicing and wear protective glasses, mask or gloves as necessary.

PRECAUTIONS FOR

SERVICING

• Replace gaskets, snap rings, circlips, O-rings and cotter pins with new ones.

• Take care not to expand the end gap larger than required to slip the circlip over the shaft when installing a circlip.

• Use special tools where specified.

• Use genuine SUZUKI parts and recommended oil.

• When two or more persons work together, pay attention to the safety of each other.

• After reassembly, inspect parts for tightness and operation.

REPLACEMENT PARTS

Use only genuine SUZUKI replacement parts or their equivalent. Genuine SUZUKI parts are high quality parts which are designed and built specially for SUZUKI vehicles.

NOTE:

Use of replacement parts which are not equivalent in quality to genuine SUZUKI parts can lead to performance problems and damage.

SYMBOL MARKS AND MATERIALS

Listed in the table below are the symbols indicating instructions and other information. The meaning of each symbol is also included in the table.

SYMBOL DEFINITION

Torque control required.

Data beside it indicates specified torque.

SYMBOL DEFINITION

Apply THREAD LOCK SUPER “1360”.

99000-32130

Apply oil. Use engine oil or transmission oil unless otherwise specified.

Apply molybdenum oil solution.

(Mixture of engine oil and SUZUKI

MOLY PASTE in a ratio of 1:1)

Apply SUZUKI SUPER GREASE “A” or equivalent grease.

99000-25010

Apply SUZUKI SILICONE GREASE.

99000-25100

Use SUZUKI FORK OIL SS-05 or equivalent fork oil.

99000-99001-SS5

Use SUZUKI REAR SUSPENSION OIL

SS-25 or equivalent rear suspension oil.

99000-99001-S25

Use engine coolant.

Apply or use brake fluid. (DOT 4)

Measure in voltage range.

Apply SUZUKI MOLY PASTE.

99000-25140

Apply SUZUKI BOND “1215” or equivalent bond.

99000-31110

Apply SUZUKI BOND “1207B”.

99000-31140

Apply THREAD LOCK SUPER “1303”.

99000-32030

Apply THREAD LOCK SUPER “1322” or equivalent thread lock.

99000-32110

Apply THREAD LOCK “1342”.

99000-32050

Measure in resistance range.

Use special tool.

Indication of service data.

Replace a part with a new one when reassembling.

GROUP INDEX

GENERAL INFORMATION

PERIODIC MAINTENANCE

TROUBLESHOOTING

MACHINE TUNING

ENGINE REMOVAL AND INSTALLATION

CYLINDER HEAD, CYLINDER AND PISTON

CLUTCH

KICK STARTER

GEARSHIFTING

TRANSMISSION AND CRANKSHAFT

LUBRICATION SYSTEM

FUEL SYSTEM

COOLING SYSTEM

ELECTRICAL SYSTEM

FRONT AND REAR WHEELS

FRONT AND REAR BRAKES

FRONT FORK AND STEERING

REAR SUSPENSION

SERVICING INFORMATION

GENERAL INFORMATION

GENERAL INFORMATION 1-1

1

LOCATION OF PARTS ............................................................................... 1- 2

ACCESSORY ............................................................................................... 1- 3

SIDE STAND ......................................................................................... 1- 3

FUEL AND OIL RECOMMENDATION ........................................................ 1- 3

OPERATING INSTRUCTIONS .................................................................... 1- 4

STARTING THE ENGINE ...................................................................... 1- 4

STOPPING THE ENGINE ..................................................................... 1- 5

TRANSMISSION ................................................................................... 1- 5

BREAK-IN (RUNNING-IN) ........................................................................... 1- 6

WHEN THE MOTORCYCLE IS NEW ................................................... 1- 6

WHEN ENGINE PARTS ARE REPLACED ........................................... 1- 6

EXTERIOR PARTS ...................................................................................... 1- 7

COUNTRY AND AREA CODES

The following codes stand for the applicable country(-ies) and area(-s).

CODE

000

E-03

E-19

E-28

COUNTRY or AREA

Japan

U.S.A.

E.U.

Canada

EFFECTIVE FRAME NO.

JS1RJ41A000 500001 –

JS1RJ41C 72 100001 –

JS1RJ41A000 500001 –

JS1RJ41C 72 100001 –

1-2 GENERAL INFORMATION

LOCATION OF PARTS

Clutch lever

Hot starter lever

3 Engine stop switch

Front brake lever

Throttle grip

6 Fuel tank cap

7 Carburetor starter knob

8 Gearshift lever

9 Front suspension compression damping adjuster

0 Front suspension rebound damping adjuster

A Kick starter lever

B Rear brake pedal

C Rear suspension compression damping adjuster

D Rear suspension rebound damping adjuster

ACCESSORY

SIDE STAND

This motorcycle is not equipped with a side stand. To support the motorcycle for a short period of time, use the accessory side stand that comes supplied with the motorcycle. When servicing the motorcycle, use a service stand and support the underneath of the engine securely. When operating the motorcycle, make sure to remove the accessory side stand.

FUEL AND OIL RECOMMENDATION

Gasoline: Use only unleaded gasoline of at least 90 pump octane (R/2 + M/2 method). ..... For USA and Canada

Use only unleaded gasoline of at least 95 octane.

(Research method) .................. For other countries

Engine oil: SUZUKI recommends the use of SUZUKI PERFOR-

MANCE 4 MOTOR OIL or equivalent engine oil. Use of SF/SG or SH/SJ in API with JASO MA. The recommended viscosity is SAE 10W-40. If an SAE

10W-40 oil is not available, select an alternative according to the right chart.

............................................................................. For E-03

MOTUL 300V 10W-40 (recommendation oil) or use a premium quality 4-stroke motor oil to ensure longer service life of your motorcycle. Use of SF/SG or SH/

SJ in API with JASO MA. The recommended viscosity is SAE 10W-40. If an SAE 10W-40 motor oil is not available, select an alternative according to the right chart.

................................................................. For others

Fuel tank capacity: 7.0 L (1.8/1.5 US/lmp gal)

WARNING

Gasoline is a flammable material that can cause fire hazard or burns. When handling gasoline, make sure to stop the engine and keep away from fire or spark.

GENERAL INFORMATION 1-3

1-4 GENERAL INFORMATION

OPERATING INSTRUCTIONS

CAUTION

Leaving the engine at idling speed after riding will cause engine overheat as this competition motorcycle does not have the radiator cooling fan and coolant reservoir. Riding the motorcycle under severe conditions such as muddy or sandy terrain with high ambient temperature can shorten time to be overheated.

Do not leave the engine at idling after riding the motorcycle. Inspect the radiator for proper coolant level before riding for practice and race.

STARTING THE ENGINE

Inspect the engine oil level, coolant level and air cleaner condition before starting the engine.

When the engine is cold:

1) Turn the fuel valve lever to the “ON” position.

2) Shift the transmission into neutral.

NOTE:

Do not repeatedly operate the throttle with the engine starting, stopping and idling. The accelerator pump may foul the spark plugs with excess fuel.

ON OFF

3) Pull the starter knob 1 .

4) Find the kick starter lever position around the top so that the resistance to depress the kick starter lever is fully felt by pushing down the kick starter lever slowly.

5) Kick the engine over, leaving the throttle closed.

CAUTION

When kick-starting the engine, make sure to remove the side stand.

6) Return the starter knob when the engine revs at steady speed.

NOTE:

When the clutch lever is pulled, the motorcycle can be started with the transmission in any gear.

When the engine is already warm or restarts:

1) Pull the hot starter lever 1 .

2) Kick the engine over, leaving the throttle closed without using the starter knob.

3) Return the hot starter lever back immediately after the engine starts.

NOTE:

If the engine fails starting, open the throttle fully and depress the kick starter lever slowly about 4 – 5 times to clear too rich fuel mixtures in the engine. Then, kick the engine over, leaving the throttle closed with the hot starter lever pulled in.

CAUTION

Racing the engine in neutral will exceed the engine speed limit. Exceeding the engine speed limit can damage the engine moving parts.

Do not race the engine at high speed to avoid the engine damage.

Conditions when the hot starter lever or starter knob is used

Engine Condition Hot Starter Lever Starter Knob

Pull in (ON) Push back (OFF) Already Warm

Restarting after falling

Cold

Pull in (ON)

No use (OFF)

Push back (OFF)

Use (ON)

STOPPING THE ENGINE

1) Shift the transmission into neutral.

2) Turn the fuel valve lever to the “OFF” position.

3) Push the engine stop switch 1 to stop the engine.

WARNING

Leaving the fuel valve in the “ON” position may cause carburetor overflow. This can cause a fire or severe engine damage when you start the engine.

Always leave the fuel valve in the “OFF” position when the engine is not running.

TRANSMISSION

This motorcycle has a 5-speed transmission. Neutral is located between low and 2nd. Engage first gear by pressing the lever down from the neutral position. You can shift into higher gears by lifting on the shift lever once for each gear. When neutral is desired, press or lift the lever to a position halfway between low and 2nd gear.

GENERAL INFORMATION 1-5

1-6 GENERAL INFORMATION

BREAK-IN (RUNNING-IN)

WHEN THE MOTORCYCLE IS NEW

1) Warm up the engine before starting off.

2) Ride for 60 minutes using less than 1/2 throttle opening.

3) Ride for 60 minutes using less than 3/4 throttle opening.

NOTE:

* The break-in (running-in) period is the period of greatest wear.

* The bolts and nuts of the new machine can loosen quickly. Be sure to retighten the bolts and nuts during the break-in (running-in) period.

WHEN ENGINE PARTS ARE REPLACED

Follow the same procedure when any of the following parts are replaced:

Piston

Piston ring

Cylinder

Crankshaft

Crankshaft bearing

1/2

FULL

OPEN

EXTERIOR PARTS

GENERAL INFORMATION 1-7

6 N.m

(0.6 kgf.m, 4.5 lb-ft)

4.4 mm (0.17 in)

15 mm

(0.59 in)

9 mm

(0.35 in)

4.4 mm (0.17 in)

16 mm

(0.63 in)

11 mm

(0.43 in)

6 mm (0.24 in)

16 mm

(0.63 in)

10 mm

(0.39 in)

– MEMO –

PERIODIC MAINTENANCE

PERIODIC MAINTENANCE 2-1

PERIODIC MAINTENANCE ........................................................................ 2- 3

INSPECTION BEFORE PRACTICE ...................................................... 2- 3

INSPECTION BEFORE RACE

(All items of inspection before practice on previous page plus) .... 2- 4

PERIODIC MAINTENANCE CHART .................................................... 2- 5

SPARK PLUG .............................................................................................. 2- 7

AIR CLEANER ............................................................................................. 2- 9

AIR CLEANER ELEMENT REMOVAL ................................................. 2- 9

WASHING .............................................................................................. 2- 9

INSTALLATION ..................................................................................... 2- 9

ENGINE OIL AND OIL FILTER ................................................................... 2-10

INSPECTION BEFORE ENGINE OIL LEVEL CHECK ......................... 2-11

ENGINE OIL LEVEL INSPECTION ....................................................... 2-11

ENGINE OIL CHANGE .......................................................................... 2-12

ENGINE OIL FILTER CHANGE ............................................................ 2-13

OIL STRAINERS .......................................................................................... 2-14

INSPECTION ......................................................................................... 2-14

ENGINE COOLANT ..................................................................................... 2-15

ENGINE COOLANT LEVEL CHECK .................................................... 2-15

ENGINE COOLANT REPLENISHMENT ............................................... 2-16

COOLING SYSTEM INSPECTION ....................................................... 2-16

CLUTCH CABLE ......................................................................................... 2-17

MAJOR ADJUSTMENT ........................................................................ 2-17

MINOR ADJUSTMENT ......................................................................... 2-17

THROTTLE CABLE ..................................................................................... 2-18

THROTTLE CABLE ADJUSTMENT ..................................................... 2-18

THROTTLE CABLE LUBRICATION ..................................................... 2-18

HOT STARTER ............................................................................................ 2-19

ENGINE IDLE SPEED ................................................................................. 2-20

CRANKCASE BREATHER HOSE .............................................................. 2-20

FUEL HOSE ................................................................................................. 2-21

FUEL FILTER .............................................................................................. 2-21

VALVE CLEARANCE .................................................................................. 2-22

VALVE CLEARANCE ADJUSTMENT .................................................. 2-23

CYLINDER HEAD, CYLINDER AND PISTON ............................................ 2-26

CYLINDER HEAD INSPECTION .......................................................... 2-26

CYLINDER INSPECTION ...................................................................... 2-26

PISTON INSPECTION ........................................................................... 2-26

2

2-2 PERIODIC MAINTENANCE

PERIODIC MAINTENANCE

EXHAUST SILENCER ................................................................................ 2-27

SILENCER INSPECTION AND REPLACEMENT ................................ 2-27

DRIVE CHAIN AND SPROCKETS ............................................................. 2-28

DRIVE CHAIN SLACK .......................................................................... 2-28

DRIVE CHAIN ADJUSTMENT ............................................................. 2-28

20TH PITCH LENGTH .......................................................................... 2-28

DRIVE CHAIN LUBRICATION ............................................................. 2-29

SPROCKET INSPECTION ................................................................... 2-29

DRIVE CHAIN GUIDE, BUFFER AND CHAIN ROLLER ............................ 2-30

DRIVE CHAIN GUIDE INSPECTION .................................................... 2-30

DRIVE CHAIN BUFFER AND ROLLER INSPECTION ........................ 2-30

BRAKES ...................................................................................................... 2-31

BRAKE FLUID LEVEL ......................................................................... 2-31

BRAKE PAD ......................................................................................... 2-32

FRONT BRAKE LEVER ADJUSTMENT .............................................. 2-32

BRAKE PEDAL HEIGHT ADJUSTMENT ............................................ 2-32

FRONT FORK ............................................................................................. 2-33

REAR SUSPENSION .................................................................................. 2-33

WHEELS AND TIRES ................................................................................. 2-33

WHEEL RIM AND TIRES INSPECTION .............................................. 2-33

SPOKE NIPPLE AND RIM LOCK INSPECTION ................................. 2-34

TIRE PRESSURE ................................................................................. 2-34

STEERING .................................................................................................. 2-34

LUBRICATION ............................................................................................ 2-35

COMPRESSION PRESSURE CHECK ....................................................... 2-36

COMPRESSION TEST PROCEDURE ................................................. 2-36

OIL PRESSURE CHECK ............................................................................ 2-37

OIL PRESSURE CHECK PROCEDURE .............................................. 2-37

PERIODIC MAINTENANCE 2-3

PERIODIC MAINTENANCE

INSPECTION BEFORE PRACTICE

WHAT TO CHECK

Spark plug

Air cleaner element

Engine oil

Coolant

Cooling system

Clutch

Throttle

Crankcase breather hose

Engine idle speed

Brake fluid

Brakes

Drive chain

Drive chain guide/buffer

Suspension

Wheels

Tires

Steering

Exhaust pipe and muffler

Bolts and nuts

CHECK FOR

Heat range, fouled electrode, tightness

• Dust

• Lubrication

Oil level

Coolant level

• Radiator hose damage

• Engine coolant leak

• Play

• Smooth operation

• Play

• Smooth operation

Breather hose clogging and bend

Revolution speed

Fluid level

• Brake lever position

• Brake pedal height

• Operation

Slack, lubrication

Wear, damage

• Smooth operation

• Front fork air pressure

• Spoke tension

• Rim lock tightness or damage

Tire pressure

Smoothness, play

• Exhaust gas leakage

• Tightening torque

Tightening torque

2-4 PERIODIC MAINTENANCE

INSPECTION BEFORE RACE

(All items of inspection before practice on previous page plus)

WHAT TO CHECK

Clutch

Brake pads

Sprockets

Fuel tank

Fuel hose

Fuel filter

Exhaust pipe and muffler

Cylinder head

Piston and Cylinder

Air cleaner

CHECK FOR

Clutch disc plates wear and distortion

Wear

Wear Cleanliness

Leakage

• Damage

• Hoses are connected

Fuel filter clogging and damage

Damage

Combustion chamber carbon deposit

• Combustion chamber carbon deposit

• Piston head carbon deposit

• Piston and cylinder wear

• Damage

• Loose outlet tube

PERIODIC MAINTENANCE 2-5

PERIODIC MAINTENANCE CHART

It is very important to inspect and maintain the machine regularly. Follow the guideline in the chart. The life of parts varies depending on the riding conditions. Perform more often than shown in the chart if you use the motorcycle under severe conditions.

Interval

Service

Item

Spark plug

Air cleaner

Engine oil

Engine oil filter

Oil strainers races hours

Every race

Every

2 hours

—

Every

3 races

Every

6 hours

—

Every

6 races

Every

12 hours

—

Remarks

Replace air cleaner element as necessary.

Change after 1st initial break-in.

Cooling-system

I —

—

Replace radiator hose and engine coolant every year.

Flushing for overhaul or storage.

Replace clutch plates as necessary.

Clutch

Throttle cable and clutch cable

Hot starter

Carburetor

Crankcase breather hose

Fuel hose

Valve clearance

Piston

Piston ring

Cylinder head, cylinder

Muffler

Silencer

Drive chain

Engine sprocket

I & L

—

I & L

—

Replace intake pipe every 5 races (10 hours).

Replace every 4 years.

Adjust slack every 30 minutes.

Rear sprocket I — —

Check and retighten sprocket bolts at initial and subsequent 10 minutes of riding and each race thereafter.

Drive chain buffer and guide

Brake

Front fork oil

—

Front fork

Rear suspension I

I —

—

Replace brake hose and fluid every year.

Change after 1st initial break-in.

Check front fork inner tube frequently for abnormality. Check the air pressure.

Check rear suspension system frequently and apply the grease to the pivoting portion as necessary.

2-6 PERIODIC MAINTENANCE

Service

Item

Tire

Interval races hours

Every race

Every

2 hours

Every

3 races

Every

6 hours

—

Every

6 races

Every

12 hours

—

Remarks

Spoke nipple I — —

Inspect every 20 min. up to initial 2 hours then check before each ride.

Steering

Kick starter lever

Bolts and nuts

I & L

—

— Retighten every 1 hour.

NOTE: R = Replace, C = Clean, T = Tighten, I = Inspect and clean, adjust lubricate or replace if necessary,

L = Lubricate

SPARK PLUG

• Remove the seat. (

5-2)

• Remove the radiator covers and fuel tank. (

5-2)

• Disconnect the lead wire coupler from the ignition coil/plug cap.

CAUTION

Disconnect the lead wire coupler before removing the ignition coil/plug cap to avoid lead wire coupler damage.

• Remove the ignition coil/plug cap.

CAUTION

Do not pry up the ignition coil/plug cap with a screw driver or a bar to avoid its damage.

Be careful not to drop the ignition coil/plug cap to prevent short/open circuit.

• Remove the spark plug with a spark plug wrench.

NOTE:

Remove the dirt around the spark plug before removing the spark plug to prevent dirt from entering the combustion chamber.

09930-10121: Spark plug wrench set

• Inspect the spark plug condition, electrode color, carbon deposits, spark plug gap and insulator damage.

• If it is extremely worn or burnt, replace the spark plug.

Also, replace the spark plug if it has a broken insulator, damaged thread, etc.

• Inspect the porcelain tip color.

Porcelain tip color

White (overheated)

Black (fouled)

Cause

• Hot type spark plug

• Advanced ignition timing

• Lean air/fuel mixture

• Deteriorated fuel

• Cold type spark plug

• Retarded ignition timing

• Rich air/fuel mixture

PERIODIC MAINTENANCE 2-7

2-8 PERIODIC MAINTENANCE

• Check the spark plug gap A with a thickness gauge.

09900-20803: Thickness gauge

Spark plug gap: 0.9 – 1.0 mm (0.035 – 0.039 in)

Standard Spark plug

NGK CR8EIA-10

CAUTION

Changing the spark plug heat range improperly can damage the engine.

Select the spark plug heat range only after adjusting the carburetor setting.

• Tighten the spark plug with specified tightening torque after tightening the spark plug temporarily with fingers.

09930-10121: Spark plug wrench set

Spark plug: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Install the ignition coil/spark plug cap securely.

CAUTION

Do not hit the ignition coil/plug cap with a plastic hammer when installing it.

• Connect the lead wire coupler.

45 ± 10˚

INCORRECT

AIR CLEANER

AIR CLEANER ELEMENT REMOVAL

• Remove the left frame cover.

• Remove the wing nut 1 .

• Remove the element 2 from the element holder.

WASHING

• Fill a washing pan large enough to hold the element with a non-flammable cleaning solvent A . Immerse the element in the solvent and wash it.

: MOTUL AIR FILTER CLEAN or equivalent cleaning solvent

• Squeeze the element by grasping it to remove excess solvent. Do not twist or wring the element or it will develop cracks.

• Dry the element in a plastic bag, pour in some foam filter oil B and work the oil into the element.

: MOTUL AIR FILTER OIL or equivalent filter oil

• Squeeze the element to remove excess oil.

INSTALLATION

• Apply grease to the element base where it contacts the air cleaner box.

• Fit the element onto the element holder.

NOTE:

Fit the projection of the element holder

to the hole of the element base

• Install them in the air cleaner box by engaging the projection

D of the element holder with the hole E of the cleaner body.

CAUTION

Improper element installation allows dust and dirt to enter the combustion chamber. It can result in piston and cylinder wear.

Be sure to check the element seals properly after installing the element.

PERIODIC MAINTENANCE 2-9

2-10 PERIODIC MAINTENANCE

NOTE:

Follow the instructions below to keep the air cleaner element dry when cleaning the motorcycle.

• Cover the element with vinyl bag.

• Install the left frame cover.

• Cover the inlet hole on the frame cover in order to prevent water from coming into the air cleaner box.

• Do not spray high pressure water to the air cleaner box.

ENGINE OIL AND OIL FILTER

WARNING

Engine oil and exhaust pipes can be hot enough to burn you.

Wait until the oil drain plug and exhaust pipe are cool enough to touch with bare hands before draining oil.

WARNING

New and used oil and solvent can be hazardous. Children and pets may be harmed by swallowing new or used oil or solvent. Continuous contact with used engine oil has been found to cause skin cancer in laboratory animals. Brief contact with used oil or solvent may irritate skin.

* Keep new and used oil and solvent away from children and pets.

* Wear a long-sleeve shirt and waterproof gloves.

* Wash with soap if oil or solvent contacts your skin.

NOTE:

Recycle or properly dispose of used oil and solvent.

INSPECTION BEFORE ENGINE OIL LEVEL

CHECK

• Before starting the engine, check that there is sufficient oil for operating the engine.

CAUTION

If the engine is started with insufficient or no oil, the engine components will possibly be damaged.

NOTE:

The oil level measurement may become inaccurate unless the motorcycle is held upright as the motorcycle inclination affects the oil level.

• During inspection, hold the motorcycle in an upright position on a level surface.

• Remove the oil check bolt 1 . If, at this time, oil comes out from this bolt hole, proceed to “ENGINE OIL LEVEL INSPEC-

TION” below.

Oil check bolt: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

ENGINE OIL LEVEL INSPECTION

• During inspection, hold the motorcycle in an upright position on a level surface.

NOTE:

The oil level measurement may become inaccurate unless the motorcycle is held upright as the motorcycle inclination affects the oil level.

• Start and run the engine at idle for three minutes.

NOTE:

Do not run the engine at a speed higher than idling, otherwise the oil level to be inspected may be affected.

• Stop and leave the engine standstill for two minutes. Thereafter if oil flows out when the oil check bolt 1 is removed, the oil level is appropriate.

• If oil is excessive, let oil flows out of the oil level hole.

• If oil still does not come out, tighten the oil check bolt, remove the filler cap 2 and pour an adequate amount of recommended oil.

• Repeat the above-mentioned procedure.

• Tighten the oil check bolt.

Oil check bolt: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

PERIODIC MAINTENANCE 2-11

2-12 PERIODIC MAINTENANCE

ENGINE OIL CHANGE

• During inspection, hold the motorcycle in an upright position on a level surface.

• Warm up the engine.

• Remove the filler cap, TDC plug 1 , drain plug 2 and drain

No.2 plug 3 . Drain oil thoroughly.

• Replace the gasket washers with new ones and tighten their drain plugs.

Oil drain plug: 21 N·m (2.1 kgf-m, 15.0 lb-ft)

Oil drain No.2 plug: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

• Pour specified amount of motor oil.

SAE 10W-40, API SF/SG or SH/SJ with JASO MA

...............................................For E-03

MOTUL 300V 10W-40 (Recommendation oil) or

SAE 10W-40, API SF/SG or SH/SJ with JASO MA

...........................................The others

Oil change .......... 900 ml (1.0/0.8 US/Imp qt)

Filter change ...... 950 ml (1.0/0.8 US/Imp qt)

Overhaul............. 1 000 ml (1.1/0.9 US/Imp qt)

• Replace the O-ring with a new one and tighten the TDC plug 1 .

TDC plug: 14 N·m (1.4 kgf-m, 10.0 lb-ft)

• Tighten the filler cap.

• Run the engine for a few minutes and stop it. Wait a few minutes.

• Inspect the oil level.

ENGINE OIL FILTER CHANGE

• Drain the engine oil as described in the engine oil replacement procedure.

• Remove the oil filter cap 1 and spring 2 with oil filter 3 .

• Apply engine oil lightly to the gasket of the new oil filter before installation.

• Install the new oil filter.

CAUTION

Make sure that the oil filter installed properly. If the filter is installed improperly, serious engine damage may result.

• Apply engine oil lightly to the new O-ring.

CAUTION

Use a new O-ring to prevent oil leakage.

• Install the oil filter cap and tighten the bolts.

Oil filter cap bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Add new engine oil and check the oil level as described in the engine oil level inspection procedure.

Oil change .......... 900 ml (1.0/0.8 US/Imp qt)

Filter change ...... 950 ml (1.0/0.8 US/Imp qt)

Overhaul .............1 000 ml (1.1/0.9 US/Imp qt)

PERIODIC MAINTENANCE 2-13

2-14 PERIODIC MAINTENANCE

OIL STRAINERS

OIL STRAINER (Feed pump side) REMOVAL

• Drain engine oil. (

2-12)

• Remove the engine oil strainer cap.

CAUTION

Do not lie the motorcycle to prevent dirty engine oil into the oil circuit when removing the oil strainer

(Feed pump side).

• Pull out the oil strainer.

NOTE:

We recommend that inspect feed pump side oil strainer every race.

OIL STRAINER (Scavenge pump side)

REMOVAL

(

10-4)

INSPECTION

• Check the oil strainers for any damage or clogging.

• If the oil strainers are clogged, clean the oil strainers with a compressed air.

OIL STRAINER (Scavenge pump side)

INSTALLATION

(

10-15)

OIL STRAINER (Feed pump side)

INSTALLATION

• Install the oil strainer and then tighten the oil strainer cap to the specified torque.

CAUTION

Replace the gasket washer with a new one.

Engine oil strainer cap: 21 N·m (2.1 kgf-m, 15.0 lb-ft)

• Add new engine oil and check the oil level. (

2-11)

ENGINE COOLANT

ENGINE COOLANT LEVEL CHECK

WARNING

You can be injured by scalding fluid or steam if you open the radiator cap when the engine is hot.

Do not open the radiator cap when the engine is hot.

Wait until engine cools.

• Remove the radiator cap

• Check that the engine coolant level is at the bottom of the inlet hole. If not, replenish the radiator with specified engine coolant.

• Tighten the radiator cap securely.

CAUTION

Improperly tightening the radiator cap will prevent the cooling system from reaching the specified operating pressure and will cause coolant overflow.

Tighten the radiator cap until it locks firmly.

NOTE:

* This motorcycle does not have an overflow tank at the end of breather hose. Therefore, engine coolant level may decrease while riding. Check the engine coolant level every time before riding.

* When replenishing engine coolant, be sure to use engine coolant mixed with distilled water at the ratio of 50:50. Adding only water will dilute engine coolant and it may decrease cooling performance.

* If the motorcycle is to be exposed to temperatures below –31

°C (–24 °F), the percentage of antifreeze should be increased to 55% or 60%, according to figure 1.

Antifreeze density

50%

55%

60%

Freezing point

– 31 °C (– 24 °F)

– 40 °C (– 40 °F)

– 55 °C (– 67 °F)

PERIODIC MAINTENANCE 2-15

Density (%)

Fig. 1 Engine coolant density-freezing point

2-16 PERIODIC MAINTENANCE

ENGINE COOLANT REPLENISHMENT

• Use an anti-freeze and Summer engine coolant which is compatible with aluminum radiator, mixed with distilled water at the ratio of 50:50.

NOTE:

The radiator, cylinder and cylinder head are made of aluminum alloy. Using non-recommended engine coolant may corrode aluminum alloy and may clog the coolant passageways.

WARNING

Engine coolant is harmful if swallowed or if it comes in contact with your skin or eyes.

Keep engine coolant away from children and pets. Call your doctor immediately if engine coolant is swallowed and induce vomiting. Flush eyes or skin with water if engine coolant gets in eyes or comes in contact with skin.

COOLING SYSTEM INSPECTION

Inspect the following items before practice and races.

• Engine coolant leakage

• Radiator hose cracks and deterioration

• Radiator mounting condition

• Radiator over flow pipe condition

• Radiator fin condition

CLUTCH CABLE

Adjust the clutch cable play as follows:

MAJOR ADJUSTMENT

• Loosen the lock-nut

• Turn adjuster 2 so the clutch lever has 10 – 15 mm (0.4 – 0.6

in) play at the clutch lever end before pressure is felt.

• Tighten the lock-nut

1 to the specified torque.

Clutch lever play

: 10 – 15 mm (0.4 – 0.6 in)

Cable adjuster lock-nut: 2.2 N·m (0.22 kgf-m, 1.60 lb-ft)

MINOR ADJUSTMENT

• Turn adjuster 3 so the clutch lever has 10 – 15 mm (0.4 – 0.6

in) play at the clutch lever end before pressure is felt.

Clutch lever play A : 10 – 15 mm (0.4 – 0.6 in)

PERIODIC MAINTENANCE 2-17

2-18 PERIODIC MAINTENANCE

THROTTLE CABLE

WARNING

Inadequate throttle cable play can cause engine speed to rise suddenly when you turn the handlebars. This can lead to loss of rider control.

Adjust the throttle cable play so that engine speed does not rise due to handlebar movement.

Adjust the throttle cable play A as follows:

THROTTLE CABLE ADJUSTMENT

• Loosen the lock-nut

• Turn adjuster 2 so the throttle grip has 2 – 4 mm (0.08 – 0.16

in) play in circumference.

• Tighten the lock-nut

1 to the specified torque.

Throttle cable play

: 2 – 4 mm (0.08 – 0.16 in)

Cable adjuster lock-nut: 2.2 N·m (0.22 kgf-m, 1.60 lb-ft)

WARNING

After the adjustment is completed, check that handlebars movement does not raise the engine idle speed and that the throttle grip returns smoothly and automatically.

THROTTLE CABLE LUBRICATION

• Remove the throttle case 1 .

• Apply oil to the throttle cable.

• Apply SUZUKI SUPER GREASE to the throttle cable spool.

' 99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

HOT STARTER

Adjust the hot starter cable play A as follows:

• Loosen the lock-nut 1 .

• Turn adjuster 2 so the hot starter lever clearance A measured at the lever holder obtains approx. 3 mm (0.12 in) when squeezing the lever until pressure is felt.

• Tighten the lock-nut 1 to the specified torque.

Hot starter cable play A : Approx. 3 mm (0.12 in)

Cable adjuster lock-nut: 2.2 N·m (0.22 kgf-m, 1.60 lb-ft)

PERIODIC MAINTENANCE 2-19

• Check that the hot starter lever moves smoothly from full open to full close.

• If it does not move smoothly, lubricate the hot start cable.

2-20 PERIODIC MAINTENANCE

ENGINE IDLE SPEED

• Adjust the throttle cable play. (

2-18)

• Warm up the engine.

• Connect the multi-circuit tester to the primary lead wire

(W/Bl).

09900-25008: Multi-circuit tester set

• Start the engine, turn the throttle stop screw

and set the engine idle speed as follows.

Engine idle speed: 2 100 ± 50 r/min

CRANKCASE BREATHER HOSE

• Inspect the crankcase breather hose for damage, clogging and bend. If any defects are found, the breather hose must be replaced.

FUEL HOSE

• Inspect the fuel hose for damage and fuel leakage. If any defects are found, the fuel hose must be replaced.

• Replace the fuel hose every four years.

PERIODIC MAINTENANCE 2-21

FUEL FILTER

WARNING

Gasoline is highly flammable and explosive.

Keep heat, sparks and flames away from gasoline.

• Drain fuel from the fuel tank.

• Remove the seat and radiator covers. (

5-2)

• Turn the fuel valve to the OFF position.

• Disconnect the fuel hose

and remove the fuel tank.

(

5-2)

• Remove the fuel hose 1 and fuel valve 2 .

• If the fuel filter is dirty with sediment, fuel will not flow smoothly.

• Clean the fuel filter with compressed air.

CAUTION

The O-ring

must be replaced with a new one to prevent fuel leakage.

2-22 PERIODIC MAINTENANCE

VALVE CLEARANCE

• Remove the seat. (

5-2)

• Remove the radiator covers and fuel tank. (

5-2)

• Disconnect the ignition coil/plug cap. (

2-7)

• Remove the spark plug. (

2-7)

• Remove the cylinder head cover and its cylinder head cover gasket.

The valve clearance specification is different for both intake and exhaust valves.

Valve clearance adjustment must be checked and adjusted: 1) at the time of periodic maintenance, 2) when the valve mechanism is serviced, and 3) when the camshafts are removed for servicing.

NOTE:

* The piston must be at top dead center (TDC) on the compression stroke in order to check or adjust the valve clearance.

* The valve clearance should only be checked when the engine is cold.

• Remove the TDC plug

and crankshaft hole plug

• Place a wrench over the crankshaft and turn it counterclockwise to align the TDC mark A with the center of the grooves

B of the timing inspection hole.

NOTE:

The piston must be at TDC on the compression stroke. (

6-3)

• Insert a thickness gauge between the tappet and the cam. If the clearance is out of specification, adjust it to specification as follows.

• Place a wrench over the crankshaft and turn it counter-clockwise to align the TDC mark A with the center of the grooves

B of the timing inspection hole.

Valve clearance (when cold):

Standard: IN. : 0.09 – 0.16 mm (0.004 – 0.006 in)

EX. : 0.17 – 0.24 mm (0.006 – 0.009 in)

09900-20803: Thickness gauge

VALVE CLEARANCE ADJUSTMENT

The clearance is adjusted by replacing the existing tappet shim by a thicker or thinner shim.

• Remove the intake or exhaust camshafts. (

6-4)

• Remove the tappet 1 and shim 2 by fingers or magnetic hand.

• Check the figures printed on the shim. These figures indicate the thickness of the shim, as illustrated.

• Select a replacement shim that will provide a clearance within the specified range. For the purpose of this adjustment, tappet shim are available ranging from 1.200 to 2.200 mm in steps of 0.025 mm. Fit the selected shim to the valve stem end, with numbers toward tappet. Be sure to check shim size with micrometer to ensure its size. Refer to the tappet shim selection table (

2-24, -25) for details.

175

PERIODIC MAINTENANCE 2-23

1.75 mm

NOTE:

* Be sure to apply engine oil to tappet shim top and bottom faces.

* When seating the tappet shim, be sure the figure printed surface faces the tappet.

• Reinstall the camshafts in the specified manner. (

6-30)

• After replacing the tappet shim and camshafts, rotate the engine so that the tappet is depressed fully. This will squeeze out oil trapped between the shim and the tappet that could cause an incorrect measurement. Then check the clearance again to confirm that it is within the specified range.

• After finishing the valve clearance adjustment, reinstall the following items.

• Cylinder head cover (

6-33)

• Spark plug and ignition coil/plug cap (

2-8)

• Radiator covers, fuel tank and seat

• TDC plug and crankshaft hole plug (

6-32)

2-24 PERIODIC MAINTENANCE

(INTAKE SIDE)

(EXHAUST SIDE)

PERIODIC MAINTENANCE 2-25

2-26 PERIODIC MAINTENANCE

CYLINDER HEAD, CYLINDER AND

PISTON

CYLINDER HEAD INSPECTION

• Remove the cylinder head. (

6-4)

• Decarbonize the combustion chambers.

• Inspect for pinholes, cracks and other damage.

• If any defects are found, replace the cylinder head with a new one.

CYLINDER INSPECTION

• Remove the cylinder. (

6-5)

• Inspect the cylinder wall for any scratches, nicks or other damage.

• If any defects are found, replace the cylinder with a new one.

PISTON INSPECTION

• Remove the piston. (

6-6)

• Decarbonize the top surface of the piston.

• Remove carbon deposits from the piston ring groove.

• Check for scratches and cracks.

• Check piston ring wear.

• If any defects are found, replace the piston with a new one.

EXHAUST SILENCER

SILENCER INSPECTION AND

REPLACEMENT

• Remove the muffler. (

5-3)

• Remove the bands 1 and rivets using the 5.0 mm (0.20 in) drill.

NOTE:

Be careful not to damage the rear muffler body, tail pipe and inner plate.

• Remove the rear muffler body

and inner pipe assembly

3 from the muffler body.

PERIODIC MAINTENANCE 2-27

• Inspect the glass wool 4 for clogging with carbon deposit or tar.

• Replace the glass wool 4 with a new one if necessary.

• Apply the SUZUKI BOND to the circumference of the rear muffler body 2 .

(

99000-31140: SUZUKI BOND “1207B”

• Insert the and rear muffler body 2 and inner pipe assembly

3 to the muffler body.

• Install the bands and rivets.

• Install the muffler. (

5-8)

NOTE:

After installation, inspect the exhaust system leaks.

2-28 PERIODIC MAINTENANCE

DRIVE CHAIN AND SPROCKETS

DRIVE CHAIN SLACK

• Place the motorcycle on a block to lift the rear wheel off the ground.

• Inspect the drive chain slack at the middle point between the drive chain buffer and rear sprocket.

Drive chain slack: 35 – 45 mm (1.4 – 1.8 in)

35 – 45 mm (1.4 – 1.8 in)

DRIVE CHAIN ADJUSTMENT

• Loosen the axle nut

• Loosen the lock-nuts 2 and adjust the drive chain slack to the specification by turning the adjusters

. Make sure that the right and left adjuster plates

are at the same position on scales 5 .

• With the adjusters

held in position, tighten the lock-nuts

• Push the adjuster plates

to the adjusters

and tighten the axle nut 1 .

Axle nut: 90 N·m (9.0 kgf-m, 65.0 lb-ft)

• Tighten the lock-nut

20TH PITCH LENGTH

Pull the drive chain tight and measure the 20th pitch length.

Drive chain 20th pitch length

Service limit: 323.8 mm (12.75 in)

PERIODIC MAINTENANCE 2-29

DRIVE CHAIN LUBRICATION

• Remove the chain clip and master link from the drive chain and remove the drive chain.

NOTE:

Be careful not to bend the chain clip.

• Inspect for wear and damage of the drive chain and replace it if necessary.

• Clean the drive chain with non-flammable cleaning solvent.

CAUTION

Do not use gasoline to clean the drive chain.

• Dry the drive chain.

• Apply Suzuki Chain Lube or equivalent to the link plates and rollers.

• Reassemble the drive chain.

NOTE:

Reassemble the drive chain clip so the slit end faces opposite the direction of rotation.

• Adjust the drive chain slack. (

2-28)

Direction of travel

SPROCKET INSPECTION

Inspect the engine sprocket and rear sprocket for wear and cracks. Replace the sprockets as necessary.

NOTE:

When replacing a worn sprocket, it is likely that the drive chain will need to be replaced as well.

Normal wear Excessive wear

2-30 PERIODIC MAINTENANCE

DRIVE CHAIN GUIDE, BUFFER AND

CHAIN ROLLER

DRIVE CHAIN GUIDE INSPECTION

• Inspect the drive chain guide 1 for bends and damage.

NOTE:

The drive chain can hit a bent guide causing noise and drive chain wear.

• Inspect the chain guide defense 2 for wear.

• Replace the defective parts with a new one if necessary.

DRIVE CHAIN BUFFER AND ROLLER

INSPECTION

• Inspect the drive chain buffer

for wear and cracks.

• Inspect the chain rollers

for wear.

• Replace the defective parts with a new one if necessary.

NOTE:

The drive chain can touch the swingarm directly if the chain guide buffer is worn out. This will cause drive chain and swingarm damage.

• Inspect the chain roller bolt and nut for tightness.

Chain roller bolt/nut: 22 N·m (2.2 kgf-m, 16.0 lb-ft)

BRAKES

BRAKE FLUID LEVEL

• Inspect the brake fluid level in both front and rear reservoirs. If the brake fluid level is lower than LOWER mark A , replenish the reservoir with the specified brake fluid to the UPPER line.

(

16-3)

Inspect brake pad wear and brake fluid leakage if the brake fluid level decreases.

)

Brake fluid: DOT 4

WARNING

Brake fluid can be hazardous to humans and pets.

Brake fluid is harmful or fatal if swallowed, and harmful if it comes in contact with your skin or eyes.

Keep brake fluid away from children. Call your doctor immediately if brake fluid is swallowed, and induce vomiting. Flush eyes or skin with water if brake fluid gets in eyes or comes in contact with skin.

WARNING

The use of any fluid except DOT 4 brake fluid from a sealed container can damage the brake system and lead to an accident.

Use only DOT 4 brake fluid from a sealed container.

Never use or mix different types of brake fluid.

CAUTION

Spilled brake fluid can damage painted surfaces and plastic parts.

Be careful not to spill any fluid when filling the brake fluid reservoir. Wipe spilled fluid up immediately.

PERIODIC MAINTENANCE 2-31

2-32 PERIODIC MAINTENANCE

BRAKE PAD

• Inspect the brake pads for wear. If the brake pads are worn, replace them with new ones. (

16-5)

NOTE:

* Pump the brake lever and pedal several times to restore the brake pads after replacing the brake pads.

* Replace both right and left pads together when replacing the brake pads.

FRONT BRAKE LEVER ADJUSTMENT

Adjust the brake lever position as follows:

• Loosen the lock-nut 1 .

• Turn in or out adjuster 2 to obtain the proper brake lever position.

• The standard adjuster length A is from 11 – 15 mm (0.4 – 0.6 in).

• Tighten the lock-nut 1 .

Brake lever adjuster length A :

11 – 15 mm (0.4 – 0.6 in)

BRAKE PEDAL HEIGHT ADJUSTMENT

Adjust the rear brake pedal height as follows:

• Loosen the lock-nut 1 .

• Adjust the brake pedal height A by turning the adjuster 2 to locate the pedal 0 – 10 mm (0 – 0.39 in) below the top face of the footrest.

• Tighten the lock-nut 1 .

Brake pedal height A : 0 – 10 mm (0 – 0.39 in)

Master cylinder rod lock-nut: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

Wear limit

FRONT FORK

• Move the front fork up and down several times and inspect for smooth movement.

• Inspect for damage and oil leaks.

• Inspect the bolts and nuts for tightness.

• If any defects are found, replace the front fork with a new one.

• Place a stand under the chassis tube to lift the front wheel off the ground.

• Remove the air bleed screw and equalize the air pressure in the front forks to atmospheric pressure.

• Refit the air bleed screw.

PERIODIC MAINTENANCE 2-33

REAR SUSPENSION

• Move the rear suspension up and down several times and inspect for smooth movement.

• Inspect for damage and oil leaks.

• Inspect the bolts and nuts for tightness.

• Inspect that the rear suspension has play or binds by moving the swingarm up and down, and right and left.

• Replace the defective parts with a new one if necessary.

WHEELS AND TIRES

WHEEL RIM AND TIRES INSPECTION

• Inspect the wheel and tires for damage.

• Inspect the wheel bearing for rattles. (

15-4)

• Inspect the wheel rim runout. (

15-4)

• Replace the defective parts with a new one if necessary.

2-34 PERIODIC MAINTENANCE

SPOKE NIPPLE AND RIM LOCK

INSPECTION

• Inspect the spokes for tension by squeezing the spoke nipples.

• Retighten the spoke nipples with a spoke nipple wrench so as all spokes have same tension.

Spoke nipple: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

CAUTION

Improperly tightening the spoke nipples can damage the wheel.

Tighten the spoke nipples less than 1/2 turn at a time.

Inspect the spoke tension and then retighten the spoke nipple.

• Inspect the rim lock

for tightness.

TIRE PRESSURE

• Inspect front and rear tire pressure.

Tire pressure (cold): 70 – 110 kPa

(0.7 – 1.1 kgf/cm 2 , 10 – 16 psi)

STEERING

• Inspect the steering by moving the front fork up and down, and back and forward. If the steering has play or binds, inspect steering stem head nut tightness and steering bearings. (

17-20)

PERIODIC MAINTENANCE 2-35

LUBRICATION

Apply grease or oil to the moving parts to increase durability and prevent wear.

No.

ITEM

Clutch inner cable, lever

Hot starter inner cable, lever

Throttle grip, throttle housing, cable

Rear brake pedal

Swingarm

LUBRICANT

FREQUENCY

Pre-race and between every race

Pre-race

Run oil through cables until it exits the lower end. Lube the cable ends where they pivot.

COMMENTS

Lightly grease the inside of throttle spool. Keep free from dirt.

Grease the brake pedal pivot.

Rear suspension linkage pivot points

Steering stem bearings

7 Kick starter lever

8 Starter shaft

Drive chain

Every 3 races/More often according to conditions

Every 1 race/More often according to conditions

Every 5 races/More often according to conditions

Pre-race

Pre-race and between every race

Clean and pack the bearings.

Keep seals fresh.

Grease the seals.

Clean and pack the bearings.

Keep seals fresh.

Grease the seals.

Clean and pack the bearings.

Keep seals fresh.

Grease the kick starter lever pivot.

Lightly oil the plunger shaft.

Keep chain thoroughly lobed at all times. Always check wear and alignment.

Grease the seals.

Cushion lever dust seals

Front and rear wheels

Pre-race

Pre-race Grease the bearing and seals.

The following materials are necessary:

A. Lightweight oil such as WD-40 or penetrating oil

B. Aerosol type Chain Lube

C. SUZUKI SUPER GREASE “A” (or equivalent grease) or Water-proof wheel bearing grease

Follow the schedule closely. The disassembly necessary to lubricate many components is in itself valuable preventative maintenance. It allows you to inspect for wear, fatigue, adjustment and fastener tightness and it allows you to clean out the grit which otherwise cannot be gotten out.

2-36 PERIODIC MAINTENANCE

COMPRESSION PRESSURE CHECK

The compression pressure reading of a cylinder is a good indicator of its internal condition.

The decision to replace the cylinder is often based on the results of a compression test.

COMPRESSION PRESSURE SPECIFICATION (Automatic decomp. actuated)

Standard

400 – 800 kPa

(4.0 – 8.0 kgf/cm 2 , 57 – 114 psi)

Low compression pressure can indicate any of the following conditions:

* Excessively worn cylinder walls

* Worn piston or piston rings

* Piston rings stuck in grooves

* Poor valve seating

* Valve clearance out of adjustment

* Ruptured or otherwise defective cylinder head gasket

* Decomp. trouble

COMPRESSION TEST PROCEDURE

NOTE:

* Before testing the engine for compression pressure, make sure that the cylinder head nuts are tightened to the specified torque values and the valves are properly adjusted.

* Warm up the engine before testing.

Remove the related parts and test the compression pressure in the following manner:

• Remove the seat. (

5-2)

• Remove the fuel tank. (

5-2)

• Remove the spark plug. (

2-7)

• Install the compression gauge and adaptor in the spark plug hole. Make sure that the connection is tight.

• Keep the throttle grip in the fully opened position.

• Kick energetically the kick starter lever about 5 times to turn the engine.

• Record the maximum gauge reading as the cylinder compression.

09913-10750: Compression gauge adaptor

09915-64512: Compression gauge

• Reinstall the removed parts.

PERIODIC MAINTENANCE 2-37

OIL PRESSURE CHECK

Check the oil pressure periodically. This will give a good indication of the condition of the moving parts.

Oil pressure:

20 kPa (0.2 kgf/cm², 2.8 psi) at 6 000 r/min, oil temp. at 50 °C (122 °F)

Low or high oil pressure can indicate any of the following conditions:

LOW OIL PRESSURE

* Clogged oil filter

* Oil leakage from the oil passage

* Damaged oil seal

* Defective oil pump

* Combination of the above items

HIGH OIL PRESSURE

* Engine oil viscosity is too high

* Clogged oil passage

* Combination of the above items

OIL PRESSURE CHECK PROCEDURE

• Connect the multi-circuit tester to the primary lead wire

(W/Bl).

09900-25008: Multi-circuit tester set

• Remove the main oil gallery plug

• Install the oil pressure gauge and adaptor into the main oil gallery.

• Warm up the engine.

• After warming up the engine, increase the engine speed to

6 000 r/min (observe the tachometer), and read the oil pressure gauge.

WARNING

Do not remove the oil pressure gauge adapter when the engine is hot. Wait until engine cools.

• Install the oil gallery plug 1 .

Oil gallery plug: 4,5 N·m (0.45 kgf-m, 3,25 lb-ft)

09915-74511: Oil pressure gauge

09940-40211: Adaptor

– MEMO –

TROUBLESHOOTING 3-1

TROUBLESHOOTING

ENGINE ........................................................................................................ 3- 2

CARBURETOR ............................................................................................ 3- 6

RADIATOR (COOLING SYSTEM) .............................................................. 3- 6

CHASSIS ..................................................................................................... 3- 7

BRAKES ...................................................................................................... 3- 8

ELECTRICAL ............................................................................................... 3- 9

3-2 TROUBLESHOOTING

ENGINE

Complaint

Engine will not start or is hard to start.

Symptom and possible causes

Compression too low

• Valve clearance out of adjustment

• Worn valve guides or poor seating of valves

• Mistiming valves

• Excessively worn piston ring

• Worn-down cylinder bore

• Poor seating of spark plug

• Broken, cracked, or damaged piston

• Defective automatic decomp.

Plug not sparking

• Fouled spark plug

• Wet spark plug

• Incorrect spark plug gap

• Defective ignition coil/plug cap

• Defective CDI unit

• Open-circuited wiring connections

• Defective magneto

No fuel reaching the carburetor

• Clogged fuel tank vent hose

• Clogged or defective fuel valve

• Clogged fuel hose

• Defective carburetor float valve

Engine idles poorly.

• Valve clearance out of adjustment

• Valve timing out of adjustment

• Poor seating of valves

• Worn valve guide

• Worn down camshafts

• Incorrect spark plug gap

• Defective ignition coil/plug cap

• Defective CDI unit

• Defective magneto

• Defective throttle position sensor

• Sucking air from intake pipe

• Insufficient throttle cable play

Engine stalls often.

• Dirty spark plug

• Defective ignition system

• Clogged fuel hose

• Valve clearance out of adjustment

Remedy

Adjust

Repair or replace

Adjust

Replace

Retighten

Replace

Clean or replace

Replace

Clean and dry

Adjust

Replace

Repair or replace

Replace

Clean or replace

Adjust

Repair or replace

Replace

Adjust

Replace

Adjust or replace

Retighten or replace

Adjust

Replace

Clean

Adjust

TROUBLESHOOTING 3-3

Complaint

Noisy engine

Symptom and possible causes

Excessive valve chatter

• Too large valve clearance

• Weakened or broken valve springs

• Worn tappet or cam surface

• Worn and burnt camshaft journal

Noise seems to come from piston

• Worn down piston or cylinder

• Combustion chambers fouled with carbon

• Worn piston pin or piston pin bore

• Worn piston ring or ring groove

Noise seems to come from timing chain

• Stretched cam chain

• Worn sprockets

Adjust

Replace

Clean

Replace

Remedy

Noise seems to come from clutch

• Worn splines of countershaft or clutch sleeve hub

• Worn teeth of clutch plates

• Distorted clutch plates, driven and drive

• Worn clutch release bearing

Noise seems to come from crankshaft

• Rattling bearings due to wear

• Worn and burnt big-end bearing

• Worn and burnt journal bearings

Replace

Noise seems to come from transmission

• Worn or rubbing gears

• Worn splines

• Worn bearings

Replace

Engine runs poorly in high speed range.

Noise seems to come from water pump

• Worn or damaged impeller shaft

• Worn or damaged oil seal

• Contact between pump case and impeller

Defective engine internal/electrical parts

• Weakened valve springs

• Worn down camshafts

• Valve timing out of adjustment

• Incorrect spark plug gap

• Ignition not advanced sufficiently due to poorly working timing advance system (Pick-up coil, throttle position sensor and CDI unit)

• Defective ignition coil/plug cap

• Defective magneto

• Clogged air cleaner element

• Clogged fuel hose, resulting in inadequate fuel supply to carburetor

• Clogged fuel tank vent hose

Replace

Adjust

Replace

Clean

Clean and replace

3-4 TROUBLESHOOTING

Complaint Symptom and possible causes

Engine lacks power. Defective engine internal parts

• Loss of valve clearance

• Weakened valve springs

• Valve timing out of adjustment

• Worn piston ring or cylinder

• Poor seating of valves

• Fouled spark plug

• Incorrect spark plug

• Too much engine oil

Engine overheats

Other factors

• Defective carburetor

• Sucking air from intake pipe

• Clogged air cleaner element

• Clogged muffler

Defective engine internal parts

• Heavy carbon deposit on piston crowns

• Not enough oil in the engine

• Defective oil pump or clogged oil circuit

• Sucking air from intake pipe

• Use incorrect engine oil

Dirty or heavy exhaust smoke

Adjust

Replace

Adjust

Replace

Repair

Replace

Remedy

Drain out excess oil

See carburetor section

Retighten or replace

Clean or replace

Clean

Add oil

Replace or clean

Retighten or replace

Change

Other factors

• Mixture too rean

• Ignition timing is too advanced due to defective timing advance system (Pick-up coil, throttle position sensor and CDI unit)

• Defective cooling system

• Drive chain is too tight

• Too much engine oil in the engine

• Worn piston ring or cylinder

• Worn valve guides

• Scored or scuffed cylinder wall

• Worn valves stems

• Defective stem seals

• Worn oil ring side rails

Carburetor tuning

Replace

See radiator section

Adjust

Drain out excess oil

Replace

TROUBLESHOOTING 3-5

Complaint

Slipping clutch

Dragging clutch

Transmission will not shift.

Transmission will not shift back.

Transmission jumps out of gear.

Symptom and possible causes

• Weakened clutch springs

• Worn or distorted pressure plate

• Worn or distorted clutch plates

• Insufficient clutch cable play

• Some clutch spring weakened while others are not

• Distorted pressure plate or clutch plates

• Broken gearshift cam

• Distorted gearshift forks

• Worn gearshift pawl

• Broken return spring on shift shaft

• Rubbing or stickily shift shaft

• Distorted or worn gearshift forks

• Worn shifting gears on driveshaft or countershaft

• Distorted or worn gearshift forks

• Weakened stopper spring on gearshift stopper

• Worn gearshift cam plate

Remedy

Replace

Adjust

Replace

Repair or replace

Replace

3-6 TROUBLESHOOTING

CARBURETOR

Complaint Symptom and possible causes

Starting difficulty.

• Improperly working starter knob

• Improperly working hot starter lever

• Clogged starter jet passage

• Maladjusted pilot screw

• Maladjusted throttle stop screw

• Clogged slow jet or air passage

• Sucking air from intake pipe

Idling or low-speed trouble

• Maladjusted pilot screw

• Clogged slow jet or air passage

• Clogged main nozzle or air passage

• Sucking air from intake pipe

Medium or highspeed trouble

Overflow and fuel level fluctuations

• Clogged main jet

• Worn down jet float or main nozzle

• Clogged main nozzle or air passage

• Improperly working throttle valve

• Worn or damaged float valve

• Foreign matter on the float valve

• Broken float valve spring

• Improperly working float

• Incorrect float chamber fuel level

RADIATOR (COOLING SYSTEM)

Complaint

Engine overheats

Symptom and possible causes

• Not enough engine coolant

• Radiator core clogged with dirt or scale

• Clogged water passage

• Air trapped in the cooling circuit

• Defective water pump

• Use incorrect coolant

Remedy

—

Clean

Adjust

Clean or replace

Retighten or replace

Adjust

Clean or replace

Retighten or replace

Clean or replace

Adjust

Replace

Clean or replace

Replace

Adjust or replace

Adjust float height

Remedy

Add coolant

Clean

Bleed air

Replace

TROUBLESHOOTING 3-7

CHASSIS

Complaint Symptom and possible causes

Heavy steering • Overtightened steering stem nut

• Broken bearing in steering stem

• Distorted steering stem

• Not enough pressure in tires

Wobbly handlebars • Loss of balance between right and left front forks

• Distorted front fork

• Distorted front axle or crooked tire

• Loose steering stem nut

• Worn or incorrect tire or wrong tire pressure

• Worn bearing/race in steering stem

Wobbly front wheel • Distorted wheel rim

• Worn front wheel bearings

• Defective or incorrect tire

• Loose axle or axle pinch bolt

• Incorrect front fork oil level

• Loose spork nipple

Front suspension too soft

Front suspension too stiff

• Weakened springs

• Not enough fork oil

• Wrong weight fork oil

• Improperly set front fork damping force adjuster

• Too viscous fork oil

• Too much fork oil

• Bent front fork

• Improperly set front fork damping force adjuster

Noisy front suspension

Wobbly rear wheel • Distorted wheel rim

• Worn rear wheel bearings or swingarm bearings

• Defective or incorrect tire

• Worn swingarm and rear suspension bearings

• Loose nuts or bolts on rear suspensions

Rear suspension too soft

• Not enough fork oil

• Loose bolts on suspension

• Broken spring

Rear suspension too stiff

Noisy rear suspension

• Weakened spring of shock absorber

• Improperly set shock absorber spring force adjuster

• Leakage of oil or gas shock absorber

• Improperly set shock absorber damping force adjuster

• Bent shock absorber shaft

• Improperly set shock absorber spring force adjuster

• Bent swingarm pivot shaft

• Worn swingarm and rear suspension bearings

• Improperly set shock absorber damping force adjuster

• Loose nuts or bolts on rear suspension

• Worn swingarm and suspension bearings

Remedy

Adjust

Replace

Adjust

Repair or replace

Replace

Adjust

Adjust or replace

Replace

Retighten

Adjust

Retighten

Replace

Replenish

Replace

Adjust

Replace

Drain excess oil

Replace

Adjust

Replenish

Retighten

Replace

Retighten

Replace

Adjust

Repair or replace

Adjust

Replace

Adjust

Replace

Adjust

Retighten

Replace

3-8 TROUBLESHOOTING

BRAKES

Complaint

Insufficient brake power

Brake squeaking

Excessive brake lever stroke

Leakage of brake fluid

Brake drags

Symptom and possible causes

• Leakage of brake fluid from hydraulic system

• Worn pads

• Oil adhesion of engaging surface of pads

• Worn disc

• Air in hydraulic system

• Not enough brake fluid in the reservoir

• Carbon adhesion on pad surface

• Tilted pads

• Worn pads

• Damaged wheel bearings

• Loosen front wheel axle or rear wheel axle

• Foreign material in brake fluid

• Clogged return port of master cylinder

• Air in hydraulic system

• Insufficient brake fluid

• Improper quality of brake fluid

• Insufficient tightening of connection joints

• Cracked brake hose

• Worn piston or seal

• Worn cylinder or cup

• Rusty part

• Insufficient brake lever or brake pedal pivot lubrication

Remedy

Repair or replace

Replace

Clean disc and pads

Replace

Bleed air

Replenish

Repair surface with sandpaper

Correct pad fitting or replace

Replace

Tighten to specified torque

Replace brake fluid

Disassemble and clean master cylinder

Bleed air

Replenish fluid to specified level; bleed air

Replace with correct fluid

Tighten to specified torque

Replace

Replace piston or seal

Replace cylinder or cup

Clean and lubricate

Lubricate

TROUBLESHOOTING 3-9

ELECTRICAL

Complaint

No sparking or poor sparking

Spark plug soon become fouled with carbon.

Spark plug become fouled too soon.

Spark plug electrodes overheat or burn

Magneto does not charge.

Symptom and possible causes

• Defective ignition coil/plug cap

• Defective spark plug

• Defective CDI unit

• Defective magneto

• Open-circuited wiring connections

• Mixture too rich

• Idling speed set too high

• Incorrect gasoline

• Dirty air cleaner element

• Too cold spark plug

• Worn piston ring

• Worn piston or cylinder

• Excessive clearance of valve stems in valve guides

• Worn stem seals

• Too hot spark plug

• Overheated the engine

• Loose spark plug

• Too lean mixture

• Open- or short-circuited lead wires, or loose lead connections

• Short-circuited, grounded or open stator coil

Remedy

Replace

Check and repair

Carburetor tuning

Adjust throttle stop screw

Change

Replace

Replace with hot type plug

Replace

Replace with cold type plug

Tune up

Retighten

Carburetor tuning

Repair or replace

Replace

– MEMO –

MACHINE TUNING 4-1

MACHINE TUNING

CARBURETOR TUNING ............................................................................. 4- 2

PRINCIPLES OF CARBURETOR TUNING .......................................... 4- 2

SLOW SYSTEM .................................................................................... 4- 3

MAIN SYSTEM ...................................................................................... 4- 5

INTERMEDIATE SYSTEM .................................................................... 4- 5

CARBURETOR TUNING IN PRACTICE ............................................... 4- 7

FRONT FORK TUNING ............................................................................... 4-10

COMPRESSION DAMPING FORCE ADJUSTMENT ........................... 4-10

REBOUND DAMPING FORCE ADJUSTMENT .................................... 4-10

OIL QUANTITY MINOR ADJUSTMENT ............................................... 4-11

OIL CHANGE (Only for outer tube oil chamber) ............................... 4-12

SPRING CHANGE ................................................................................. 4-14

FRONT FORK TUNING PROCEDURE ................................................. 4-16

REAR SUSPENSION TUNING .................................................................... 4-17

COMPRESSION DAMPING FORCE ADJUSTMENT ........................... 4-17

REBOUND DAMPING FORCE ADJUSTMENT .................................... 4-18

SPRING PRE-LOAD ADJUSTMENT .................................................... 4-18

REAR SUSPENSION TUNING PROCEDURE ..................................... 4-19

SUSPENSION BALANCE ........................................................................... 4-21

BALANCE TEST ................................................................................... 4-21

BALANCING TIPS ................................................................................ 4-21

4

4-2 MACHINE TUNING

CARBURETOR TUNING

The carburetion of your motorcycle is carefully selected after extensive testing. You will find that the carburetion will function smoothly under many varied operating conditions. For best results we recommend that the adjustments and carburetion jetting be left “as is” from the factory.

Some riders may operate their motorcycle under extreme operating conditions such as; very high altitudes or extreme cold and hot temperatures. In these circumstances the jetting of the carburetor or other adjustments may need to be altered slightly. Riders who are not familiar with the operation and jetting procedures of the KEIHIN carburetor should have their local authorized Suzuki dealer perform these alterations.

Mechanically experienced riders can alter the carburetor settings based on the following information and specifications.

PRINCIPLES OF CARBURETOR TUNING

CARBURETOR COMPONENTS AND FUNCTIONS

The carburetor consists of a number of parts as shown below. The asterisk (*) marked parts are precisely machined, which meter the intake air (oxygen) and fuel so that the air/fuel mixture ratio is controlled accurately. They can be divided by three operation-related groups; slow system, intermediate system and main system, and they achieve their functions in each corresponding throttle opening range. It is necessary to have a full understanding of them for proper carburetor tuning.

CARBURETOR SPECIFICATIONS

1 * Main jet (M.J.) #170

2 * Slow jet (S.J.) #45

3 * Jet needle (J.N.) NLCT-4th

4 Starter jet #75

5 Slow air jet (S.A.J.) #100

6 Leak jet

7 * Pilot screw

#40

1 and 1/2 turns back

Throttle stop screw

9 Float height

Adjust to the specified idle speed.

8 mm (0.31 in)

Setting parts

Main jet #165

Main jet #175

Jet needle NLDT

Parts No.

09491-33009

09491-35009

13383-10H50

MACHINE TUNING 4-3

As shown below, each of the asterisk (*) marked parts is located between the air/fuel passage and has its own air/fuel mixture adjustable range in terms of the throttle valve opening. The chart indicates that the carburetor can supply correct air/fuel mixture to the engine in any range because of the overlapping adjustable range of the each part.

THROTTLE VALVE OPENING TUNING PARTS

MAIN JET (M.J.)

JET NEEDLE (J.N.) CLIP POSITION

JET NEEDLE (J.N.) O.D.

SLOW JET (S.J.) AND PILOT SCREW

THROTTLE OPENING 1/4

1 SLOW SYSTEM 2 INTERMEDIATE SYSTEM 3 MAIN SYSTEM

1/2 3/4

When performing carburetor tuning, first find out in what throttle opening range an improper air/fuel mixture is supplied, by checking the color of exhaust smoke, spark plug, throttle response, power, etc. Second, replace or adjust the part(s) related to the throttle opening range by referring to the following instructions.

The sizes referred to in the illustrations are those of standard setting.

SLOW SYSTEM

SLOW JET (S.J.)

The slow jet meters the fuel supplied to the slow system. Each jet size is indicated by a number. Larger number means a larger bore diameter and fitting a larger numbered slow jet enriches the air/fuel mixture.

Air/fuel mixture

Lean

SIZE P/NO.

Rich

#35

#40

#42

#45

#48

#50

#52

#55

#58

#60

09492-35019

09492-40022

09492-42019

09492-45032

09492-48013

09492-50023

09492-52011

09492-55017

09492-58001

09492-60016

4-4 MACHINE TUNING

PILOT SCREW (P.S.)

The pilot screw controls volume of the air/fuel mixture in slow range. Pilot screw specifications indicate the number of turns back from the lightly seated position.

Air/fuel mixture

Lean

Rich

Pilot screw turn back

3/4 turn back

1 turn back

1 and 1/4 turns back

1 and 1/2 turns back

1 and 3/4 turns back

2 turns back

2 and 1/4 turns back

THROTTLE STOP SCREW

The throttle stop screw determines the full closed position of the throttle valve.

• Turn it clockwise to raise the throttle valve.

• Turn it counterclockwise to lower the throttle valve.

CAUTION

Too high an engine idle may cause driveability failure such as lack of engine braking and poor deceleration during brake application.

ENGINE IDLE SPEED ...............................

2-20

MACHINE TUNING 4-5

MAIN SYSTEM

MAIN JET (M.J.)

The main jet, like the slow jet, meters fuel flow. Each jet size is indicated by a number. Larger number means a larger bore diameter and fitting a larger number main jet enriches the air/fuel mixture.

Air/fuel mixture

Lean

SIZE

Rich

#150

#152

#155

#158

#160

#162

* #165

#168

#170

#172

* #175

#178

#180

#185

#190

* Included alternated parts

P/NO.

09491-30018

09491-30019

09491-31012

09491-31013

09491-32010

09491-32011

09491-33009

09491-33010

09491-34010

09491-34011

09491-35009

09491-35010

09491-36008

09491-37008

09491-38011

INTERMEDIATE SYSTEM

JET NEEDLE (J.N.)

The jet needle is linked to the throttle valve by means of the needle clip. Its lower part is tapered and it has seven grooves cut in the upper part where the needle clip fits.

O.D. of Needle

Tap ere d p ort ion

Clip

4-6 MACHINE TUNING

Jet needle clip position

To adjust the air/fuel mixture with the jet needle, change position of the needle clip which is set in the 4th groove. The lower groove the clip is moved to, the higher the jet needle rises and the larger the clearance with the main nozzle becomes, resulting in a richer air/fuel mixture ratio.

Air/fuel mixture Needle type and clip position

Lean NLDT-1st

NLCT-1st

NLDT-2nd

NLCT-2nd

NLDT-3rd

NLCT-3rd

NLDT-4th

Rich

NLCT-4th

NLDT-5th

NLCT-5th

NLDT-6th

NLCT-6th

NLDT-7th

NLCT-7th

Needle number

NLCT

O.D.

Changing the needle itself controls air/fuel mixture ratio particularly on lower mid-throttle opening. The smaller the O.D., the richer the air/fuel mixture becomes.

Air/fuel mixture Needle Number

Lean NLDV

NLCV

NLDU

NLCU

* NLDT

NLCT

NLDS

Rich

NLCS

NLDR

NLCR

* Included alternated parts

Part No.

13383-10H90

13383-10H80

13383-10H70

13383-10H60

13383-10H50

13383-10H40

13383-10H30

13383-10H20

13383-10H10

13383-10H00

O.D.

2.795

2.785

2.775

2.765

2.755

Lean

Rich

MACHINE TUNING 4-7

CARBURETOR TUNING IN PRACTICE

In the previous section, basic principles of carburetor tuning have been discussed. Described in this section are the bases for carburetor tuning required when coping with variations in air (oxygen) concentration.

VARIATION IN AIR (OXYGEN) CONCENTRATION AND CARBURETOR CONDITIONS

As the air, affected by the temperature, altitude and humidity, gets expanded or compressed, air (oxygen) concentration varies accordingly. Each of these three factors affects the air in different ways, and the following graphs show their effects respectively in terms of the oxygen concentration.

[%]

100

-10

40 [˚C]

110 [˚F]

ATOMOSPHERIC TEMPERATURE

500 1000 1500 2000 2500[m]

1600 3200 5000 6500 8200 [ft]

ALTITUDE

20 40 60 80 100 [%]

HUMIDITY

In the above graphs, oxygen concentration is graduated on the vertical axis while the temperature, altitude and humidity are on the horizontal axis respectively. Oxygen concentration is set 100% under the conditions of 20 °C (68 °F), 0 m (0 ft) and 50% humidity. The standard carburetor setting is chosen to obtain the best engine performance under these conditions.

The graph at the left shows that the oxygen concentration changes about 10% in the 0 °C (32 °F) to 40 °C

(104 °F) temperature difference, the one in the center shows about 20% change in the 0 to 2 000 m (6 562 ft) altitude difference and the one at the right shows about 5% change in the 0 to 100% humidity difference.

As for humidity, its normal range is from 20 to 95%. Therefore the possible effect of humidity on the oxygen concentration is so little that it can be disregarded. Consequently, we can say that the oxygen concentration varies by as much as 20% depending on the temperature and altitude under normal riding conditions. On the other hand, different from the air, the fuel hardly changes in volume even when such environmental conditions change. Therefore, increase in oxygen concentration will make the air/fuel mixture richer and decrease will make it lean.

As the carburetor mixes gasoline and air, which are metered by each jet in varying proportions to suit throttle opening, the air/fuel mixture is affected if the air concentration itself varies as described above. Then proper engine power output can not be attained and, should the mixture become too lean, a piston seizure may result. To compensate for such change in the air concentration, it is required to carry out carburetor tuning beforehand. This requirement applies to all models of motorcycles and ATVs if they are used in areas where temperature and altitude range widely. The next section describes the procedure of the above tuning in detail.

4-8 MACHINE TUNING

JUDGING AIR/FUEL MIXTURE

For proper carburetor tuning, it is necessary to know how to judge the air/fuel mixture made in the carburetor; whether too rich, too lean or properly mixed. Given below are the symptoms observed when the engine is not supplied with the proper air/fuel mixture ratio from the carburetor. Check each item as reference for judging the air/fuel mixture condition.

When air/fuel mixture is too rich

1) The engine noise is dull and intermittent.

2) The engine condition becomes worse when the choke is applied.

3) The engine condition becomes worse as it is warmed up.

4) The engine condition improves when the air cleaner is removed.

5) The spark plug is fouled with carbon (wet).

6) The exhaust gas produces heavy smoke.

When air/fuel mixture is too lean

1) The engine overheats.

2) The engine condition improves when the choke is applied.

3) Acceleration is poor.

4) The spark plug is burned white.

5) The speed of the engine fluctuates and lack of power is noticed.

6) Detonation and pinging are experienced.

Tuning Procedure

The following indicates the correct tuning procedure for this motorcycle. Understand the procedure by first riding the motorcycle where it will be used and adjust the engine to the best condition after judging the air/fuel mixture.

Carburetor standard setting

Main jet: #170

Jet needle: NLCT-4th

Slow jet: #45

Pilot screw: 1 and 1/2 turns back

INCLUDED PARTS AND OPTIONAL PARTS

Main jet

Air/fuel mixture

Lean

SIZE P/NO.

Rich

#150

#152

#155

#158

#160

#162

* #165

#168

#170

#172

* #175

#178

#180

#185

#190

09491-30018

09491-30019

09491-31012

09491-31013

09491-32010

09491-32011

09491-33009

09491-33010

09491-34010

09491-34011

09491-35009

09491-35010

09491-36008

09491-37008

09491-38011

Slow jet

Air/fuel mixture

Lean

Rich

SIZE

#35

#40

#42

#45

#48

#50

#52

#55

#58

#60

P/NO.

09492-35019

09492-40022

09492-42019

09492-45032

09492-48013

09492-50023

09492-52011

09492-55017

09492-58001

09492-60016

MACHINE TUNING 4-9

Jet needle

Air/fuel mixture

Lean

SIZE P/NO.

NLDV

NLCV

NLDU

NLCU

* NLDT

NLCT

NLDS

NLCS

NLDR

NLCR

13383-10H90

13383-10H80

13383-10H70

13383-10H60

13383-10H50

13383-10H40

13383-10H30

13383-10H20

13383-10H10

13383-10H00 Rich

SHADED: STANDARD

* : INCLUDED ALTERNATE PARTS

NONE : OPTIONAL PARTS

Adjustment of slow system

1) Set the pilot screw as specified.

2) See if the selected slow jet is correct or not by judging the air/fuel mixture. If air/fuel mixture is rich, replace it with smaller one. If air/fuel mixture is lean, replace it with larger one.

Ex. Slow jet #45

If air/fuel mixture is rich, replace it with #42 slow jet. If air/fuel mixture is lean, replace it with #48 slow jet.

2 Adjustment of main system

With the throttle opened 3/4 to full, make main system adjustment monitoring the air/fuel mixture condition after completion of slow system settings.

* Make sure to adjust the main system before adjusting the intermediate system.

Ex. Main jet #170

If air/fuel mixture is rich, replace it with

#168 main jet. If air/fuel mixture is lean, replace it with #172 main jet.

3 Adjustment of intermediate system

Lean

Rich

Monitor the air/fuel mixture condition and adjust the intermediate system by changing the needle clip position.

4 Final adjustment of slow system

After a proper standard setting has been obtained by the procedure

through

, fine tune the carburetor according to the actual race conditions.

1) Adjust the air/fuel mixture by turning the pilot screw within 3/4 – 2 and 1/4 turns back.

Air/fuel mixture

Lean

Rich

Pilot screw turn back

3/4 turn back

1 turn back

1 and 1/4 turns back

1 and 1/2 turns back

1 and 3/4 turns back

2 turns back

2 and 1/4 turns back

2) If the mixture can not be adjusted by the pilot screw within 3/4 – 2 and 1/4 turns back range, readjust the slow system

5 Final adjustment of intermediate system

Fine tune the intermediate system by changing the needle type and clip position.

4-10 MACHINE TUNING

FRONT FORK TUNING

The front fork compression and rebound damping force, and oil level are adjustable for rider’s preference, rider’s weight and course condition.

NOTE:

* Break-in new front forks before attempting adjustment.

* Be sure to adjust both right and left front forks equally.

* Inspect the following items before attempting adjustment.

* Front fork air pressure adjustment. (

2-33)

* Front fork damage and oil leakage. (

2-33)

* Tire pressure. (

2-34)

* Tire and wheel damage. (

2-33)

* Spoke nipple tension and rim lock tightness. (

2-34)

* Steering movement. (

2-34)

COMPRESSION DAMPING FORCE

ADJUSTMENT

• Turn the adjust screw clockwise until it stops (full hard position).

NOTE:

To set the adjuster, you must gently turn the adjuster screw clockwise until it stops, then back it out the recommended number of turns. Do not force the adjuster screw past the stopped position or you may damage the adjuster.

• Turn the adjust screw 1 counterclockwise and the 7 click is the standard position.

Compression damping force adjuster

Standard setting: 7 clicks turn back

REBOUND DAMPING FORCE ADJUSTMENT

• Turn the adjuster screw clockwise until it stops (full hard position).

NOTE:

• Turn the adjust screw

counterclockwise and the 14 click is the standard position.

Rebound damping force adjuster

Standard setting: 14 clicks turn back

Soft Hard

Hard

OIL QUANTITY MINOR ADJUSTMENT

ADDING THE FORK OIL

• Remove the air bleed screw

• Add the fork oil with a injector from the air bleed hole.

REDUCING THE FORK OIL

• Remove the front forks. (

17-4)

• Remove the air bleed screw.

• Leaning the front fork, reduce the fork oil from the air bleed hole.

Front fork tuning procedure (

4-16)

NOTE:

If 1 ml (0.034/0.035 US/Imp oz) of fork oil is added/reduced, the oil level raises/falls approx. 1.8 mm (0.07 in). Measure the fork oil quantity added/reduced and record it to know the oil quantity after adjustment.

CAUTION

The fork oil quantity must be adjusted equally on both fork legs to provide equal performance.

Operating the motorcycle with the fork oil quantity unevenly adjusted can cause handling instability.

Never mix different types of fork oil. Different oils may cause chemical reaction and deteriorate.

99000-99001-SS5: SUZUKI FORK OIL SS-05

(or equivalent fork oil)

MACHINE TUNING 4-11

4-12 MACHINE TUNING

OIL CHANGE

(Only for outer tube oil chamber)

• Remove the front forks. (

17-4)

• Thoroughly clean the fork before disassembly.

CAUTION

The fork oil quantity must be adjusted equally on both fork legs to provide equal performance.

Scratches or other damage on the inner tube or on the oil seal lip will cause oil leak.

Avoid scratching or damaging the inner tube or the oil seal. Use a mild detergent or car wash soap and sponge out dirt with plenty of water.

• Clamp the outer tube with a vise. Protect the outer tube with a rag when using a vise. (

17-5)

• Loosen and remove the fork cap bolt (sub-tank) from the outer tube and slowly slide down the outer tube. (

17-5)

09941-53630: Front fork top cap wrench

• Hold the front fork inverted position for more than 20 minutes to allow the fork oil to fully drain.

• Force out the remaining oil using compressed air completely.

MACHINE TUNING 4-13

• Slide down the outer tube.

• Pour the specified amount of fork oil into the outer tube.

99000-99001-SS5: SUZUKI FORK OIL SS-05

(or equivalent fork oil)

Parts No.

Spring rate

Soft 51171-37FD0 4.2 N/mm (0.42 kgf/mm)

STD 51171-37FC0 4.4 N/mm (0.44 kgf/mm)

Hard 51171-37FE0 4.6 N/mm (0.46 kgf/mm)

Identification

(Slit mark on the spring end)

III

STD

Oil quantity

365 ml

(12.34/12.85

US/Imp oz)

360 ml

(12.17/12.68

US/Imp oz)

355 ml

(12.00/12.50

US/Imp oz)

Oil quantity adjustable range

330 – 424 ml

(11.15/11.62 –

14.33/14.93

US/Imp oz)

325 – 419 ml

(10.99/11.44 –

14.16/14.75

US/Imp oz)

320 – 414 ml

(10.82/11.27 –

13.99/14.58

US/Imp oz)

NOTE:

Be sure to adjust the fork oil quantity within the above-mentioned range.

• Raise the outer tube and temporarily tighten the fork cap bolt

(sub-tank). (

17-16)

09941-53630: Front fork top cap wrench

• Install the front forks. (

17-17)

4-14 MACHINE TUNING

SPRING CHANGE

• Remove the front forks. (

17-4)

• Thoroughly clean the fork before disassembly.

CAUTION

The fork oil quantity must be adjusted equally on both fork legs to provide equal performance.

Scratches or other damage on the inner tube or on the oil seal lip will cause oil leakage.

Avoid scratching or damaging the inner tube or the oil seal. Use a mild detergent or car wash soap and sponge out dirt with plenty of water.

• Remove the fork cap bolt and drain fork oil. (

17-5)

• Loosen the center bolt completely. (

17-6)

• Compress the outer tube by hands and install the conrod holder (special tool) between the axle holder bottom 1 and lock-nut 2 . (

17-6)

09910-20115: Conrod holder

• Hold the lock-nut with a wrench and remove the center bolt.

(

17-6)

• Remove the push rod. (

17-6)

• Remove the damper rod assembly and fork spring. (

17-7)

• Hold the front fork inverted position for more than 20 minutes the allow the fork oil to fully drain. (

4-12)

• Force out the remaining oil using compressed air completely.

(

4-12)

• Replace the spring.

Soft

SPRING/No.

SPRING RATE

51171-37FD0

Identification

(Slit mark on the spring end)

STD

Hard

51171-37FC0

51171-37FE0

4.2 N/mm

(0.42 kgf/mm)

4.4 N/m

(0.44 kgf/mm)

4.6 N/mm

(0.46 kgf/mm)

III

• Make sure approx. 10 mm (0.39 in) of inner rod thread is exposed on the end. (

17-14)

MACHINE TUNING 4-15

Locknut

Approx.10 mm

(0.39 in)

• Install the damper rod assembly. (

17-14)

• Insert the push rod into the inner rod.

• Insert the shaped projection of center bolt into the push rod. (

17-15)

• Check or adjust the clearance between the lock-nut and center bolt to provide more than 1 mm (0.04 in) and more.

(

17-15)

• Tighten the lock-nut/center bolt to the specified torque.

Lock-nut/center bolt: 22 N·m (2.2 kgf-m, 16.0 lb-ft)

• Tighten the center bolt to the specified torque.

Center bolt: 70 N·m (7.0 kgf-m, 51.0 lb-ft)

• Pour the specified amount fork oil into the outer tube in accordance with the following table.

Soft

STD

Hard

SPRING

51171-37FD0

51171-37FC0

51171-37FE0

STD OIL

QUANTITY

365 ml

(12.34/12.85

US/Imp oz)

360 ml

(12.17/12.68

US/Imp oz)

355 ml

(12.00/12.50

US/Imp oz)

OIL QUANTITY

ADJ. RANGE

330 – 424 ml

(11.15/11.62 –

14.33/14.93

US/Imp oz)

325 – 419 ml

(10.99/11.44 –

14.16/14.75

US/Imp oz)

320 – 414 ml

(10.82/11.27 –

13.99/14.58

US/Imp oz)

99000-99001-SS5: SUZUKI FORK OIL SS-05

(or equivalent fork oil)

1 mm (0.04 in) and more

4-16 MACHINE TUNING

FRONT FORK TUNING PROCEDURE

Test ride the motorcycle and find out how the front suspension reacts on various types of surface. According to the symptom noticed, adjust the front fork to the best setting for rider and race track conditions. To adjust, attempt changing fork oil capacity and compression and rebound damping force following the instructions below.

bottoms

SYMPTOM

Feels too hard overall

Feels too soft overall and

SECTION

• Jump

• Large bumps

• Series of medium bumps

• Jump

• Large bump

• When braking

ADJUSTMENT PROCEDURE

1. Adjust both compression and rebound damping force to a softer setting.

2. Decrease fork oil capacity.

3. Replace the spring with an optional softer one.

1. Adjust the compression damping force to a stiffer setting.

2. Increase fork oil capacity.

3. Replace the spring with an optional stiffer one.

1. Decrease fork oil capacity.

Feels too hard near end of travel

• Jump

Feels too soft near end of travel and bottoms harshly

Feels too hard in the beginning of stroke

• Jump

• Large bump

• Jump

• Large bump

• Series of medium bumps

• Series of small bumps

Feels too soft and unstable

Bounces

1. Adjust the compression damping force to a stiffer setting.

2. Increase fork oil capacity.

1. Adjust the compression damping force to a softer setting.

• Series of medium bumps

• Series of small bumps

• Jump

• Large bump

1. Adjust the rebound damping force to a stiffer setting.

• Series of small bumps 1. Adjust the rebound damping force to a softer setting.

NOTE:

When adjusting the front fork oil capacity, make sure that the oil level is within the specified range. Also, the capacity should be increased or decreased by 1 ml (0.034/0.035 US/Imp oz) [Approx. 1.8 mm (0.07 in)] at a time.

When adjusting the damping force , attempt turning the adjuster 1 to 2 click stops at a time for each adjustment.

MACHINE TUNING 4-17

REAR SUSPENSION TUNING

The rear suspension compression and rebound damping force, and spring pre-load are adjustable for rider’s preference, rider’s weight and course condition.

NOTE:

* Break-in the rear suspension when riding with a new rear cushion unit. (

1-6)

* Inspect the following items before attempting adjustment.

* Rear shock absorber damage and oil leakage. (

2-33)

* Swingarm and links tightness. (

2-33)

* Tire pressure. (

2-34)

* Tire and wheel damage. (

2-33)

* Spoke nipple tension and rim lock tightness. (

2-34)

COMPRESSION DAMPING FORCE

ADJUSTMENT

NOTE:

To set the adjuster, you must gently turn the adjust screw or bolt clockwise until it stops, then back it out the recommended number of turns. Do not force the adjust screw or bolt past the stopped position, or you may damage the adjuster.

Low-side

• Turn the adjust screw

clockwise until it stops (full hard position).

• Turn the adjust screw 1 counterclockwise about 8 clicks.

Standard setting: (Lo-side) 8 clicks turn back

High-side

• Turn the adjust bolt 2 clockwise until it stops (full hard position).

• Turn the adjust bolt

counterclockwise about 1 turn until the two punch marks ( A , B ) align.

Standard setting: (Hi-side) 1 turn back

Soft

Hard

Soft

Hard

4-18 MACHINE TUNING

REBOUND DAMPING FORCE ADJUSTMENT

NOTE:

To set the adjuster, you must gently turn the adjust screw clockwise until it stops, then back it out the recommended number of turns. Do not force the adjust screw past the stopped position, or you may damage the adjuster.

• Turn the adjust screw 1 clockwise until it stops (full hard position).

• Turn the adjust screw 1 counterclockwise about 7 clicks until the two punch marks align.

Standard setting: 7 clicks turn back

SPRING PRE-LOAD ADJUSTMENT

• Place a block under the chassis tube.

• Remove the muffler and seat rail assembly. (

18-3)

• Loosen the lock-nut 1 with the special tool.

09910-60611: Universal clamp wrench

• Turn the adjuster 2 clockwise or counterclockwise to change the spring pre-load.

• Tighten the lock-nut 1 .

Standard spring set length: 5.6 mm (0.22 in) compressed from spring free length

Spring set length adjustable range:

247 – 263 mm (9.72 – 10.35 in)

[at spring free length 265 mm (10.43 in)]

NOTE:

Turning the adjuster 2 without loosening the lock-nut 1 can damage the rear cushion unit.

Soft

Hard

MACHINE TUNING 4-19

REAR SUSPENSION TUNING PROCEDURE

• Adjust the rear suspension according to the rider’s weight and preference by referring to the table below.

Spring Set-length adjustable range

Soft

Standard

Hard

Part No.

62211-10H20

62211-10H10

62211-10H00

62211-37FM0

62211-35G30

Spring rate

50 N/mm

(5.0 kgf/mm)

52 N/mm

(5.2 kgf/mm)

54 N/mm

(5.4 kgf/mm)

56 N/mm

(5.6 kgf/mm)

57 N/mm

(5.7 kgf/mm)

Marking paint

White

Yellow

Green

Pink

Pink × 2

247 – 263 mm

(9.72 – 10.35 in)

[at spring free length 265 mm

(10.43 in)]

• Measure the distance L1 from the seat bolt to the chain adjuster lock-nut with the motorcycle on the stand and the rear wheel lifted off the ground.

• Measure the distance L2 from the seat bolt to the chain adjuster lock-nut with the motorcycle off the stand and riding the motorcycle normally in full riding gear.

• Find the sag by subtracting L2 from L1. Standard sag range is

100 mm (3.94 in).

When the sag measured is:

Less than 100 mm

(3.94 in)

More than 100 mm

(3.94 in)

Adjustment procedure

Reduce spring pre-set length by turning the spring adjuster nut.

Increase spring pre-set length by turning the spring adjuster nut.

4-20 MACHINE TUNING

After the sag measurement has been set 100 mm (3.94 in), test ride the motorcycle and adjust the suspension for the rider and track conditions referring to the guide below.

SYMPTOM

Feels too hard overall

Kicks up

Bottom feeling or feels too soft and unstable

Feels harsh and hits bumps too harshly

Provides poor traction

Tends to sink front than rear

SECTION ADJUSTMENT PROCEDURE

• Jump

• Series of bumps

1. Adjust the low speed compression damping force to a softer setting. (See note below.)

2. Adjust the rebound damping force to a softer setting. (See note below.)

3. Replace the spring with an optional softer one.

(

4-19)

4. Adjust the high speed compression damping force to a softer setting. (See note below.)

• Medium to large bumps 1. Adjust the low speed compression damping force and rebound damping force to a harder setting. (See note below.)

2. Adjust the high speed compression damping force to a harder setting. (See note below.)

• Jump

• Large bump

• Series of bumps

1. Adjust the low speed compression damping force to a harder setting. (See note below.)

2. Adjust the rebound damping force to a harder setting. (See note below.)

• Jump

• Large bump

• Series of bumps

• Accelerating

• Series of small bumps

3. Replace the spring with an optional stiffer one.

(

4-19)

1. Adjust the low speed compression damping force to a harder setting. (See note below.)

2. Adjust the rebound damping force to a harder setting. (See note below.)

3. If bottom feeling become after adjusting above mentions, adjust the high speed compression damping force to a harder setting.

(See note below.)

1. Adjust the rebound damping force to a harder setting. (See note below.)

2. If traction feeling does not improve after adjusting above mention, adjust the low speed compression damping force to a softer setting.

(See note below.)

3. If bottom feeling become after adjusting above mentions, adjust the high speed compression damping force to a harder setting. (See note below.)

• Decelerating or braking 1. Adjust the high speed compression damping force to a softer setting. (See note below.)

2. Adjust the rebound damping force to a harder setting. (See note below.)

NOTE:

When adjusting the damping force setting, attempt turning the adjuster 1 to 2 click stops at a time for each adjustment.

MACHINE TUNING 4-21

SUSPENSION BALANCE

Balancing the front to rear suspension properly is the most critical adjustment for suspension performance. If the front forks are adjusted harder than the rear suspension, such as changing to heavier front fork oil, stiffer compression and rebound setting, air pressure build up in the forks and so on, the front forks will collapse less on bumps. This transfers more of the motorcycle and rider weight rearward, possibly causing the rear suspension to bottom, where as it felt fine before the front fork adjustment was made.

BALANCE TEST

Stand next to the motorcycle on level ground. Place one foot on the foot rest closest to you. Sharply push down. The front and rear suspensions should both collapse equally.

BALANCING TIPS

• Check for air pressure build-up in front forks. Heat and altitude will increase air pressure in the front forks.

• Always stay within sag measurement limits, 100 mm (3.94 in), when using spring pre-set to stiffen or soften rear suspension. If this is not possible, the next stiffer or softer accessory spring is needed.

• The rear shock compression damping can be used to fine tune suspension balance and is easy to access.

– MEMO –

ENGINE REMOVAL AND INSTALLATION 5-1

ENGINE REMOVAL AND INSTALLATION

ENGINE REMOVAL AND INSTALLATION ................................................. 5- 2

REMOVAL ............................................................................................. 5- 2

INSTALLATION ..................................................................................... 5- 6

5

5-2 ENGINE REMOVAL AND INSTALLATION

ENGINE REMOVAL AND INSTALLATION

REMOVAL

• Drain engine oil. (

2-12)

• Drain engine coolant. (

13-3)

• Remove the seat 1 .

• Remove the radiator covers 2 , left and right.

• Remove the right frame cover 3 .

• Place the jack under the frame to support the motorcycle.

WARNING

To prevent the motorcycle from falling, make sure to support the frame with a jack.

• Turn the fuel valve lever to the “OFF” position and disconnect the fuel hose 4 .

• Remove the fuel tank with the fuel valve.

• Remove the muffler 5 .

• Remove the exhaust pipe 6 and exhaust pipe gasket 7 .

ENGINE REMOVAL AND INSTALLATION 5-3

• Remove the front protector.

• Remove the radiator mounting bolts, left and right.

• Disconnect the radiator hose 8 , 9 .

• Remove the radiator hose 0 .

5-4 ENGINE REMOVAL AND INSTALLATION

• Disconnect the magneto lead wire coupler A and clamp.

• Disconnect the clutch cable B .

• Remove the carburetor. (

12-5)

• Remove the ignition coil/plug cap. (

2-7)

• Remove the cotter pin C , washer D and clip E .

• Remove the kick starter lever F .

• Remove the brake pedal spring G , master cylinder rod pin H and brake pedal I .

• Remove the gearshift lever J .

NOTE:

Mark the gearshift shaft head at which the gearshift lever slit set for correct reinstallation.

• Remove the engine sprocket cover

and chain guide plate

L .

• Remove the drive chain clip M and release the drive chain.

• Remove the snap ring N and engine sprocket O .

09900-06107: Snap ring pliers

ENGINE REMOVAL AND INSTALLATION 5-5

• Remove the engine mounting upper brackets P , left and right.

• Remove the engine mounting front brackets Q , left and right.

• Remove the engine mounting bolt and nut R .

• Remove the swingarm pivot shaft nut and washer.

• Extract three quarters of the swingarm pivot shaft so as to keep the swingarm in position.

NOTE:

The swingarm will come off when the swingarm pivot shaft is completely removed.

• Remove the engine from the frame.

5-6 ENGINE REMOVAL AND INSTALLATION

INSTALLATION

Install the engine in the reverse order of removal. Pay attention to the following points:

• Fit the swingarm in its position and hold it with the swingarm pivot shaft.

• Mount the engine on the frame.

• Tighten the engine mounting bolts, nuts and swingarm pivot shaft nut.

Tightening torque

Bolt Length

55 mm (2.17 in)

50 mm (1.97 in)

95 mm (3.74 in)

96 mm (3.78 in)

120 mm (4.72 in)

1 , 3 (Bolt, Nut)

2 (Bolt, Nut)

4 (Bolt, Nut)

5 (Bolt, Nut)

(Shaft, Washer, Nut)

N·m

70 kgf-m

4.0

4.5

6.0

5.5

7.0

lb-ft

29.0

32.5

43.5

40.0

50.5

CAUTION

The engine mounting nut is the self-lock type and cannot be used repeatedly. If the self-lock effect is lose, replace it with a new one.

• Install the engine sprocket 7 and snap ring 8 .

CAUTION

Replace the snap ring with a new one.

Seat the snap ring in the groove and locate its end as shown in the illustration.

09900-06107: Snap ring pliers

• Reassemble the drive chain clip so the slit end faces opposite the direction of rotation.

Direction of travel

Thrust

Sharp edge

• Tighten the engine sprocket cover bolts to the specified torque.

Engine sprocket cover bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Install the gearshift lever in the correct position.

ENGINE REMOVAL AND INSTALLATION 5-7

• Apply grease to the brake pedal pivot bolt.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Install the brake pedal and brake pedal spring. (

19-28)

• Install the clip 9 , washer and cotter pin 0 .

CAUTION

Replace the cotter pin 0 with a new one.

• Install the kick starter lever in the correct position. (

8-7)

Kick starter lever bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Install the ignition coil/spark plug cap securely. (

2-7)

• Fit the projection of the carburetor to the depression of intake pipe.

45 ± 10˚

5-8 ENGINE REMOVAL AND INSTALLATION

• Install the muffler joint connector A and exhaust pipe gasket

B .

CAUTION

Replace the connector A and gasket B with new ones to prevent exhaust gas leakage.

• Temporarily tighten the exhaust pipe nuts C .

• Insert the muffler to the exhaust pipe.

• Temporarily tighten the muffler mounting front bolt D and rear bolt E .

• Temporarily tighten the connector clamp bolt F .

NOTE:

When install the connector clamp, fit the convex part of the connector clamp onto the concave part of muffler.

• Check the clearance between exhaust pipe and radiator hose.

• Be sure to tighten the bolts and nuts in the following order.

1)Exhaust pipe nuts C

2)Muffler mounting front bolt

3)Muffler mounting rear bolt E

4)Connector clamp bolt F

Exhaust pipe nut: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

Muffler mounting bolt (Front & Rear): 23 N·m (2.3 kgf-m, 16.5 lb-ft)

Connector clamp bolt: 21 N·m (2.1 kgf-m, 15.0 lb-ft)

INSPECTION AFTER INSTALLATION

• Engine oil level (

2-11)

• Engine coolant level and leakage (

2-15, -16)

• Fuel leakage (

2-21)

• Exhaust gas leakage

• Throttle cable play (

2-18)

• Clutch cable play (

2-17)

• Drive chain slack (

2-28)

• Brake pedal height (

2-32)

• Wiring harness, cable and hose routing (

19-18 to -23)

CYLINDER HEAD, CYLINDER AND PISTON 6-1

CYLINDER HEAD, CYLINDER AND PISTON

CONSTRUCTION ........................................................................................ 6- 2

CYLINDER HEAD, CYLINDER AND PISTON ...................................... 6- 2

ENGINE TOP SIDE ...................................................................................... 6- 3

CYLINDER HEAD COVER REMOVAL ................................................. 6- 3

CAMSHAFTS (AUTOMATIC DECOMP.)

AND CAM CHAIN TENSION ADJUSTER REMOVAL ......................... 6- 3

CYLINDER HEAD REMOVAL .............................................................. 6- 4

CYLINDER REMOVAL .......................................................................... 6- 5

PISTON AND PISTON RING REMOVAL ............................................. 6- 6

CAM CHAIN, CAM CHAIN TENSIONER AND

CAM CHAIN GUIDE REMOVAL ........................................................... 6- 7

ENGINE TOP COMPONENTS INSPECTION AND SERVICE .................... 6- 8

AUTOMATIC DECOMP. INSPECTION ................................................. 6- 8

CAMSHAFT INSPECTION .................................................................... 6- 8

CAM CHAIN TENSION ADJUSTER INSPECTION .............................. 6-10

CAM CHAIN No.1 GUIDE, CAM CHAIN No.2 GUIDE AND

CAM CHAIN TENSIONER INSPECTION ............................................. 6-11

CYLINDER HEAD AND VALVE INSPECTION ..................................... 6-11

INTAKE PIPE REMOVAL ..................................................................... 6-19

INTAKE PIPE INSTALLATION ............................................................. 6-19

CYLINDER INSPECTION ...................................................................... 6-20

PISTON AND PISTON RING INSPECTION ......................................... 6-21

CRANKSHAFT AND CONROD INSPECTION ..................................... 6-23

CAM CHAIN, CAM CHAIN TENSIONER AND

CAM CHAIN GUIDE INSTALLATION ................................................... 6-24

PISTON AND PISTON RING INSTALLATION ..................................... 6-25

CYLINDER AND CYLINDER HEAD INSTALLATION .......................... 6-27

CAMSHAFT (AUTOMATIC DECOMP.) AND

CAM CHAIN TENSION ADJUSTER INSTALLATION .......................... 6-29

CYLINDER HEAD COVER INSTALLATION ........................................ 6-33

6

6-2 CYLINDER HEAD, CYLINDER AND PISTON

CONSTRUCTION

CYLINDER HEAD, CYLINDER AND PISTON

14 N.m

(1.4 kgf-m, 10.0 lb-ft)

50 N.m

5.0 kgf-m,

36.0 lb-ft

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

4.5 N.m

0.45 kgf-m,

3.25 lb-ft

10 N.m

(1.0 kgf-m, 7.0 lb-ft)

50 N.m

(5.0 kgf-m, 36.0 lb-ft)

23 N.m

2.3 kgf-m,

16.5 lb-ft

12 N.m

1.2 kgf-m,

8.5 lb-ft

12 N.m (1.2 kgf-m,

8.5 lb-ft)

10 N.m

1.0 kgf-m,

7.0 lb-ft

10 N.m

1.0 kgf-m,

7.0 lb-ft

10 N.m

1.0 kgf-m,

7.0 lb-ft

ENGINE TOP SIDE

CYLINDER HEAD COVER REMOVAL

• Remove the seat. (

5-2)

• Remove the radiator covers and fuel tank. (

5-2)

• Disconnect the ignition coil/plug cap and remove the spark plug. (

2-7)

• Remove the cylinder head cover 1 and cylinder head cover gasket.

CYLINDER HEAD, CYLINDER AND PISTON 6-3

CAMSHAFTS (AUTOMATIC DECOMP.) AND

CAM CHAIN TENSION ADJUSTER REMOVAL

• Remove the cylinder head cover. (

above)

• Remove the TDC plug 1 and crankshaft hole plug 2 .

• Place a wrench over the crankshaft and turn it counterclockwise to align the TDC mark A with the center of the grooves

B of the timing inspection hole.

NOTE:

The piston must be at TDC on the compression stroke.

Match mark Match mark

6-4 CYLINDER HEAD, CYLINDER AND PISTON

• Remove the cam chain tension adjuster cap bolt 3 , bar and spring.

• Remove the cam chain tension adjuster 4 and its gasket.

• Remove the camshaft journal holders 5 .

NOTE:

Loosen the camshaft journal holder bolts diagonally.

• Disengage the camshafts 7 from cam chain 6 .

• Remove the dowel pins and C-rings 8 .

CAUTION

Do not drop the cam chain

, dowel pins and C-rings

8 into the crankcase.

CYLINDER HEAD REMOVAL

• Remove the camshafts. (

above)

• Remove the spark plug. (

2-7)

• Remove the carburetor. (

12-5)

• Drain engine coolant. (

13-3)

• Remove the exhaust pipe 1 and gaskets.

• Loosen the clamp and disconnect the radiator hose 2 .

• Remove the engine mounting upper brackets.

• Remove the cylinder head base nuts 3 .

• Loosen the cylinder base bolt 4 .

• Remove the cylinder head bolts and washers.

NOTE:

When loosening the cylinder head bolts, loosen each bolt little by little diagonally.

• Remove the cylinder head 5 .

NOTE:

If the cylinder head does not come off easily, lightly tap it using a plastic hammer.

• Remove the cylinder head gasket 6 , dowel pins and cam chain No.1 guide 7 .

CAUTION

Do not drop the cam chain and dowel pins into the crankcase.

CYLINDER REMOVAL

• Remove the cylinder head. (

above)

• Remove the cylinder 1 by removing the cylinder base bolt.

CAUTION

Do not drop the cam chain into the crankcase.

NOTE:

If the cylinder does not come off easily, lightly tap it using a plastic hammer.

CYLINDER HEAD, CYLINDER AND PISTON 6-5

6-6 CYLINDER HEAD, CYLINDER AND PISTON

• Remove the cylinder gasket 2 and dowel pins.

PISTON AND PISTON RING REMOVAL

• Remove the cylinder. (

6-5)

• Place a clean rag over the cylinder base to prevent the piston pin circlip 1 from dropping into the crankcase.

• Remove the piston pin circlip 1 .

• Remove the piston pin 2 and piston 3 .

• Carefully spread the ring opening with your thumbs and then push up the opposite side of the ring

to remove it.

• Remove the oil ring in the same procedure.

CAM CHAIN, CAM CHAIN TENSIONER AND

CAM CHAIN GUIDE REMOVAL

• Remove the cylinder head. (

6-4)

• Remove the magneto cover and magnet rotor. (

14-12)

• Remove the cam chain guide retainer 1 and cam chain No.1

guide 2 .

• Remove the cam chain 3 .

• Remove the cam chain tensioner 4 .

CYLINDER HEAD, CYLINDER AND PISTON 6-7

6-8 CYLINDER HEAD, CYLINDER AND PISTON

ENGINE TOP COMPONENTS

INSPECTION AND SERVICE

AUTOMATIC DECOMP. INSPECTION

• Check the decomp. cam moves smoothly and shaft 1 rotates together.

• If any abnormal condition are found, replace the camshaft assembly.

CAMSHAFT INSPECTION

CAUTION

The camshaft assembly can not be disassembled.

CAM SPROCKET

• Inspect the sprocket teeth for wear.

• If they are worn, replace the camshafts, crankshaft and cam chain as a set.

CAMSHAFT BEARING

• Inspect the bearings for play, discoloration, wear and seizure.

• Move the outer race by finger and inspect for smooth movement.

• If there is anything unusual, replace the camshaft assembly.

CAM WEAR

• Measure the cam height H using the micrometer.

• Replace a camshaft if the cams are worn to the service limit.

Cam height

Service Limit IN.: 34.56 mm (1.361 in)

EX.: 34.08 mm (1.342 in)

09900-20202: Micrometer (25 – 50 mm)

CAMSHAFT JOURNAL WEAR

• Determine whether or not each journal is worn down to the limit by measuring the oil clearance with the camshaft installed in place.

• Use the plastigauge to read the clearance at the widest portion, which is specified as follows:

09900-22301: Plastigauge

09900-22302: Plastigauge

• Tighten the camshaft journal holder bolts evenly and diagonally to the specified torque.

NOTE:

Install the camshaft journal holders to their original positions.

Camshaft journal holder bolt:

10 N·m (1.0 kgf-m, 7.0 Ib-ft)

NOTE:

Do not rotate the camshaft with the plastigauge in place.

• Remove the camshaft journal holders, and read the width of the compressed plastigauge with envelope scale. This measurement should be taken at the widest part.

Camshaft journal oil clearance:

Service Limit (IN. & EX.): 0.150 mm (0.0059 in)

CYLINDER HEAD, CYLINDER AND PISTON 6-9

6-10 CYLINDER HEAD, CYLINDER AND PISTON

• If the camshaft journal oil clearance measured exceeds the limit, measure the inside diameter of the camshaft journal holder and outside diameter of the camshaft journal.

• Replace the camshaft or the cylinder head depending upon which one exceeds the specification.

Camshaft journal holder I.D.:

Standard: (IN. & EX.): 22.003 – 22.025 mm

(0.8663 – 0.8671 in)

09900-20602: Dial gauge (1/1 000, 1 mm)

09900-22403: Small bore gauge (18 – 35 mm)

Camshaft journal O.D.:

Standard (IN. & EX.): 21.959 – 21.980 mm

(0.8645 – 0.8654 in)

09900-20205: Micrometer (0 – 25 mm)

CAM CHAIN TENSION ADJUSTER

INSPECTION

• Remove the cam chain tension adjuster cap bolt, bar and spring. (

6-4)

• Check that the push rod slides smoothly when releasing stopper 1 .

• If it does not slide smoothly, replace the cam chain tension adjuster with a new one.

CAM CHAIN No.1 GUIDE, CAM CHAIN No.2

GUIDE AND CAM CHAIN TENSIONER

INSPECTION

• Inspect the contacting surface of the cam chain guides and cam chain tensioner.

• If it is worn or damaged, replace it with a new one.

CYLINDER HEAD, CYLINDER AND PISTON 6-11

CYLINDER HEAD AND VALVE INSPECTION

VALVE DISASSEMBLY

• Remove the tappet 1 and shim 2 by fingers or magnetic hand.

CAUTION

Identify the position of each removed part.

(Intake side)

• Using the special tools, compress the valve spring and remove the two cotter halves 3 from the valve stem.

09916-14510: Valve lifter

09916-14521: Attachment

09916-84511: Tweezers

CAUTION

Be careful not to damage the tappet sliding surface with the special tool.

6-12 CYLINDER HEAD, CYLINDER AND PISTON

(Exhaust side)

• Install the sleeve protector a between the valve spring and cylinder head.

• Using the special tools, compress the valve spring and remove the two cotter halves 3 from the valve stem.

CAUTION

To prevent damage of the tappet sliding surface with the special tool, use the sleeve protector a .

09916-14510: Valve lifter

09916-14530: Attachment

09916-84511: Tweezers

09919-28610: Sleeve protector

• Remove the valve spring retainer

and valve spring

• Remove the valve

from the combustion chamber side.

• Remove the valve stem seal

and spring seat

CAUTION

Do not reuse the removed valve stem seal.

• Remove the other valves in the same manner as described previously.

CYLINDER HEAD DISTORTION

• Decarbonize the combustion chamber.

• Check the gasket surface of the cylinder head for distortion with a straightedge and thickness gauge, taking a clearance reading at several places indicated.

• If the largest reading at any position of the straightedge exceeds the limit, replace the cylinder head.

Cylinder head distortion:

Service Limit: 0.05 mm (0.002 in)

09900-20803: Thickness gauge

VALVE STEM RUNOUT

• Support the valve using V-blocks and check its runout using the dial gauge as shown.

• If the runout exceeds the service limit, replace the valve.

CAUTION

Be careful not to damage the valve head and valve stem when handling it.

Valve stem runout (IN. & EX.):

Service Limit: 0.05 mm (0.002 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block (100 mm)

VALVE HEAD RADIAL RUNOUT

• Place the dial gauge at a right angle to the valve head face and measure the valve head radial runout.

• If it measures more than the service limit, replace the valve.

CAUTION

Be careful not to damage the valve head and valve stem when handling it.

Valve head radial runout (IN. & EX.):

Service Limit: 0.03 mm (0.001 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block (100 mm)

VALVE STEM AND VALVE FACE WEAR CONDITION

• Visually inspect each valve stem and valve face for wear and pitting.

• If it is worn or damaged, replace the valve with a new one.

CYLINDER HEAD, CYLINDER AND PISTON 6-13

6-14 CYLINDER HEAD, CYLINDER AND PISTON

VALVE STEM DEFLECTION

• Lift the valve about 10 mm (0.39 in) from the valve seat.

• Measure the valve stem deflection in two directions, perpendicular to each other, by positioning the dial gauge as shown.

• If the deflection measured exceeds the limit, then determine whether the valve or the guide should be replaced with a new one.

Valve stem deflection (IN. & EX.):

Service Limit: 0.25 mm (0.010 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

VALVE STEM WEAR

• If the valve stem is worn down to the limit, as measured with a micrometer, replace the valve.

• If the stem is within the limit, then replace the guide.

• After replacing valve or guide, be sure to recheck the deflection.

NOTE:

If valve guides have to be removed for replacement after inspecting related parts, carry out the steps shown in valve guide servicing.

Valve stem O.D.:

Standard (IN.) : 4.475 – 4.490 mm (0.1762 – 0.1768 in)

(EX.): 4.455 – 4.470 mm (0.1754 – 0.1760 in)

09900-20205: Micrometer (0 – 25 mm)

VALVE GUIDE SERVICING

• Using the valve guide remover, drive the valve guide out toward the intake or exhaust camshaft side.

NOTE:

* Discard the removed valve guide subassemblies.

* Only oversized valve guides are available as replacement parts. (Part No. 11115-10H70)

09916-43211: Valve guide remover/installer

• Re-finish the valve guide holes in cylinder head with the reamer and handle.

CAUTION

When refinishing or removing the reamer from the valve guide hole, always turn it clockwise.

09916-33320: Valve guide reamer (9.8 mm)

09916-34542: Reamer handle

CYLINDER HEAD, CYLINDER AND PISTON 6-15

• Cool down the new valve guides in a freezer for about one hour and heat the cylinder head to 100 – 150 °C (212 – 302

°F) with a hot plate.

CAUTION

Do not use a burner to heat the valve guide hole to prevent cylinder head distortion.

• Apply engine oil to the valve guide hole.

CAUTION

Failure to oil the valve guide hole before driving the new guide into place may result in a damaged guide or head.

• Drive the valve guide into the hole using the valve guide installer 1 and attachment 2 .

NOTE:

Install the valve guide until the attachment contacts with the cylinder head

09916-43211: Valve guide remover/installer

09916-44920: Valve guide installer attachment 2

• After installing the valve guides, re-finish their guiding bores using the reamer.

• Clean and engine oil the guides after reaming.

NOTE:

* Be sure to cool down the cylinder head to ambient air temperature.

* Insert the reamer from the combustion chamber and always turn the reamer handle clockwise.

09916-33210: Valve guide reamer

09916-34542: Reamer handle

VALVE SEAT WIDTH INSPECTION

• Visually check for valve seat width on each valve face.

• If the valve face has worn abnormally, replace the valve.

• Coat the valve seat with Prussian Blue and set the valve in place. Rotate the valve with light pressure.

• Check that the transferred blue on the valve face is uniform all around and in center of the valve face.

09916-10911: Valve lapper set

15 mm

(0.59 in)

6-16 CYLINDER HEAD, CYLINDER AND PISTON

• If the seat width W measured exceeds the standard value or seat width is not uniform, refuse the seat using the seat cutter.

Valve seat width W :

Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)

VALVE SEAT SERVICING

The valve seats 1 for both the intake and exhaust valves 2 are machined to three different angles. The seat contact surface is cut at 45°.

Seat angle

Seat width

Valve diameter

Valve guide I.D.

INTAKE

15°, 45°, 60°

0.9 – 1.1 mm

(0.035 – 0.043 in)

31 mm (1.22 in)

4.500 – 4.512 mm

(0.1772 – 0.1776 in)

EXHAUST

←

25 mm (0.98 in)

←

CAUTION

The valve seat contact area must be inspected after each cut.

Do not use lapping compound after the final cut is made. The finished valve seat should have a velvety smooth finish but not a highly polished or shiny finish. This will provide a soft surface for the final seating of the valve which will occur during the first few seconds of engine operation.

CAUTION

The titanium valves are coated with an oxidized membrane treatment to resist wear but the membrane tend to be removed if lapped after valve seat servicing.

NOTE:

After servicing the valve seats, be sure to check the valve clearance after the cylinder head has been reinstalled. (

2-22)

60 ˚

45 ˚

30 ˚

• Clean and assemble the head and valve components. Fill the intake and exhaust ports with gasoline to check for leaks.

• If any leaks occur, inspect the valve seat and face for burrs or other things that could prevent the valve from sealing.

WARNING

Always use extreme caution when handling gasoline.

VALVE SPRING

• Check the valve spring for proper strength by measuring its free length and also by the force required to compress it.

• If the spring length is less than the service limit, or if the force required to compress the spring does not fall within the range specified, replace the spring.

Valve spring free length:

Service limit: (IN.): 37.1 mm (1.46 in)

: (EX.): 37.5 mm (1.48 in)

09900-20101: Vernier calipers (150 mm)

Valve spring tension:

Standard: (IN. & EX.): 147 N (15 kgf)/33.55 mm

(33.1 lbs/1.321 in)

CYLINDER HEAD, CYLINDER AND PISTON 6-17

VALVE REASSEMBLY

• Install the valve spring seat.

• Apply MOLYBDENUM OIL SOLUTION to the stem seal 1 , and press-fit it into position.

CAUTION

Do not reuse the removed stem seal.

MOLYBDENUM OIL SOLUTION

• Insert the valve, with its stem coated with MOLYBDENUM

OIL SOLUTION all around and along the full stem length without any break.

CAUTION

When inserting the valve, take care not to damage the lip of the stem seal.

MOLYBDENUM OIL SOLUTION

6-18 CYLINDER HEAD, CYLINDER AND PISTON

• Install the valve spring with the small-pitch portion A facing cylinder head.

A Small-pitch portion

B Large-pitch portion

C UPWARD

D Paint

• Put on the valve spring retainer 2 , and using the valve lifter and sleeve protector a (only for exhaust side), press down the spring, fit the valve cotter halves to the stem end, and release the lifter to allow the valve cotter 3 to wedge in between retainer and stem.

09916-14510: Valve lifter

09916-14521: Attachment (For IN. side)

09916-14530: Attachment (For EX. side)

09916-28610: Sleeve protector

09916-84511: Tweezers

• Be sure that the rounded lip

of the cotter fits snugly into the groove

in the stem end.

• Install the other valves and springs in the same manner as described previously.

CAUTION

Be sure to restore each spring and valve to their original positions.

Be careful not to damage the valve and valve stem when handling it.

4 Valve spring retainer

Valve cotter

• Install the tappet shims and the tappets to their original positions.

NOTE:

* Apply engine oil to the stem end, shim and tappet before fitting them.

* When seating the tappet shim, be sure the figure printed surface faces the tappet.

IN.

EX.

INTAKE PIPE REMOVAL

• Remove the intake pipe 1 .

INTAKE PIPE INSTALLATION

• Install the intake pipe.

NOTE:

Fit the recess A of the intake pipe into the projection B of the cylinder head.

CYLINDER HEAD, CYLINDER AND PISTON 6-19

6-20 CYLINDER HEAD, CYLINDER AND PISTON

CYLINDER INSPECTION

CYLINDER DISTORTION

• Check the gasketed surface of the cylinder for distortion with a straightedge and thickness gauge, taking a clearance reading at several places indicated.

• If the largest reading at any position of the straightedge exceeds the limit, replace the cylinder.

Cylinder distortion:

Service Limit: 0.05 mm (0.002 in)

09900-20803: Thickness gauge

CYLINDER BORE

• Inspect the cylinder wall for any scratches, nicks or other damage.

• Measure the cylinder bore diameter at six places.

Cylinder bore:

Standard: 77.000 – 77.015 mm (3.0315 – 3.0321 in)

09900-20530: Cylinder gauge set

PISTON AND PISTON RING INSPECTION

PISTON DIAMETER

• Using a micrometer, measure the piston outside diameter at

8.5 mm (0.33 in) A from the piston skirt end.

• If the measurement is less than the limit, replace the piston.

Piston diameter:

Service Limit: 76.880 mm (3.0268 in) at 8.5 mm (0.33 in) from the skirt end

09900-20204: Micrometer (75 – 100 mm)

CYLINDER HEAD, CYLINDER AND PISTON 6-21

PISTON-TO-CYLINDER CLEARANCE

• Subtract the piston diameter from the cylinder bore diameter.

(

above)

• If the piston-to-cylinder clearance exceeds the service limit, replace the cylinder or the piston, or both.

Piston-to-cylinder clearance:

Service Limit: 0.120 mm (0.0047 in)

PISTON PIN AND PIN BORE

• Measure the piston pin bore inside diameter using the small bore gauge.

• If the measurement is out of specifications replace the piston.

Piston pin bore:

Service Limit: 16.030 mm (0.6311 in)

09900-20602: Dial gauge (1/1 000, 1 mm)

09900-22401: Small bore gauge (10 – 18 mm)

• Measure the piston pin outside diameter at three positions using the micrometer.

• If any of the measurements are out of specification, replace the piston pin.

Piston pin O.D.:

Service Limit: 15.980 mm (0.6291 in)

09900-20205: Micrometer (0 – 25 mm)

6-22 CYLINDER HEAD, CYLINDER AND PISTON

PISTON RING-TO-GROOVE CLEARANCE

• Decarbonize the piston ring and piston ring groove.

• Measure the side clearances of the 1st piston ring using the thickness gauge.

• If any of the clearances exceed the limit, replace both the piston and piston ring.

09900-20803: Thickness gauge

09900-20205: Micrometer (0 – 25 mm)

Piston ring-to-groove clearance:

Service Limit (1st): 0.180 mm (0.007 in)

Piston ring groove width:

Standard (1st): 1.01 – 1.03 mm (0.0398 – 0.0406 in)

(Oil): 1.51 – 1.53 mm (0.0594 – 0.0602 in)

Piston ring thickness:

Standard (1st): 0.97 – 0.99 mm (0.0382 – 0.0390 in)

PISTON RING FREE END GAP AND PISTON RING END GAP

• Measure the piston ring free end gap using the vernier calipers.

• Next, fit the piston ring squarely into the cylinder and measure the piston ring end gap using the thickness gauge.

• If any of the measurements exceed the service limit, replace the piston ring with a new one.

Piston ring free end gap:

Service Limit (1st): 5.6 mm (0.22 in)

09900-20101: Vernier calipers (150 mm)

Piston ring end gap:

Service Limit (1st): 0.50 mm (0.020 in)

09900-20803: Thickness gauge

CRANKSHAFT AND CONROD INSPECTION

For inspection other than the following, refer to page 10-7,-8.

CONROD SMALL END I.D.

• Using a small bore gauge, measure the inside diameter of the conrod small end.

• If the inside diameter of the conrod small end exceeds the limit, replace the conrod.

Conrod small end I.D.:

Service Limit: 16.040 mm (0.6315 in)

09900-20602: Dial gauge (1/1 000 mm, 1 mm)

09900-22401: Small bore gauge (10 – 18 mm)

CONROD BIG END SIDE CLEARANCE

• Inspect the conrod side clearance by using a thickness gauge.

• If the clearance exceeds the service limit, replace crankshaft assembly or bring the deflection and side clearance into specification by replacing the worn parts. (e.g., conrod, big end bearing and crank pin)

Conrod big end side clearance:

Service Limit: 1.0 mm (0.04 in)

09900-20803: Thickness gauge

CYLINDER HEAD, CYLINDER AND PISTON 6-23

6-24 CYLINDER HEAD, CYLINDER AND PISTON

CAM CHAIN, CAM CHAIN TENSIONER AND

CAM CHAIN GUIDE INSTALLATION

Install the cam chain and cam chain tensioner in the reverse order of removal. Pay attention to the following points:

• Install the cam chain tensioner 1 .

Cam chain tensioner bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Install the cam chain 2 to the crankshaft sprocket .

• Insert the cam chain No.1 guide end A into the recess B of the crankcase securely.

• Fit the projection C of the cam chain guide in the groove D of the cylinder.

CAUTION

Make sure that cam chain engages properly to the cam chain drive gear.

• Install the cam chain guide retainer

and tighten the retainer mounting bolt to the specified torque.

Cam chain guide retainer mounting bolt:

10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Install the magneto rotor and magneto cover. (

14-13)

• Install the cylinder head and cylinder head cover.

(

6-27 to -33)

PISTON AND PISTON RING INSTALLATION

Install the piston and piston ring in the reverse order of removal.

Pay attention to the following points:

PISTON RING

• Install the piston rings in the order of oil ring and 1st ring.

• The first member to go into the oil ring groove is a spacer 1 .

After placing the spacer, fit the two side rails 2 .

NOTE:

Side designations, top and bottom, are not applied to the spacer and side rails: you can position each either way.

CAUTION

When installing the spacer 1 , be careful not to allow its two ends to overlap in the groove.

A INCORRECT

B CORRECT

• Install the 1st ring so that the “IR” mark faces up.

CYLINDER HEAD, CYLINDER AND PISTON 6-25

• Position the gaps of the two ring as shown. Before inserting a piston into the cylinder, check that the gaps are so located.

C 1st ring

D Upper side rail

E Spacer

F Lower side rail

IN EX

6-26 CYLINDER HEAD, CYLINDER AND PISTON

PISTON

• Install the piston with the punch mark 1 facing towards the exhaust side.

• Before installing the piston pin, apply MOLYBDENUM OIL

SOLUTION onto its surface.

MOLYBDENUM OIL SOLUTION

• Place a clean rag over the cylinder base to prevent the piston pin circlip from dropping into crankcase. Install the piston pin circlip 2 .

CAUTION

Use a new piston pin circlip 2 to prevent circlip failure.

NOTE:

End gap of the circlip should not be aligned with the cutaway in the piston pin bore.

CYLINDER AND CYLINDER HEAD

INSTALLATION

Install the cylinder and cylinder head in the reverse order of removal. Pay attention to the following points:

CYLINDER

• Thoroughly wipe off oil from the fitting surface of the crankcase.

• Apply SUZUKI BOND to the crankcase as shown.

99000-31110: SUZUKI BOND “1215”

(or equivalent bond)

CYLINDER HEAD, CYLINDER AND PISTON 6-27

• Install the dowel pins into the crankcase and then install the cylinder gasket 1 .

CAUTION

Use a new gasket to prevent oil leakage.

• Apply engine oil to the sliding surface of the piston and cylinder bore.

• Hold each piston ring with the piston ring sections positioned correctly and put it into the cylinder.

• Make sure that the piston rings are caught by the cylinder skirt.

• Place the cylinder on the crankcase.

CAUTION

Do not drop the cam chain into the crankcase.

• Temporarily tighten the cylinder base bolt 2 .

• Insert the cam chain guide end A into the recess B of the crankcase securely.

• Fit the projection C of the cam chain guide 3 in the groove

D of the cylinder.

CAUTION

Make sure that cam chain engages properly to the cam chain drive gear.

6-28 CYLINDER HEAD, CYLINDER AND PISTON

CYLINDER HEAD

• Install the dowel pins into the cylinder and then install the cylinder head gasket

onto the cylinder.

CAUTION

Use a new gasket to prevent gas leakage.

• Place the cylinder head 2 on the cylinder.

CAUTION

Do not drop the cam chain into the crankcase.

• Install the gasket washers to the cylinder head bolts as shown.

CAUTION

The gasket washers should be replaced with new ones to prevent oil leakage.

• Apply engine oil to the washers and thread portion of the bolts before installing the cylinder head bolts.

• With the head snugly seated on the cylinder, secure it by tightening the bolts in diagonal stages.

• Tighten the cylinder head bolts to the specified torque.

Cylinder head bolt: Initial 25 N·m (2.5 kgf-m, 18.0 lb-ft)

Final 50 N·m (5.0 kgf-m, 36.0 lb-ft)

• After tightening the cylinder head bolts to specification, tighten the cylinder head base nuts 3 and cylinder base bolt 4 to the specified torque.

Cylinder head base nut: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

Cylinder base bolt: 12 N·m (1.2 kgf-m, 8.5 lb-ft)

• Install the engine mounting upper brackets. (

5-6)

• Install the exhaust pipe. (

5-8)

• Install the spark plug. (

2-7)

• Install the carburetor. (

12-16)

CYLINDER HEAD, CYLINDER AND PISTON 6-29

CAMSHAFT (AUTOMATIC DECOMP.) AND CAM CHAIN TENSION

ADJUSTER INSTALLATION

Install the camshaft and cam chain tension in the reverse order of removal. Pay attention to the following points:

CAMSHAFT (AUTOMATIC DECOMP.)

• Place a wrench over the crankshaft and turn it counterclockwise to align the TDC mark

with the center of the grooves

B of the timing inspection hole.

CAUTION

Pull the cam chain upward, or the chain will be caught between crankcase and cam drive sprocket.

To adjust the camshaft timing correctly, be sure to align the TDC mark A with the index mark B and hold this position when installing the camshafts.

• Just before installing the camshaft into the cylinder head, apply MOLYBDENUM OIL SOLUTION to the camshaft journals, camshaft journal holders and cam faces. Also, apply engine oil to the camshaft bearings.

MOLYBDENUM OIL SOLUTION

6-30 CYLINDER HEAD, CYLINDER AND PISTON

• Pull the exhaust side of the cam chain taut to install the camshaft sprocket (exhaust side).

• Turn the exhaust camshaft so that the timing mark C is aligned with the gasket surface of the cylinder head. Engage the cam chain with the exhaust camshaft sprocket.

• The other timing marked D should now be pointing straight up. Starting from the roller pin that is directly above the timing marked D , count out 13 roller pins (from the exhaust camshaft side going towards the intake camshaft side).

• Engage the 13 roller pin on the cam chain with the timing marked E on the camshaft sprocket (intake side). Refer to the following illustrations.

NOTE:

The cam chain should now be on all three sprockets. Be careful not to move the crankshaft until the camshaft journal holders and cam chain tension adjuster are secured.

• Install the dowel pins and C-ring 1 .

• Install the camshaft journal holders, intake and exhaust.

NOTE:

* Camshaft journal holders marked “EX” are for the exhaust side and those marked “IN” are for the intake side.

* When tightening the camshaft journal holder bolts, the piston position must be at TDC on the compression stroke.

• Tighten the camshaft journal holder bolts to the specified torque.

NOTE:

Tighten the camshaft journal bolts diagonally.

Camshaft journal holder bolt: 10 N·m

(1.0 kgf-m, 7.0 lb-ft)

CAM CHAIN TENSION ADJUSTER

• Retract the push rod by pushing the stopper 1 .

• Apply SUZUKI SUPER GREASE to the O-ring

CAUTION

Use a new O-ring 2 prevent oil leakage.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Install the cam chain tension adjuster 3 as shown.

• Tighten the cam chain tension adjuster mounting bolts to the specified torque.

Cam chain tension adjuster mounting bolt:

10 N·m (1.0 kgf-m, 7.0 lb-ft)

CYLINDER HEAD, CYLINDER AND PISTON 6-31

Upward

• Install the spring 4 and bar 5 .

• Install the gasket 6 and cam chain tension adjuster cap bolt

7 .

NOTE:

Click sound is heard when the cam chain tension adjuster cap bolt is installed.

• Tighten the cam chain tension adjuster cap bolt to the specified torque.

Cam chain tension adjuster cap bolt:

23 N·m (2.3 kgf-m, 16.5 lb-ft)

CAUTION

After installing the cam chain tension adjuster, check to be sure that the adjuster works properly by checking the slack of cam chain.

6-32 CYLINDER HEAD, CYLINDER AND PISTON

• After installing the cam chain tension adjuster, rotate the crankshaft (two turns), and recheck the positions of the camshafts. (

6-30)

CAUTION

After this procedure, if any resistance is felt while turning over the crankshaft, stop immediately, and check the camshaft chain timing.

• Inspect the valve clearance. (

2-22)

• Apply SUZUKI SUPER GREASE to the O-rings.

CAUTION

Use the new O-rings to prevent oil leakage.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Tighten each plug to the specified torque.

TDC plug: 14 N·m (1.4 kgf-m, 10.0 lb-ft)

Crankshaft hole plug: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

CYLINDER HEAD COVER INSTALLATION

Install the cylinder head cover in the reverse order of removal.

Pay attention to the following points:

• Install the gasket to the cylinder head cover.

CAUTION

Use a new gasket to prevent oil leakage.

• Apply SUZUKI BOND to the end caps of the cylinder head cover gasket as shown.

)

99000-31140: SUZUKI BOND “1207B”

• Place the cylinder head cover on the cylinder head.

• Apply engine oil to both sides of gaskets.

CAUTION

Use the new gaskets to prevent oil leakage.

• Tighten the cylinder head cover bolts to the specified torque.

Cylinder head cover bolt: 14 N·m (1.4 kgf-m, 10.0 lb-ft)

• Install the spark plug and ignition coil/plug cap.

• Install the radiator covers and fuel tank.

• Install the seat.

INSPECTION AFTER INSTALLATION

• Engine oil leakage

• Engine coolant level and coolant leakage (

2-15, -16)

• Fuel leakage (

2-21)

• Exhaust gas leakage

• Throttle cable play (

2-18)

• Clutch lever play (

2-17)

• Wiring harness, cable and hose routing (

19-18 to -23)

CYLINDER HEAD, CYLINDER AND PISTON 6-33

– MEMO –

CLUTCH

CONSTRUCTION ........................................................................................ 7- 2

CLUTCH ................................................................................................ 7- 2

CLUTCH PLATE .......................................................................................... 7- 3

REMOVAL ............................................................................................. 7- 3

INSPECTION ......................................................................................... 7- 4

INSTALLATION ..................................................................................... 7- 6

PRIMARY DRIVEN GEAR AND CLUTCH SLEEVE HUB .......................... 7- 7

REMOVAL ............................................................................................. 7- 7

INSPECTION ......................................................................................... 7- 8

INSTALLATION ..................................................................................... 7- 8

CLUTCH RELEASE CAMSHAFT ............................................................... 7-10

REMOVAL ............................................................................................. 7-10

INSPECTION ......................................................................................... 7-10

INSTALLATION ..................................................................................... 7-11

CLUTCH 7-1

7

7-2 CLUTCH

CONSTRUCTION

CLUTCH

10 N.m

(1.0 kgf-m, 7.0 lb-ft)

90 N.m

(9.0 kgf-m, 65.0 lb-ft)

CLUTCH PLATE

REMOVAL

• Drain engine oil. (

2-12)

• Remove the brake pedal. (

16-18)

• Remove the clutch cover 1 and its gasket.

• Hold the clutch housing with the special tool.

CAUTION

Be careful not to damage the clutch housing or clutch plates.

09920-53740: Clutch sleeve hub holder

• Remove the clutch spring set bolts and clutch springs.

NOTE:

Loosen the clutch spring set bolts little by little and diagonally.

• Remove the pressure plate 2 , bearing 3 and push piece 4 .

• Remove the push rod 5 .

NOTE:

If it is difficult to pull out the push rod 5 , use a magnetic hand or a wire.

CLUTCH 7-3

7-4 CLUTCH

• Remove the clutch drive plates 6 and driven plates 7 .

INSPECTION

DRIVE PLATE

• Measure the drive plate thickness.

Drive plate thickness

Service Limit: 2.42 mm (0.095 in)

09900-20101: Vernier calipers (150 mm)

• Inspect the drive plates for wear, distortion and discoloration.

• If the drive plate thickness is found to have reached the limit, replace it with a new one.

• Measure the drive plate claw width.

• Replace the drive plates found to have worn down to the limit.

Drive plate claw width

Service Limit: 13.05 mm (0.514 in)

09900-20101: Vernier calipers (150 mm)

DRIVEN PLATE

• Measure the driven plate distortion.

Driven plate distortion

Service Limit: 0.10 mm (0.004 in)

09900-20803: Thickness gauge

• Inspect the driven plates for wear and discoloration.

• Replace driven plates which exceed the limit.

CLUTCH SPRING

• Measure the clutch spring free length.

• Replace all the springs if any spring is not within the limit.

NOTE:

Replace five clutch springs together even if only one spring is beyond the service limit.

Clutch spring free length

Service Limit: 43.0 mm (1.69 in)

09900-20101: Vernier calipers (150 mm)

PUSH ROD

• Inspect the push rod for wear and damage.

• If any defects are found, replace the push rod with a new one.

RELEASE BEARING

• Inspect the clutch release bearing for any abnormality, particularly cracks, to decide whether it can be reused or should be replaced.

• Smooth engagement and disengagement of the clutch depends on the condition of this bearing.

CLUTCH 7-5

7-6 CLUTCH

INSTALLATION

Install the clutch plates in the reverse order of removal. Pay attention to the following points:

• Apply engine oil to the drive plates 1 and driven plates 2 .

• Install the push rod and push piece.

• Apply engine oil to the release bearing 3 .

NOTE:

The covered side A of the bearing should face outside.

• Fit the pressure plate.

• Install the clutch springs and clutch spring set bolts.

• Hold the clutch housing with the special tool.

CAUTION

Be careful not to damage the clutch housing or clutch plates.

09920-53740: Clutch sleeve hub holder

• Tighten the clutch spring set bolts to the specified torque.

NOTE:

Tighten the clutch spring set bolts diagonally.

Clutch spring set bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Install the gasket 4 and clutch cover 5 .

CAUTION

Replace the gasket 4 with a new one.

• Tighten the clutch cover bolts diagonally.

Clutch cover bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Install the brake pedal. (

16-18)

INSPECTION AFTER INSTALLATION

• Engine oil level and oil leakage (

2-11)

• Clutch cable play (

2-17)

• Smooth operation of clutch assembly

Outside

PRIMARY DRIVEN GEAR AND CLUTCH

SLEEVE HUB

REMOVAL

• Remove the clutch cover. (

7-3)

• Remove the pressure plate and clutch plates. (

7-3, -4)

• Flatten the lock washer 1 .

• Hold the clutch sleeve hub 2 with the special tool and loosen the nut 3 .

09920-53740: Clutch sleeve hub holder

• Remove the nut 3 , lock washer 1 and clutch sleeve hub 2 .

• Remove the washer 4 and primary driven gear 5 .

• Remove the needle bearing 6 and spacer 7 .

CLUTCH 7-7

7-8 CLUTCH

INSPECTION

• Inspect the clutch sleeve hub and primary driven gear for wear and cracks.

• If necessary, replace the sleeve hub or driven gear.

• Inspect the needle bearing and spacer for damage and wear.

• If any defects are found, replace the bearing or spacer.

INSTALLATION

Install the primary driven gear and clutch sleeve hub in the reverse order of removal. Pay attention to the following points:

• Apply engine oil to the spacer 1 and needle bearing 2 .

• Install the spacer 1 and needle bearing 2 .

• Install the primary driven gear 3 .

• Install the washer 4 .

• Fit the clutch sleeve hub 5 , lock washer 6 and clutch sleeve hub nut 7 .

CAUTION

Replace the lock washer

with a new one.

• Tighten the clutch sleeve hub nut with the special tool to the specified torque.

09920-53740: Clutch sleeve hub holder

Clutch sleeve hub nut: 90 N·m (9.0 kgf-m, 65.0 lb-ft)

• Make sure the clutch sleeve hub for smooth movement.

• Bend the lock washer to secure the nut.

• Reassemble the clutch plates and pressure plate. (

7-6)

• Install the gasket and clutch cover.

CAUTION

Replace the gasket with a new one.

• Tighten the clutch cover bolts diagonally.

Clutch cover bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Install the brake pedal. (

16-18)

INSPECTION AFTER INSTALLATION

• Engine oil level and oil leakage (

2-11)

• Clutch cable play (

2-17)

• Smooth operation of clutch assembly

CLUTCH 7-9

7-10 CLUTCH

CLUTCH RELEASE CAMSHAFT

REMOVAL

• Remove the cam chain tension adjuster. (

6-4)

CAUTION

Do not turn the crankshaft after removing the cam chain tension adjuster.

• Disconnect the clutch cable 1 and remove the retainer 2 .

• Pull the clutch release camshaft 3 out of crankcase.

INSPECTION

CLUTCH RELEASE CAMSHAFT

• Inspect the clutch release camshaft for abnormal deflection and damage.

• If any defects are found, replace the release camshaft with a new one.

OIL SEAL AND BEARING

• Inspect the oil seal for oil leakage and oil seal lip damage.

• Inspect the bearings for play and smooth movement.

• Replace the defective parts with a new one if necessary.

(

10-9 to -12)

INSTALLATION

• Apply SUZUKI MOLY PASTE to the clutch release camshaft.

99000-25140: SUZUKI MOLY PASTE

• Apply engine oil to the oil seal lip.

• Install the clutch release camshaft 1 .

• Connect the clutch cable 2 and install the retainer 3 .

• Install the cam chain tension adjuster. (

6-31)

CLUTCH 7-11

35 (Moving limit)

11 (Clutch release

set position)

INSPECTION AFTER INSTALLATION

• Engine oil level and oil leakage (

2-11)

• Clutch cable play (

2-17)

• Smooth operation of clutch assembly

– MEMO –

KICK STARTER 8-1

KICK STARTER

CONSTRUCTION ........................................................................................ 8- 2

KICK STARTER .................................................................................... 8- 2

KICK STARTER ........................................................................................... 8- 3

REMOVAL ............................................................................................. 8- 3

INSPECTION ......................................................................................... 8- 4

INSTALLATION ..................................................................................... 8- 5

8

8-2 KICK STARTER

CONSTRUCTION

KICK STARTER

10 N·m

(1.0 kgf-m, 7.0 lb-ft)

KICK STARTER

REMOVAL

• Drain engine oil. (

2-12)

• Drain engine coolant. (

13-3)

• Remove the brake pedal. (

16-18)

• Disconnect the radiator hose 1 .

• Remove the kick starter lever 2 .

• Remove the right crankcase cover 3 , dowel pins and gasket.

• Remove the clutch assembly. (

7-7)

• Remove the kick starter idle gear 4 .

• Remove the end of return spring 5 .

• Remove the kick starter shaft assembly 6 .

• Remove the following parts from the kick starter shaft 7 .

Guide 8

Return spring 9

Washer B

Snap ring C

Washer 0

Kick starter drive gear A

Spring D

Kick starter E

09900-06107: Snap ring pliers

KICK STARTER 8-3

8-4 KICK STARTER

• Remove the kick starter guide F .

INSPECTION

• Inspect the oil seal lip for wear and damage.

• If any defects are found, replace the oil seal with a new one.

• Inspect the kick starter drive gear teeth for damage.

• Inspect the kick starter drive gear ratchet part for wear and damage.

• Inspect the kick starter shaft and drive gear for contact surface wear.

• Inspect the return spring for damage.

• Replace the defective parts with a new one if necessary.

• Inspect the kick starter idle gear teeth for wear and damage.

• Inspect the kick starter idle gear and its shaft contact surface for wear and damage.

• If any defects are found, replace the gear with a new one.

INSTALLATION

Install the kick starter in the reverse order of removal. Pay attention to the following points:

• Install the kick starter guide 1 .

Kick starter guide bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Install the kick starter drive gear 2 , washers and snap ring 3 to the kick starter shaft.

CAUTION

Replace the snap ring

with a new one.

09900-06107: Snap ring pliers

• Install the return spring 4 into the kick starter shaft hole.

• Install the guide 5 to the kick starter shaft.

NOTE:

Align the concave A of guide with kick starter shaft hole B .

• Install the kick starter 6 onto the kick starter shaft.

NOTE:

When installing the kick starter 6 , align the wide spline teeth C and

KICK STARTER 8-5

8-6 KICK STARTER

• Install the spring 7 to the kick starter shaft.

• Install the kick starter shaft assembly to the crankcase.

NOTE:

Securely engage the stopper portion E of the kick starter with the stopper guide F .

• Install the end of return spring to the crankcase.

• Install the kick starter idle gear 8 .

8˚

• Reassemble the clutch assembly. (

7-8, -9)

• Install the dowel pins and gasket 9 .

CAUTION

Use a new gasket 9 to prevent oil leakage.

• Install the right crankcase cover 0 .

Right crankcase cover bolt: 11 N·m (1.1kgf-m, 8.0 lb-ft)

• Install the kick starter lever onto the kick starter shaft.

NOTE:

When installing the kick starter lever, align the wide spline teeth

G and H .

• Tighten the kick starter lever bolt to the specified torque.

Kick starter lever bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Install the brake pedal. (

16-18)

• Connect the radiator hose. (

19-23)

INSPECTION AFTER INSTALLATION

• Engine oil level and oil leakage (

2-11)

• Engine coolant level and coolant leakage (

2-15, -16)

• Smooth movement of kick starter

KICK STARTER 8-7

– MEMO –

GEARSHIFTING 9-1

GEARSHIFTING

CONSTRUCTION ........................................................................................ 9- 2

GEARSHIFT LINKAGE ......................................................................... 9- 2

GEARSHIFT LINKAGE ............................................................................... 9- 3

REMOVAL ............................................................................................. 9- 3

INSPECTION ......................................................................................... 9- 5

INSTALLATION ..................................................................................... 9- 5

9

9-2 GEARSHIFTING

CONSTRUCTION

GEARSHIFT LINKAGE

23 N.m

(2.3 kgf-m, 16.5 lb-ft)

24 N.m

(2.4 kgf-m, 17.5 lb-ft)

10 N.m

(1.0 kgf-m, 7.0 lb-ft)

GEARSHIFT LINKAGE

REMOVAL

• Drain engine oil. (

2-12)

• Drain engine coolant. (

13-3)

• Remove the gearshift lever 1 .

NOTE:

Mark the gearshift shaft head at which the gearshift lever slit set for correct reinstallation.

• Remove the right crankcase cover and clutch assembly.

(

7-7, 8-3)

• Remove the magneto cover. (

14-12)

• Remove the primary driven gear and oil pump idle gear.

(

11-4)

• Remove the gearshift shaft 2 and washer 3 .

• Remove the washer 3 , snap ring 4 and return spring 5 from the gearshift shaft 2 .

09900-06107: Snap ring pliers

• Remove the gearshift pawl lifter 6 .

• Remove the gearshift cam driven gear 7 .

NOTE:

Be careful not to drop the pins and springs when removing the gearshift cam driven gear.

GEARSHIFTING 9-3

9-4 GEARSHIFTING

• Remove the gearshift pawls 8 , pins 9 and springs 0 .

• Remove the gearshift cam driven gear pin A and gearshift cam stopper plate B .

• Remove the gearshift cam stopper C , spring D and washer

E .

• Remove the gearshift arm stopper F and washer G .

INSPECTION

• Inspect the gearshift shaft 1 for bends and damage.

• Inspect the return spring 2 for damage.

• Replace the defective parts with a new one if necessary.

• Inspect the pawls 3 , pins 4 and springs 5 for damage.

• Replace the defective parts with a new one if necessary.

INSTALLATION

Install the gearshift in the reverse order of removal. Pay attention to the following points:

• Apply a small quantity of THREAD LOCK SUPER to the gearshift arm stopper bolt 1 and tighten it to the specified torque.

99000-32030: THREAD LOCK SUPER “1303”

Gearshift arm stopper bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Install the washer 2 , spring 3 and gearshift cam stopper 4 .

Shift cam stopper bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Align the pin groove A with the pin B when installing the stopper plate 5 .

GEARSHIFTING 9-5

9-6 GEARSHIFTING

• Apply a small quantity of THREAD LOCK to the gearshift cam driven pin 6 and tighten it to the specified torque.

99000-32050: THREAD LOCK “1342”

Gearshift cam driven pin: 24 N·m (2.4 kgf-m, 17.5 lb-ft)

• Fit the springs 7 , pins 8 and pawls 9 to the gearshift cam driven gear 0 . Wider side C of pawl should be positioned outside.

• With the pawls held in pushed position, install the pawl lifter

A .

• Apply THREAD LOCK SUPER to the pawl lifter screws and tighten them.

99000-32030: THREAD LOCK SUPER “1303”

• Install the gearshift return spring C , snap ring D and washer

E to the gearshift shaft B properly.

CAUTION

Replace the snap ring D with a new one.

NOTE:

When installing the return spring, position the stopper D of gearshift arm between the return spring ends E .

" 09900-06107: Snap ring pliers

• Install the gearshift shaft assembly F .

NOTE:

Pinch the gearshift arm stopper

with return spring ends

• Install the oil pump idle gear and primary drive gear.

(

11-7)

• Install the magneto cover. (

14-14)

• Install the clutch assembly and right crankcase cover.

(

7-8, 8-6)

• Align the mark on the gearshift shaft head with the gearshift lever matching surface.

• Tighten the gearshift lever bolt.

INSPECTION AFTER INSTALLATION

• Engine oil level and oil leakage (

2-11)

• Engine coolant level and coolant leakage (

2-15, -16)

• Smooth operation of gearshift

GEARSHIFTING 9-7

– MEMO –

TRANSMISSION AND CRANKSHAFT 10-1

TRANSMISSION AND CRANKSHAFT

CONSTRUCTION ...................................................................................... 10- 2

TRANSMISSION AND CRANKSHAFT ............................................... 10- 2

ENGINE BOTTOM SIDE ............................................................................ 10- 3

PRIMARY DRIVE GEAR REMOVAL .................................................. 10- 3

CRANKCASE SEPARATION ............................................................. 10- 4

TRANSMISSION REMOVAL .............................................................. 10- 4

CRANKSHAFT REMOVAL ................................................................. 10- 5

REED VALVE REMOVAL ................................................................... 10- 5

TRANSMISSION INSPECTION .......................................................... 10- 6

CONROD INSPECTION ...................................................................... 10- 7

CRANKSHAFT INSPCECTION .......................................................... 10- 8

OIL SEAL INSPECTION ..................................................................... 10- 8

OIL SEAL REMOVAL AND INSTALLATION ..................................... 10- 9

BEARING INSPECTION ..................................................................... 10- 9

BEARING REMOVAL AND INSTALLATION ..................................... 10-10

REED VALVE INSTALLATION ........................................................... 10-13

CRANKSHAFT INSTALLATION ......................................................... 10-13

TRANSMISSION INSTALLATION ...................................................... 10-14

CRANKCASE INSTALLATION ........................................................... 10-16

PRIMARY DRIVE GEAR INSTALLATION .......................................... 10-17

10

10-2 TRANSMISSION AND CRANKSHAFT

CONSTRUCTION

TRANSMISSION AND CRANKSHAFT

90 N.m

(9.0 kgf-m, 65.0 lb-ft)

ENGINE BOTTOM SIDE

• Remove the engine. (

5-2 to -5)

NOTE:

The following parts must be removed before disassembling the engine bottom side (crankcase).

• Disconnect the crankcase breather hose 1 .

• Remove the cylinder head, cylinder and piston. (

6-3 to -6)

• Remove the magneto cover. (

14-12)

• Remove the right crankcase cover and clutch assembly.

(

7-7, 8-3)

• Remove the kick starter idle gear and kick starter shaft.

(

8-3)

PRIMARY DRIVE GEAR REMOVAL

• Hold the crankshaft immovable with the special tool.

09930-44560: Rotor holder

TRANSMISSION AND CRANKSHAFT 10-3

• Remove the primary drive gear nut, washer and primary drive gear 1 .

CAUTION

The primary drive gear nut has left-hand threads.

• Remove the oil pump idle gear and oil pump. (

11-4)

• Remove the gearshift linkage. (

9-3, -4)

• Remove the magneto rotor and key. (

14-13)

• Remove the cam chain guide retainer, cam chain and cam chain tensioner. (

6-7)

10-4 TRANSMISSION AND CRANKSHAFT

CRANKCASE SEPARATION

• Remove the engine sprocket spacer 1 and two O-rings 2 .

• Remove the oil strainer cap 3 and oil strainer (Feed pump side). (

2-14)

• Separate the crankcase with the special tool.

09920-13120: Crankcase separating tool

NOTE:

* Set the crankcase separating tool to the clutch side of the crankcase.

* Separate the crankcase gradually while hitting the crankcase boss and countershaft softly with a plastic hammer.

TRANSMISSION REMOVAL

• Remove the dowel pins 1 and gasket 2 .

• Remove the oil strainer (Scavenge pump side) 3 .

• Remove the gearshift fork shafts 4 .

• Remove the gearshift cam 5 .

• Remove the gearshift forks 6 .

• Remove the countershaft assembly 7 and driveshaft assembly 8 .

TRANSMISSION AND CRANKSHAFT 10-5

CRANKSHAFT REMOVAL

• Remove the crankshaft with the special tool.

CAUTION

Be careful not to damage the thread part of the crankshaft.

09920-13120: Crankcase separating tool

REED VALVE REMOVAL

• Remove the reed valve guide 1 and reed valve 2 .

10-6 TRANSMISSION AND CRANKSHAFT

TRANSMISSION INSPECTION

• Inspect the gear teeth, dogs, and gearshift grooves for abnormal wear and damage.

• Inspect the bushings and splines for abnormal wear and discoloration.

• If necessary, replace defective parts with a new one.

• Inspect the gearshift cam groove for abnormal wear and damage.

• If any defects are found, replace the gearshift cam with a new one.

• Inspect the gearshift forks and shafts for wear and damage.

• If any defects are found, replace the gearshift fork or shaft.

• Measure the gearshift fork to groove clearance with a thickness gauge.

• If the clearance checked is noted to exceed the limit, replace the fork or dog.

Gearshift fork to groove clearance

Service Limit: 0.50 mm (0.020 in)

09900-20803: Thickness gauge

• Measure the gearshift fork thickness with a vernier calipers.

Gearshift fork thickness

Standard: 4.80 – 4.90 mm (0.189 – 0.193 in)

09900-20101: Vernier calipers (150 mm)

• Measure the gearshift fork groove width with a vernier calipers.

Gearshift fork groove width

Standard: 5.00 – 5.10 mm (0.197 – 0.201 in)

09900-20101: Vernier calipers (150 mm)

CONROD INSPECTION

• For conrod inspection other than the following, refer to page

6-23.

• Measure the conrod deflection with the special tools.

Conrod deflection

Service Limit: 3.0 mm (0.12 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block (100 mm)

TRANSMISSION AND CRANKSHAFT 10-7

10-8 TRANSMISSION AND CRANKSHAFT

CRANKSHAFT INSPCECTION

• Measure the crankshaft runout with V-blocks and dial gauge.

NOTE:

Place the crankshaft onto the V-blocks so that it becomes horizontally.

Crankshaft runout

Service Limit: 0.08 mm (0.003 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block (100 mm)

• Measure the crankshaft web to web width with a vernier calipers.

Crank web to web width

Standard: 55.9 – 56.1 mm (2.20 – 2.21 in)

09900-20101: Vernier calipers (150 mm)

OIL SEAL INSPECTION

• Inspect each oil seal lip for wear and damage.

• If any defects are found, replace the oil seal with a new one.

OIL SEAL REMOVAL AND INSTALLATION

• Remove the oil seals ( 1 , 2 , 3 , 4 ) with the special tool.

CAUTION

The removed oil seal should be discard.

09913-50121: Oil seal remover

• Install each new oil seal with the special tool.

09913-70210: Bearing installer set

Oil seal 1 , 4 :

40 Attachment

Oil seal 2 :

22 Attachment

Oil seal 3 :

17 Attachment

• Apply grease to each oil seal lip.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

NOTE:

Be sure to check the direction of the crankshaft bearing oil seal

4 before installing them.

TRANSMISSION AND CRANKSHAFT 10-9

PRIMARY

DRIVE

GEAR

SIDE

BEARING INSPECTION

• Inspect the bearings for play, discoloration, wear and seizure.

• Move the inner race by finger and inspect for smooth movement.

• If it does not move smoothly, replace the bearing with a new one.

10-10 TRANSMISSION AND CRANKSHAFT

BEARING REMOVAL AND INSTALLATION

• Remove the oil seals. (

10-9)

• Remove the bearing retainers.

REMOVAL

CAUTION

The removed bearing should be discard.

• Remove the bearings ( 1 , 3 , 5 , 6 , 7 ) with the special tool.

09913-70210: Bearing installer set

Bearing 1 , 7 :

35 Attachment

Bearing 3 , 5 , 6 :

40 Attachment

• Remove the bearings (

) with the special tool.

09921-20240: Bearing remover set

Bearing 2 , 8 : Remover 17 mm

• Remove the bearing 4 with the special tools.

09923-74511: Bearing puller

09930-30104: Sliding shaft

• Remove the bearings ( 9 , 0 ) with the special tools.

09921-20200: Bearing remover

09930-30104: Sliding shaft

TRANSMISSION AND CRANKSHAFT 10-11

10-12 TRANSMISSION AND CRANKSHAFT

INSTALLATION

• Press the new bearings with the special tool.

09913-70210: Bearing installer set

Bearing

52 Attachment

Bearing 2 ,

Bearing 3 ,

8 :

40 Attachment

6 :

62 Attachment

Bearing

32 Attachment

Bearing 5 :

47 Attachment

Bearing 7 :

42 Attachment

Bearing

15 Attachment

• Press the bearing 0 with the appropriate steel rod.

NOTE:

* Press the bearings ( 2 , 4 , 5 , 8 ) into the crankcase, so that the stamped mark side faces inside of the crankcase.

* Press the bearings ( 9 , 0 ) into the crankcase, so that the stamped mark side faces outside of the crankcase.

NOTE:

* Press the bearings (

and

) into the crankcase, so that the stepped side A faces inside of the crankcase.

* Press the bearing

into the crankcase, so that the sealed side

faces outside of the crankcase.

Inside of the crankcase

Outside of the crankcase

• Apply THREAD LOCK SUPER to the bearing retainer screws.

99000-32030: THREAD LOCK SUPER “1303”

• Install the bearing retainers and tighten their screws.

REED VALVE INSTALLATION

• Install the reed valve 1 and reed valve guide 2 direction as shown.

Reed valve guide bolt: 4.5 N·m (0.45 kgf-m, 3.0 lb-ft)

1 Reed valve

2 Reed valve guide

A Crankcase

CRANKSHAFT INSTALLATION

• Fit the crankshaft into the left crankcase with the special tools.

NOTE:

Use the attachment (inner driver attachment 3 ) for crankshaft bearing inside diameter.

09910-32812: Crankshaft installer

09911-11310: Crankshaft installer attachment

09913-70210: Bearing installer set

(Inner driver attachment 30 mm

)

TRANSMISSION AND CRANKSHAFT 10-13

10-14 TRANSMISSION AND CRANKSHAFT

TRANSMISSION INSTALLATION

CAUTION

The removed snap ring should be replaced with a new one.

Install the snap ring in the groove and locate its end as shown in the illustration.

• Apply engine oil to the following parts: driveshaft, countershaft, transmission gears, bearings.

• Install the driveshaft 1 and countershaft 2 with gears installed.

NOTE:

Install the washers A , B located in both ends of the driveshaft positively.

Thrust

Sharp edge

• Install the gearshift forks 3 , 4 and 5 .

3 For 5th driven gear

4 For sliding dog

5 For 3rd/4th drive gear

TRANSMISSION AND CRANKSHAFT 10-15

• Install the gearshift cam 6 and gearshift shafts 7 .

NOTE:

Turn the gearshift cam to the neutral position and confirm that the driveshaft and countershaft turn without resistance.

• Install the oil strainer (Scavenge pump side) 8 .

10-16 TRANSMISSION AND CRANKSHAFT

CRANKCASE INSTALLATION

• Fit the dowel pins and gasket 1 .

CAUTION

Replace the gasket 1 with a new one.

• Fit the right crankcase on the left crankcase.

• Install the bracket A to the bolt. (

19-24)

• Tighten the crankcase bolts to the specified torque.

Crankcase bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

NOTE:

If it is hard to tighten the bolts, separate the crankcase and confirm that the transmission parts are assembled correctly.

• Install the oil strainer (Feed pump side) and oil strainer cap

2 . (

2-14)

• Inspect the crankshaft, countershaft and driveshaft for smooth movement.

• Apply grease to oil seal lip and O-rings 3 .

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

CAUTION

Replace the O-rings 3 with new ones.

• Fit the O-rings 3 and spacer 4 to the driveshaft.

PRIMARY DRIVE GEAR INSTALLATION

• Install the cam chain, cam chain tensioner and cam chain guide retainer. (

6-24)

• Install the magneto rotor and key. (

14-13)

• Install the gearshift linkage. (

9-5 to -7)

• Install the oil pump and oil pump idle gear. (

11-6, -7)

• Apply grease to the oil seal lip.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Install the primary drive gear

1 and washer

NOTE:

The washer is directional. Assemble the washer

as shown in the illustration.

• Apply THREAD LOCK SUPER to the primary drive gear nut

(

99000-32110: THREAD LOCK SUPER “1322”

(or equivalent thread lock)

• Hold the magneto rotor with the special tool and tighten the primary drive gear nut

to the specified torque.

09930-44560: Rotor holder

Primary drive gear nut: 90 N·m (9.0 kgf-m, 65.0 lb-ft)

TRANSMISSION AND CRANKSHAFT 10-17

• Install the kick idle gear and kick starter shaft. (

8-5, -6)

• Install the clutch assembly and right crankcase cover.

(

7-8, 8-6)

• Install the magneto cover. (

14-14)

• Install the piston, cylinder and cylinder head.

(

6-25 to -33)

• Connect the crankcase breather hose

• Mount the engine. (

5-6 to -8)

– MEMO –

LUBRICATION SYSTEM

LUBRICATION SYSTEM 11-1

ENGINE LUBRICATION SYSTEM ............................................................ 11- 2

ENGINE LUBRICATION SYSTEM CHART ........................................ 11- 2

ENGINE OIL LEVEL INSPECTION ..................................................... 11- 3

ENGINE OIL CHANGE ........................................................................ 11- 3

ENGINE OIL FILTER CHANGE .......................................................... 11- 3

OIL PRESSURE CHECK .................................................................... 11- 3

OIL STRAINERS REMOVAL .............................................................. 11- 3

OIL STRAINERS INSPECTION .......................................................... 11- 3

OIL STRAINERS INSTALLATION ...................................................... 11- 3

OIL SEAL REMOVAL ......................................................................... 11- 3

OIL SEAL INSPECTION ..................................................................... 11- 3

OIL SEAL INSTALLATION ................................................................. 11- 4

OIL PUMP REMOVAL ......................................................................... 11- 4

OIL PUMP INSPECTION ..................................................................... 11- 5

OIL PUMP INSTALLATION ................................................................ 11- 6

11

11-2 LUBRICATION SYSTEM

ENGINE LUBRICATION SYSTEM

ENGINE LUBRICATION SYSTEM CHART

ENGINE OIL LEVEL INSPECTION

(

2-11)

ENGINE OIL CHANGE

(

2-12)

ENGINE OIL FILTER CHANGE

(

2-13)

OIL PRESSURE CHECK

(

2-37)

OIL STRAINERS REMOVAL

(

2-14, 10-4)

OIL STRAINERS INSPECTION

(

2-14)

OIL STRAINERS INSTALLATION

(

2-14, 10-15)

OIL SEAL REMOVAL

• Remove the right crankcase cover. (

8-3)

• Remove the snap ring 1 .

" 09900-06108: Snap ring pliers

• Remove the oil seal.

OIL SEAL INSPECTION

For oil seal inspection other than the following, refer to page 10-8.

• Inspect the oil seal lip for wear and damage.

• If any defects are found, replace the oil seal with a new one.

LUBRICATION SYSTEM 11-3

11-4 LUBRICATION SYSTEM

OIL SEAL INSTALLATION

• Install the oil seal and snap ring 1 .

CAUTION

Replace the oil seal and snap ring 1 with new ones.

" 09913-70210: Bearing installer set

Oil seal:

22 Attachment

09900-06108: Snap ring pliers

• Apply SUZUKI SUPER GREASE to the oil seal lip.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

OIL PUMP REMOVAL

• Drain engine oil. (

2-12)

• Drain engine coolant. (

13-3)

• Remove the brake pedal. (

16-18)

• Remove the kick starter lever and right crankcase cover.

(

8-3)

• Remove the clutch assembly. (

7-7)

• Remove the magneto cover. (

14-12)

• Hold the crankshaft immovable with the special tool.

(

10-3)

09930-44560: Rotor holder

• Remove the primary drive gear nut, washer and primary drive gear

. (

10-3)

• Remove the snap ring 2 , washer 3 and oil pump idle gear

4 .

09900-06107: Snap ring pliers

• Remove the oil pump 5 .

• Remove the following parts from the oil pump.

6 Oil pump No.2 outer rotor A Oil pump No.1 inner rotor

7 Oil pump No.2 inner rotor

8 Pin

Oil pump cover

9 Oil pump plate

0 Oil pump No.1 outer rotor

D Oil pump driven gear shaft

• Remove the dowel pin.

OIL PUMP INSPECTION

• Check the oil pump with each part for any defects or wear.

• Replace the defective parts with a new one.

LUBRICATION SYSTEM 11-5

11-6 LUBRICATION SYSTEM

OIL PUMP INSTALLATION

Install the oil pump in the reverse order of removal. Pay attention to the following points:

• Install the oil pump cover 2 and pin 3 to the oil pump driven gear shaft 1 .

• Fit the slot

of the oil pump No.1 inner rotor

to the pin

CAUTION

Face the punch mark B on inner rotor 4 to the oil pump cover.

• Install the oil pump No.1 outer rotor 5 .

CAUTION

Face the punch mark C on outer rotor 5 to the oil pump cover.

• Apply engine oil to the oil pump drive gear shaft, outer rotor and inner rotor.

• Install the oil pump plate 6 and pin 7 .

• Fit the slot D of the oil pump No.2 inner rotor to the pin 7 .

• Install the oil pump No.2 outer rotor 8 .

CAUTION

Face the punch mark E on outer rotor 8 to the crankcase.

• Apply engine oil to the outer rotor and inner rotor.

• Install the oil pump and tighten the oil pump mounting bolts to the specified torque.

Oil pump mounting bolt: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

• Install the oil pump idle gear 9 , washer and snap ring.

CAUTION

Replace the snap ring with a new one.

09900-06107: Snap ring pliers

• Install the primary drive gear. (

10-17)

• Install the magneto cover. (

14-14)

• Install the clutch assembly. (

7-8, -9)

• Install the right crankcase cover and kick starter lever.

(

8-5 to -8)

• Install the brake pedal. (

16-18)

INSPECTION AFTER INSTALLATION

• Engine oil level and oil leakage (

2-11)

• Engine coolant level and coolant leakage (

2-15, -16)

• Oil pressure (

2-37)

LUBRICATION SYSTEM 11-7

– MEMO –

FUEL SYSTEM 12-1

FUEL SYSTEM

FUEL TANK AND FUEL VALVE ............................................................... 12- 2

CONSTRUCTION ................................................................................ 12- 2

REMOVAL ........................................................................................... 12- 2

CLEANING AND INSPECTION .......................................................... 12- 3

INSTALLATION ................................................................................... 12- 3

CARBURETOR .......................................................................................... 12- 4

CONSTRUCTION ................................................................................ 12- 4

REMOVAL ........................................................................................... 12- 5

DISASSEMBLY ................................................................................... 12- 6

CLEANING .......................................................................................... 12-10

INSPECTION ....................................................................................... 12-10

REASSEMBLY .................................................................................... 12-12

INSTALLATION ................................................................................... 12-16

THROTTLE POSITION SENSOR .............................................................. 12-17

INSPECTION ....................................................................................... 12-17

REMOVAL ........................................................................................... 12-18

INSTALLATION ................................................................................... 12-18

12

12-2 FUEL SYSTEM

FUEL TANK AND FUEL VALVE

CONSTRUCTION

5 N.m

(0.5 kgf-m, 3.5 lb-ft)

REMOVAL

WARNING

Gasoline is highly flammable and explosive.

Keep heat, spark and flame away.

• Remove the seat and radiator covers. (

5-2)

• Remove the fuel tank. (

5-2)

• Drain fuel.

• Remove the fuel valve 1 and fuel hose 2 .

5 N.m

(0.5 kgf-m, 3.5 lb-ft)

6 N.m

(0.6 kgf.m, 4.5 lb-ft)

CLEANING AND INSPECTION

If the fuel strainer is dirty with sediment, fuel will not flow smoothly and loss in engine power may result. Clean the fuel strainer with compressed air.

INSTALLATION

Install the fuel tank and fuel valve in the reverse order of removal. Pay attention to the following points:

CAUTION

Replace the O-ring 1 with a new one to prevent fuel leakage.

• Install the fuel valve and fuel hose.

Fuel valve mounting bolt: 5 N·m (0.5 kgf-m, 3.5 lb-ft)

INSPECTION AFTER INSTALLATION

• Fuel hose routing (

19-21)

• Fuel leakage (

2-21)

FUEL SYSTEM 12-3

12-4 FUEL SYSTEM

CARBURETOR

CONSTRUCTION

Clip

2 Jet needle (J.N.)

Throttle valve

Throttle position sensor

5 Slow air jet (S.A.J)

6 Starter jet

7 Pilot screw

8 Slow jet (S.J.)

9 Main jet (M.J.)

0 Float valve

A Float

B Leak jet

C Throttle stop screw

REMOVAL

WARNING

Gasoline is highly flammable and explosive.

Keep heat, spark and flame away.

• Turn the fuel valve to the OFF position.

• Place a container beneath the drain hose, drain fuel from the float chamber by loosening the drain screw 1 .

• Disconnect the fuel hose 2 .

• Disconnect the throttle position sensor coupler 3 .

• Remove the wire clamp and throttle pulley cover

• Loosen the lock-nuts 5 .

• Remove the throttle cables from the pulley.

• Remove the hot starter cable 6 .

• Loosen the carburetor clamp screws and take out the carburetor from between the intake pipe and air cleaner duct.

CAUTION

After removing the carburetor, cover the intake pipe with clean cloth to prevent dust from entering to the engine.

FUEL SYSTEM 12-5

12-6 FUEL SYSTEM

DISASSEMBLY

• Remove the hot starter valve 1 and spring from the hot starter cable.

• Remove the drain hose and air vent hoses.

NOTE:

Do not remove the throttle position sensor 2 unless it is necessary to replace it.

• Remove the starter valve 3 .

• Remove the top cap 4 and gasket.

• Remove the throttle valve assembly 5 .

• Disassemble the throttle valve assembly.

6 Throttle valve A Spring

7 Bearing

8 Jet needle

Needle set screw

Floating valve

9 Clip

0 Collar

D Seal

• Remove the throttle shaft E with the link arm F , spring G , plastic washer H and steel washer I .

NOTE:

Turn the throttle shaft E counterclockwise while holding down the acceleration pump lever A and clear the stopper B of the pulley from the throttle stop screw C .

FUEL SYSTEM 12-7

• Remove the pilot screw J .

NOTE:

Before removing the pilot screw J , turn it clockwise until it lightly seats and record the number of turns.

• Remove the acceleration pump cover K .

• Remove the spring L , O-rings M and diaphragm N .

12-8 FUEL SYSTEM

• Remove the drain plug O and float chamber P from the carburetor body.

• Remove the and leak jet Q .

• Remove the gasket R and O-ring S .

• Remove the plate form the float chamber.

• Pull out the push rod T of acceleration pump.

• Remove the E-clip, washer and acceleration pump lever U .

• Remove the throttle stop screw V .

• Remove the float pin W .

• Remove the float X with the float valve Y .

• Remove the following parts.

Z Main jet

[ Main nozzle

\ Buffer plate

] Starter jet

^ Slow jet

• Remove the slow air jet a .

FUEL SYSTEM 12-9

12-10 FUEL SYSTEM

CLEANING

WARNING

Some carburetor cleaning chemicals, especially dip-type soaking solutions, are very corrosive and must be handled carefully. Always follow the chemical manufacturer’s instructions on proper use, handling and storage.

• Clean all jets with a spray-type carburetor cleaner and dry them using compressed air.

• Clean all passageways of the carburetor thoroughly – not just the perceived problem area. Clean the passageways in the carburetor body with a spray-type cleaner. If necessary, soak carburetor body in a dip-type cleaning solution to loosen dirt and varnish.

• Dry the carburetor body using compressed air.

CAUTION

Do not use a wire to clean the jets or passageways. If wire is used, the jets and passageways may become damaged.

Replace the removed O-rings with new ones.

INSPECTION

• Inspect the following items for any damage or clogging.

• If any defects are found, replace the defective parts with a new one.

Jet needle Diaphragm

Throttle valve

Float

Main jet

Pilot screw

Springs

Main nozzle

Slow jet

Slow air jet

Hoses

Starter jet

Leak jet

FLOAT VALVE

• Inspect the float valve tip for wear.

• Inspect the float valve rod for smooth movement.

Good Worm

FUEL LEVEL

• Remove the drain hose and then install a proper cap 1 to the carburetor drain.

• Remove the drain screw and than connect the special tool.

09913-14541: Fuel level gauge set

• Hold the carburetor in the proper angle with a stand.

Carburetor set position

Lateral direction: Horizontal

Longitudinal direction: Vertical

• Fill the float chamber with fuel.

• Remove air completely from the fuel level gauge.

• With the level gauge held vertical, lower the gauge slowly and align the datum point A (float chamber mating surface) with the gauge graduation.

• Wait until the fuel level stabilizes.

• Determine the zero point on the gauge graduation and after waiting again for level stabilization, measure the height

B from the datum point A .

Fuel level B : 6.5 mm (0.256 in) above the datum point

NOTE:

The apparent fuel level measured in the level gauge is higher than the actual level in the float chamber because of meniscus effect. [Meniscus is approximately 1 mm (0.039 in).]

Fuel level in gauge

Fuel level in float chamber

FUEL SYSTEM 12-11

12-12 FUEL SYSTEM

FLOAT HEIGHT

• Tilt the carburetor until the float arm B just touches the float valve rod.

• Measure the float height A .

Standard float height: 8 mm (0.31 in)

09900-20101: Vernier calipers (150 mm)

• If necessary, slightly bend the float arm B to change the float height.

• Recheck the fuel level. (

12-11)

REASSEMBLY

Reassemble the carburetor in the reverse order of disassembly.

Pay attention to the following points:

• Make sure that the spring end A is fitted on the pump lever holder

• Hook the return spring

to the acceleration pump lever

• Fit the end of the return spring into the recess on the carburetor body.

• Install the push rod

into the pump lever holder

• Install the throttle stop screw 5 .

• Fit the float chamber.

• Tighten the screws with the hose plates 6 and cable holder

7 .

• Apply THREAD LOCK to the plate mounting screws and tighten them.

99000-32050: THREAD LOCK “1342”

CAUTION

Replace the O-ring and gasket with new ones to prevent fuel leakage.

• Fit the spring 8 .

• Install the diaphragm 9 so that the marks C face outside.

CAUTION

Replace the O-rings with new ones.

• Apply thin coat of the grease to the O-ring.

CAUTION

Replace the O-ring with a new one.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Install the pilot screw 0 .

NOTE:

Turn in the pilot screw 0 until it lightly seats, then back it out the counted number of turns.

Pilot screw: 1 and 1/2 turns back (Reference data)

FUEL SYSTEM 12-13

45˚

12-14 FUEL SYSTEM

• Apply SUZUKI SILICONE GREASE to the throttle shaft.

(

99000-25100: SUZUKI SILICONE GREASE

• Hook the return spring onto the stopper of the throttle pulley.

• Insert the throttle shaft and install the steel washer A , plastic washer B and link arm C .

• Fit the end of the return spring into the recess of the carburetor body.

• Turn the throttle shaft counterclockwise while holding down the acceleration pump lever D and clear the stopper E of the pulley from the throttle stop screw F .

• Reassemble the throttle valve assembly as shown.

NOTE:

Assemble the floating valve so the hole G faces downward.

• Set the link rollers of the throttle link into the slits of the throttle valve.

• Insert the throttle valve assembly.

• Apply THREAD LOCK SUPER to the screw D .

)

99000-32110: THREAD LOCK SUPER “1322”

(or equivalent thread lock)

CAUTION

Replace the gasket with a new one.

• Reassemble the hot start valve E to the hot start cable end.

ACCELERATION PUMP TIMING

If turn the stop screw of the acceleration pump, adjust the acceleration pump timing after assemble the carburetor.

• Select a pin B of the same diameter as the throttle valve height A and insert it under the throttle valve.

Throttle valve height: 4.4 mm (0.173 in)

• Turn in the stop screw C fully.

• Check play of the link lever D .

• Turn the stop screw C counterclockwise gradually until no free play is available on the link lever D .

FUEL SYSTEM 12-15

12-16 FUEL SYSTEM

INSTALLATION

Install the carburetor in the reverse order of removal. Pay attention to the following points:

• Fit the projection on the carburetor body in the depression of the intake pipe.

• Connect the throttle pulling cable 1 and throttle returning cable 2 to the pulley.

• Turn in each throttle cable adjuster fully and locate each outer cable so that the clearance is 1.5 – 2.5 mm (0.06 – 0.10 in).

• Tighten each lock-nut to the specified torque.

Cable adjuster lock-nut: 2.2 N·m (0.22 kgf-m, 1.60 lb-ft)

• Adjust the throttle cable play. (

2-18)

INSPECTION AFTER INSTALLATION

• Wiring harness, cable and hose routing (

19-18 to -23)

• Fuel leakage (

2-21)

• Throttle cable play (

2-18)

• Engine idle speed (

2-20)

1.5 – 2.5 mm (0.06 – 0.10 in)

FUEL SYSTEM 12-17

THROTTLE POSITION SENSOR

INSPECTION

THROTTLE POSITION SENSOR INPUT VOLTAGE

• Remove the right radiator cover. (

5-2)

• Disconnect the throttle position sensor coupler 1 .

• Shift the transmission into neutral.

• Start the engine.

• Measure the throttle position sensor input voltage using the multi circuit tester.

Throttle position sensor input voltage:

B/G ( + probe) – B/Br ( probe):

4.5 – 5.5 V (2 100 r/min)

09900-25008: Multi-circuit tester set

Tester knob indication: Voltage (

)

• If the voltage is not within the specified value, replace the CDI unit.

THROTTLE POSITION SENSOR COIL RESISTANCE

• Measure the throttle position sensor coil resistance using the multi circuit tester.

Throttle position sensor total of resistance:

4 – 6 k

Ω

(Bl – B)

Throttle position sensor resistance:

When the throttle fully closed: 0.6 – 1.0 k

Ω

(Y – B)

When the throttle fully opened: 3.2 – 5.0 k

Ω

(Y – B)

09900-25008: Multi-circuit tester set

Tester knob indication: Resistance (

Ω

)

• If the resistance is not within the specified value, replace the throttle position sensor assembly.

B/Bl

B/Br

TP sensor coupler (Harness side)

Bl Y

B/G

TP sensor coupler (Carburetor side)

12-18 FUEL SYSTEM

REMOVAL

• Remove the carburetor. (

12-5)

• Remove the throttle position sensor using the special tool.

09930-11950: Torx wrench (T25)

INSTALLATION

• With the throttle valve fully closed, install the throttle position sensor.

NOTE:

Align the throttle shaft end A with the groove B of throttle position sensor.

• Adjust the throttle position sensor until resistance comes to specification and tighten the mounting screw.

NOTE:

Make sure the throttle valve open or close smoothly.

Throttle position sensor total of resistance:

4 – 6 k Ω (Bl – B)

Throttle position sensor resistance:

When the throttle fully closed: 0.6 – 1.0 k

Ω

(Y – B)

When the throttle fully opened: 3.2 – 5.0 k Ω (Y – B)

09900-25008: Multi-circuit tester set

09930-11950: Torx wrench (T25)

Tester knob indication: Resistance ( Ω )

• Install the carburetor. (

12-16)

COOLING SYSTEM 13-1

COOLING SYSTEM

CONSTRUCTION ...................................................................................... 13- 2

ENGINE COOLANT ................................................................................... 13- 3

REPLACEMENT .................................................................................. 13- 3

COOLING CIRCUIT ................................................................................... 13- 4

INSPECTION ....................................................................................... 13- 4

RADIATOR ................................................................................................ 13- 5

REMOVAL ........................................................................................... 13- 5

INSPECTION ....................................................................................... 13- 5

INSTALLATION ................................................................................... 13- 5

WATER PUMP ........................................................................................... 13- 6

REMOVAL ........................................................................................... 13- 6

INSPECTION ....................................................................................... 13- 7

INSTALLATION ................................................................................... 13- 8

13

13-2 COOLING SYSTEM

CONSTRUCTION

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

6 N.m

(0.6 kgf-m, 4.5 lb-ft)

ENGINE COOLANT

REPLACEMENT

WARNING

Engine coolant may be harmful if swallowed or if it comes in contact with the skin or eyes. If engine coolant gets into the eyes or contacts the skin, flush the eyes or wash the skin thoroughly, with plenty of water.

If engine coolant is swallowed, induce vomiting and call a physician immediately.

Do not open the radiator cap when the engine is hot, as you may be injured by escaping hot liquid or vapor.

• Open the radiator cap.

• Remove the drain bolt 1 and drain engine coolant.

• Tighten the drain bolt 1 .

CAUTION

Use a new gasket washer to prevent engine coolant leakage.

Engine coolant drain bolt: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

• Pour specified engine coolant up to the bottom of filler hole.

(

2-15)

Engine coolant capacity: 950 ml (1.0/0.8 US/Imp qt)

• Bleed air from the air bleeder bolt

• Tighten the air bleeder bolt 2 .

• Add engine coolant up to the radiator inlet.

• Tighten the radiator cap securely.

• After warming up and cooling down the engine, add engine coolant.

COOLING SYSTEM 13-3

13-4 COOLING SYSTEM

COOLING CIRCUIT

INSPECTION

• Remove the radiator cap.

WARNING

If engine coolant is swallowed, induce vomiting and call a physician immediately.

Do not open the radiator cap when the engine is hot, as you may be injured by escaping hot liquid or vapor.

• Connect the tester 1 to the filler.

• Give a pressure of about 120 kPa (1.2 kgf/cm 2 , 17.0 psi) and see if the system holds this pressure for 10 seconds.

• If the pressure would fall during this 10-second interval, it means that there is a leaking point in the system. In such a case, inspect the entire system and replace the leaking component or part.

WARNING

When removing the radiator cap tester, put a rag on the filler to prevent spouting of engine coolant.

CAUTION

Do not allow the pressure to exceed the radiator cap release pressure, or the radiator can be damaged.

RADIATOR

REMOVAL

WARNING

If engine coolant is swallowed, induce vomiting and call a physician immediately.

The engine must be cool before servicing the cooling system.

• Remove the seat, radiator covers and fuel tank. (

5-2)

• Drain engine coolant. (

13-3)

• Remove the radiator hoses.

• Remove the radiator louvers 1 , left and right.

• Remove the radiators, left and right.

INSPECTION

RADIATOR

• Visually inspect the radiators and hose for damage.

• Fins bent down or dented can be repaired by straightening them with the blade of a small screwdriver.

RADIATOR CAP

• Fit the cap to the radiator cap tester.

• Build up pressure slowly by operating the tester. Make sure that the pressure build-up stops at 95 – 125 kPa (0.95 – 1.25

kgf/cm 2 , 14 – 18 psi) and that, with the tester held standstill, the cap is capable of holding that pressure for at least 10 seconds.

• Replace the cap if it is found not to satisfy either of these two requirements.

Radiator cap valve release pressure

Standard: 95 – 125 kPa

(0.95 – 1.25 kgf/cm 2 , 14 – 18 psi)

INSTALLATION

Install the radiators in the reverse order of removal.

• Rout the radiator hose correctly. (

19-23)

• Inspect the engine coolant level and leakage. (

2-15, -16)

COOLING SYSTEM 13-5

13-6 COOLING SYSTEM

WATER PUMP

REMOVAL

WARNING

If engine coolant is swallowed, induce vomiting and call a physician immediately.

The engine must be cool before servicing the cooling system.

WATER PUMP CASE

• Drain engine oil. (

2-12)

• Drain engine coolant by removing the drain bolt 1 .

• Disconnect the radiator hose 2 .

• Remove the water pump case 3 .

• Remove the dowel pins

, spring

and oil filter

CRANKCASE COVER

• Remove the brake pedal. (

16-18)

• Remove the kick starter lever. (

8-3)

• Remove the right crankcase cover 1 .

IMPELLER AND GEAR SHAFT

• Hold the water pump shaft 1 with a wrench and remove the impeller 2 .

• Remove the washer

and water pump shaft

• Remove the oil seal.

CAUTION

Replace the removed oil seal with a new one.

NOTE:

If there is no abnormal condition, the oil seal removal is not necessary.

INSPECTION

IMPELLER AND WATER PUMP SHAFT

• Inspect the impeller and water pump shaft for damage.

• Replace the defective parts with a new one if necessary.

COOLING SYSTEM 13-7

13-8 COOLING SYSTEM

OIL SEAL

• Visually inspect the oil seal for damage.

• If any defects are found, replace the oil seal with a new one.

INSTALLATION

Install the water pump in the reverse order of removal. Pay attention to the following points:

OIL SEAL

• Apply THREAD LOCK SUPER to the outer surface of the oil seal.

99000-32110: THREAD LOCK SUPER “1322”

(or equivalent thread lock)

• Press the oil seal with the suitable size socket wrench.

• Apply a small quantity of the SUZUKI SUPER GREASE to the oil seal lips.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

IMPELLER AND WATER PUMP SHAFT

• Hold the water pump shaft with a wrench and tighten the impeller to the specified torque.

Impeller: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

CRANKCASE COVER

• Install the dowel pins and gasket 1 .

CAUTION

Use a new gasket to prevent engine oil leakage.

• Fit the right crankcase cover.

• Tighten the right crankcase cover bolts to the specified torque.

Right crankcase cover bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Install the brake pedal. (

16-18)

• Install the kick starter lever. (

8-7)

WATER PUMP CASE

• Install the dowel pins and oil filter 1 .

• Apply engine coolant to the gasket 2 .

• Install the gasket 2 and spring 3 .

CAUTION

Use a new gasket to prevent engine oil/coolant leakage.

• Fit the water pump case.

• Tighten the water pump case bolts and drain bolt to the specified torque.

CAUTION

Use new gasket washer A to prevent engine coolant leakage.

Water pump case bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

Engine coolant drain bolt: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

• Connect the radiator hose and pour engine coolant.

(

19-23)

INSPECTION AFTER INSTALLATION

• Engine oil level and leakage (

2-11)

• Engine coolant level and leakage (

2-15, -16)

COOLING SYSTEM 13-9

– MEMO –

ELECTRICAL SYSTEM

ELECTRICAL SYSTEM 14-1

CAUTIONS IN SERVICING ....................................................................... 14- 2

CONNECTOR ...................................................................................... 14- 2

COUPLER ........................................................................................... 14- 2

SEMI-CONDUCTOR EQUIPPED PART ............................................. 14- 2

USING THE MULTI-CIRCUIT TESTER .............................................. 14- 2

SWITCH ............................................................................................... 14- 2

LOCATION OF ELECTRICAL COMPONENTS ........................................ 14- 3

CONSTRUCTION ...................................................................................... 14- 4

ELECTRICAL SYSTEM ...................................................................... 14- 4

ELECTRICAL CIRCUIT ....................................................................... 14- 4

TROUBLESHOOTING ........................................................................ 14- 5

IGNITION SYSTEM .................................................................................... 14- 7

IGNITION SYSTEM PEAK VOLTAGE INSPECTION ......................... 14- 7

IGNITION SYSTEM COIL INSPECTION ............................................. 14- 8

IGNITION COIL PRIMARY PEAK VOLTAGE INSPECTION .................... 14- 9

IGNITION COIL/PLUG CAP INSPECTION ......................................... 14-10

ENGINE STOP SWITCH INSPECTION .............................................. 14-11

MAGNETO ROTOR ................................................................................... 14-12

REMOVAL ........................................................................................... 14-12

INSTALLATION ................................................................................... 14-13

STATOR ..................................................................................................... 14-14

REMOVAL ........................................................................................... 14-14

INSTALLATION ................................................................................... 14-14

14

14-2 ELECTRICAL SYSTEM

CAUTIONS IN SERVICING

CONNECTOR

• When connecting a connector, be sure to push it in until a click is felt.

• Inspect the connector for corrosion, contamination and breakage in its cover.

Click

COUPLER

• With a lock type coupler, be sure to release the lock when disconnecting, and push in fully to engage the lock when connecting.

• When disconnecting the coupler, be sure to hold the coupler itself and do not pull the lead wires.

• Inspect each terminal on the coupler for being loose or bent.

• Inspect each terminal for corrosion and contamination.

SEMI-CONDUCTOR EQUIPPED PART

• Be careful not to drop the part with a semi-conductor built in such as a CDI.

• When inspecting this part, follow inspection instruction strictly.

Neglecting proper procedure may cause damage to this part.

USING THE MULTI-CIRCUIT TESTER

• Properly use the multi-circuit tester + and probes.

Improper use can cause damage to the motorcycle and tester.

• If the voltage and current values are not known, begin measuring in the highest range.

• When measuring the resistance, make sure that no voltage is applied. If voltage is applied, the tester will be damaged.

• After using the tester, be sure to turn the switch to the OFF position.

09900-25008: Multi-circuit tester set

Multi-circuit tester set

CAUTION

Before using the multi-circuit tester, read its instruction manual.

SWITCH

• Never apply grease material to switch contact points to prevent damage.

Click

LOCATION OF ELECTRICAL COMPONENTS

ELECTRICAL SYSTEM 14-3

1 Engine stop switch

Ignition coil/plug cap

Throttle position sensor

4 CDI unit

Pick-up coil

Magneto

14-4 ELECTRICAL SYSTEM

CONSTRUCTION

ELECTRICAL SYSTEM

4.5 N.m

(0.45 kgf-m, 3.25 lb-ft)

80 N.m

(8.0 kgf-m, 58.0 lb-ft)

10 N.m

(1.0 kgf-m, 7.0 lb-ft)

ELECTRICAL CIRCUIT

Magneto

Engine stop switch

Throttle position sensor

CDI unit

Ignition coil/plug cap

B/W

Spark plug

WIRE COLOR:

G: Green

R: Red

Y: Yellow

B/Bl: Black with Blue tracer

B/Br: Black with Brown tracer

B/G: Black with Green tracer

B/R: Black with Red tracer

B/W: Black with White tracer

B/Y: Black with Yellow tracer

R/W: Red with White tracer

W/Bl: White with Blue tracer

ELECTRICAL SYSTEM 14-5

TROUBLESHOOTING

No spark or poor spark

Step 1

1) Check the ignition system couplers for poor connections.

Is there connection in the ignition system couplers?

YES

Go to Step 2.

Poor connection of couplers

Step 2

1) Measure the ignition coil primary peak voltage. (

14-9)

Is the peak voltage OK?

YES

Go to Step 3.

Go to Step 4.

Step 3

1) Inspect the spark plug. (

2-7, -8)

Is the spark plug OK?

YES

• Poor connection of the spark plug

• Go to Step 4.

Faulty spark plug

Step 4

1) Measure the ignition coil/plug cap resistance. (

14-10)

Is the ignition coil/plug cap resistance OK?

YES

Go to Step 5.

Faulty ignition coil/plug cap

Step 5

1) Measure the pick-up coil peak voltage. (

14-7)

Is the peak voltage OK?

YES

Go to Step 7.

Go to Step 6.

Step 6

1) Measure the pick-up coil resistance. (

14-8)

Is the resistance OK?

YES

Go to Step 7.

• Faulty pick-up coil

• Metal particles or foreign material being stuck on the pick-up coil and rotor tip

14-6 ELECTRICAL SYSTEM

Step 7

1) Measure the exciter coil and charge coil peak voltages. (

14-7)

Are the peak voltages OK?

YES

Go to Step 9.

Go to Step 8.

Step 8

1) Check the stator.

Is the stator OK?

YES

Go to Step 9.

Faulty stator

Step 9

1) Measure the engine stop switch resistance. (

14-11)

Is the resistance OK?

YES

• Faulty CDI unit

• Open or short circuit in wire harness

Faulty engine stop switch

ELECTRICAL SYSTEM 14-7

IGNITION SYSTEM

IGNITION SYSTEM PEAK VOLTAGE

INSPECTION

• Disconnect the magneto lead wire coupler 1 .

• Connect the multi-circuit tester with peak volt adaptor as shown.

• Measure the highest peak voltage by depressing the kick starter lever several times forcefully.

Stator coil peak voltage

Exciter

Charge

+ Black/Red – Red/White 25 V and more

+ Yellow – Black/White 8 V and more

Pick-up coil peak voltage

Pick-up

Red –

Green

09900-25008: Multi-circuit tester set

Tester knob indication: Voltage (

)

2 V and more

If the peak voltage is below the specification, the cause may lie in the stator coil or pick up coil. (

14-8)

If the peak voltage is above the specification, check the continuity between the magneto lead wire coupler and CDI unit coupler.

(

19-17)

CAUTION

Normally, use the needle pointed probe to the backside of the lead wire coupler to prevent the terminal bend and terminal alignment.

09900-25009: Needle pointed probe set

R/W

B/R

B/W R

R/W B/R B/W

G R

14-8 ELECTRICAL SYSTEM

IGNITION SYSTEM COIL INSPECTION

• Disconnect the magneto lead wire coupler 1 .

• Measure the exciter, charge and pick-up coils resistance.

Stator coil resistance

Exciter

Charge

Black/Red – Red/White

Yellow – Black/White

Pick-up coil resistance

24 – 42

1.6 – 3.2

Ω

Pick-up Red – Green

09900-25008: Multi-circuit tester set

Tester knob indication: Resistance (

Ω

)

72 – 127

Ω

If the resistance is not within the standard range, replace the stator assembly with a new one.

IGNITION COIL PRIMARY PEAK

VOLTAGE INSPECTION

• Remove the seat, radiator covers and fuel tank. (

5-2)

• Disconnect the ignition coil/plug cap lead wire coupler before removing the ignition coil/plug cap.

• Remove the ignition coil/plug cap 1 .

CAUTION

Do not remove the ignition coil/plug cap before disconnecting the lead wire coupler, or the lead wire will be damaged.

Do not pry up the ignition coil/plug cap with a screwdriver or a bar to avoid damage.

Be careful not to drop the ignition coil/plug cap as it may open or short in a circuit.

• Connect a new spark plug to the ignition coil/plug cap.

• Connect the ignition coil/plug cap lead wire coupler to the ignition coil/plug cap, and ground it to the cylinder head.

CAUTION

Avoid grounding the spark plug and suppling the electrical shock to the cylinder head cover (magnesium parts) to prevent the magnesium material from damage.

NOTE:

Be sure that all couplers and spark plug are connected properly.

ELECTRICAL SYSTEM 14-9

14-10 ELECTRICAL SYSTEM

• Insert the needle pointed probe A to the lead wire coupler.

NOTE:

Use the special tool (needle pointed probe), to prevent the rubber of the water proof coupler from damage.

• Measure the ignition coil primary peak voltage by depressing the kick starter lever several times forcefully.

WARNING

Do not touch the tester probes and spark plugs to prevent an electric shock while testing.

Ignition coil primary peak voltage

+ Ground – White/Blue 140 V and more

09900-25008: Multi-circuit tester set

09900-25009: Needle pointed probe set

Tester knob indication: Voltage (

)

If the peak voltage is lower than the standard range, check the ignition coil/plug cap as follow.

IGNITION COIL/PLUG CAP INSPECTION

• Remove the seat, radiator covers and fuel tank. (

5-2)

• Disconnect the ignition coil/plug cap lead wire coupler, and then remove the ignition coil/plug cap. (

14-9)

• Measure the ignition coil/plug cap resistance.

Ignition coil/plug cap resistance

Primary + terminal – terminal

Secondary Plug cap – + terminal

0.07 – 0.6

Ω

4.8 – 7.1 k Ω

09900-25008: Multi-circuit tester set

Tester knob indication: Resistance ( Ω )

If the resistance is not within the standard range, replace the ignition coil/plug cap with a new one.

Peak volt adaptor

CDI unit

IG. coil

To engine stop swicth

ELECTRICAL SYSTEM 14-11

ENGINE STOP SWITCH INSPECTION

• Remove the seat, radiator covers and fuel tank. (

5-2)

• Disconnect the engine stop switch lead wire coupler 1 .

• Measure the engine stop switch resistance between Black/

Yellow lead wire and Black/White lead wire.

Engine stop switch resistance

OFF

Black/Yellow –

Black/White

Black/Yellow –

Black/White

∞

09900-25008: Multi-circuit tester set

Tester knob indication: Resistance (

Ω

)

Under 1

Ω

(Infinity)

If the measurement is out of the specification, the cause may lie in the engine stop switch.

If the measurement is within the specification, check the continuity between the engine stop switch coupler and CDI unit coupler.

(

19-20)

CAUTION

Normally, use the needle pointed probe to the backside of the lead wire coupler to prevent the terminal bend and terminal alignment.

09900-25009: Needle pointed probe set

B/Y B/W

14-12 ELECTRICAL SYSTEM

MAGNETO ROTOR

REMOVAL

• Drain engine oil. (

2-12)

• Disconnect the magneto lead wire coupler 1 and clamp.

• Remove the gearshift lever. (

9-3)

• Remove the magneto cover 2 .

• Remove the gasket 3 and dowel pins.

• Remove the magneto rotor nut 4 with the special tool.

09930-44560: Rotor holder

• Remove the magneto rotor with the special tool.

09930-35020: Rotor remover

• Remove the magneto rotor key 5 .

INSTALLATION

• Remove any grease from the tapered portion A of the magneto rotor and crankshaft B .

• Fit the magneto rotor key 1 into the crankshaft.

• Install the magneto rotor.

• Tighten the magneto rotor nut to the specified torque with the special tool.

09930-44560: Rotor holder

(

Magneto rotor nut: 80 N·m (8.0 kgf-m, 58.0 lb-ft)

• Install the dowel pins and gasket 2 .

CAUTION

Replace the gasket

2 with a new one.

ELECTRICAL SYSTEM 14-13

14-14 ELECTRICAL SYSTEM

• Install the magneto cover 3 .

NOTE:

Fit the bracket to the bolt C .

(

Magneto cover bolt: 11 N·m (1.1 kgf-m, 8.0 lb-ft)

• Install the gearshift lever. (

9-7)

• Pour engine oil. (

2-12)

STATOR

REMOVAL

• Remove the magneto cover. (

14-12)

• Remove the stator 1 .

• Remove the clamp 2 and pick-up coil 3 .

• Remove the grommet 4 .

INSTALLATION

• Fit the stator, pick-up coil, clamp and grommet. (

19-25)

• Apply THREAD LOCK to the stator coil mounting bolts and tighten them to the specified torque.

)

99000-32050: THREAD LOCK “1342”

(

Stator coil mounting bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Tighten the pick-up coil mounting bolts to the specified torque.

NOTE:

First tighten the bolt A as shown.

(

Pick-up coil mounting bolt:

4.5 N·m (0.45 kgf-m, 3.25 lb-ft)

• Install the magneto cover. (

14-14)

FRONT AND REAR WHEELS 15-1

FRONT AND REAR WHEELS

CONSTRUCTION ...................................................................................... 15- 2

FRONT WHEEL ......................................................................................... 15- 3

REMOVAL ........................................................................................... 15- 3

INSPECTION ....................................................................................... 15- 3

DUST SEAL AND BEARING REPLACEMENT .................................. 15- 4

DISC PLATE REPLACEMENT ........................................................... 15- 5

INSTALLATION ................................................................................... 15- 6

REAR WHEEL ........................................................................................... 15- 7

REMOVAL ........................................................................................... 15- 7

INSPECTION ....................................................................................... 15- 8

DUST SEAL AND BEARING REPLACEMENT .................................. 15- 8

DISC PLATE REPLACEMENT ........................................................... 15-10

REAR SPROCKET REPLACEMENT ................................................. 15-10

INSTALLATION ................................................................................... 15-11

REAR WHEEL SPOKES REPLACEMENT ........................................ 15-11

15

15-2 FRONT AND REAR WHEELS

CONSTRUCTION

100 N.m

(10.0 kgf-m, 72.5 lb-ft)

25 N.m

(2.5 kgf-m, 18.0 lb-ft)

30 N.m

(3.0 kgf-m, 21.5 lb-ft)

FWD

12 N.m

(1.2 kgf-m, 8.5 lb-ft)

35 N.m

(3.5 kgf-m, 25.5 lb-ft)

FRONT WHEEL

REMOVAL

• Remove the front axle nut 1 .

• Loosen the left axle holder bolts 2 .

• Place the motorcycle on a block to lift front wheel off the ground.

• Loosen the right axle holder bolts 3 .

• Remove the front axle 4 .

• Remove the front wheel.

INSPECTION

SPACER AND DUST SEAL

• Remove the wheel spacers from the front wheel.

• Inspect the right and left wheel spacers 1 and dust seals 2 for wear and cracks.

• If any defects are found, replace the spacer together with the dust seal.

NOTE:

Apply grease to the spacer and dust seal before reassembling.

FRONT AXLE

• Support the axle shaft with the V-blocks and measure the axle shaft runout.

• If the runout exceeds the limit, replace the axle shaft with a new one.

Front axle runout

Service Limit: 0.25 mm (0.010 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block set (100 mm)

FRONT AND REAR WHEELS 15-3

15-4 FRONT AND REAR WHEELS

WHEEL RIM

• Measure the wheel rim runout with the dial gauge.

• If the runout exceeds the limit, replace the bearings or wheel.

Service Limit: 2.0 mm (0.08 in) ... axial and radial

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

WHEEL BEARING

• Turn the inner race by finger and inspect it for smooth movement.

• Inspect for bearing damage.

• If any defects are found, replace the bearing with a new one.

DUST SEAL AND BEARING REPLACEMENT

• Remove the dust seals with the special tool.

09913-50121: Oil seal remover

CAUTION

The removed dust seals must be replaced with new ones.

• Remove the bearings with the special tool.

09921-20240: Bearing remover set (Remover 20 mm)

CAUTION

The removed bearings must be replaced with new ones.

• Remove the spacer.

FRONT AND REAR WHEELS 15-5

• Install the bearings with the special tool, using the suitable spacer A match for the outside dimension of bearings.

09924-84510: Bearing installer set

NOTE:

* Install the left side (disc side) bearing first and then the right side bearing.

* After installing the bearings, inspect the bearings for smooth movement.

Left

• Install the dust seals and apply grease to their lips.

NOTE:

When installing the dust seal, place the manufacturer’s code indicated side of the dust seal outside.

09913-70210: Bearing installer set

Bearing:

40 Attachment

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

DISC PLATE REPLACEMENT

• Remove the disc plate.

• Apply THREAD LOCK SUPER to the bolts.

99000-32130: THREAD LOCK SUPER “1360”

• Tighten the bolts to the specified torque.

Disc plate bolt: 12 N·m (1.2 kgf-m, 8.5 lb-ft)

Clearance

Right

15-6 FRONT AND REAR WHEELS

INSTALLATION

• Hold the front axle shaft with the special tool and tighten the front axle nut temporarily.

09940-34581: Attachment (F)

• Remove the block from under the chassis tube and move the front forks up and down several times.

• Tighten the front axle nut to the specified torque.

Front axle nut: 35 N·m (3.5 kgf-m, 25.5 lb-ft)

• Tighten the left and right axle holder bolts to the specified torque.

Axle holder bolt: 18 N·m (1.8 kgf-m, 13.0 lb-ft)

REAR WHEEL

REMOVAL

• Loosen the rear axle nut 1 .

• Place the motorcycle on a block to lift the rear wheel off the ground.

• Remove rear axle nut 1 and washer 2 .

• Remove the rear axle shaft 3 and chain adjuster washers 4 .

FRONT AND REAR WHEELS 15-7

• Disengage the drive chain 5 .

• Remove the rear wheel 6 .

15-8 FRONT AND REAR WHEELS

INSPECTION

WHEEL SPACER

• Remove the wheel spacers from the rear wheel.

• Inspect the rear wheel spacers 1 and dust seals 2 for wear and cracks.

• If any defects are found, replace the spacer together with the dust seal.

NOTE:

Apply grease on the spacer and dust seal before reassembling.

SPROCKET

• Inspect the sprocket teeth for wear.

• If they are worn as shown, replace the two sprockets and drive chain as a set.

AXLE SHAFT (

15-3)

WHEEL RIM (

15-4)

WHEEL BEARING (

15-4)

DUST SEAL AND BEARING REPLACEMENT

• Remove the dust seals with the special tool.

CAUTION

The removed dust seals must be replaced with new ones.

09913-50121: Oil seal remover

• Remove the snap ring

CAUTION

The removed snap ring must be replaced with a new one.

09900-06108: Snap ring pliers

Normal wear Excessive wear

• Remove the bearings with the special tool.

09921-20240: Bearing remover set (Remover 25 mm)

CAUTION

The removed bearings must be replaced with new ones.

• Remove the spacer.

FRONT AND REAR WHEELS 15-9

• Install the bearings with the special tool, using the suitable spacer A match for the outside dimension of bearings.

09941-34513: Steering race installer

NOTE:

* Install the left side (sprocket side) bearing first and then the right side bearing.

* After installing the bearings, inspect the bearings for smooth movement.

Clearance

Left

Spacer

Right

• Install the snap ring.

09900-06108: Snap ring pliers

15-10 FRONT AND REAR WHEELS

• Install the dust seals and apply grease to their lips.

NOTE:

When installing the dust seal, place the manufacturer’s code indicated side of the dust seal outside.

09913-70210: Bearing installer set

Oil seal:

42 Attachment

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

DISC PLATE REPLACEMENT

• Remove the disc plate.

• Apply THREAD LOCK SUPER to the bolts.

99000-32130: THREAD LOCK SUPER “1360”

• Tighten the bolts to the specified torque.

Disc plate bolt: 25 N·m (2.5 kgf-m, 18.0 lb-ft)

REAR SPROCKET REPLACEMENT

• Remove the rear sprocket.

NOTE:

Install the rear sprocket as the letter on the sprocket surface faces outside.

• Tighten the nuts to the specified torque.

Rear sprocket nut: 30 N·m (3.0 kgf-m, 21.5 lb-ft)

INSTALLATION

• Install the rear wheel, chain adjuster washers and axle shaft.

• Adjust the drive chain slack. (

2-28)

FRONT AND REAR WHEELS 15-11

Left

FWD

Right

Chain adjuster washer

• Tighten the rear axle nut to the specified torque.

Rear axle nut: 90 N·m (9.0 kgf-m, 65.0 lb-ft)

REAR WHEEL SPOKES REPLACEMENT

(

19-30)

– MEMO –

FRONT AND REAR BRAKES 16-1

FRONT AND REAR BRAKES

CONSTRUCTION ...................................................................................... 16- 2

BRAKE FLUID AIR BLEEDING ................................................................ 16- 3

BRAKE FLUID REPLACEMENT ............................................................... 16- 4

BRAKE PADS REPLACEMENT ............................................................... 16- 5

FRONT BRAKE PADS ........................................................................ 16- 5

REAR BRAKE PADS .......................................................................... 16- 5

BRAKE DISC INSPECTION ...................................................................... 16- 6

CALIPER .................................................................................................... 16- 6

FRONT CALIPER REMOVAL AND DISASSEMBLY ......................... 16- 7

CALIPER INSPECTION ...................................................................... 16- 8

CALIPER CLEANING ......................................................................... 16- 8

FRONT CALIPER REASSEMBLY AND INSTALLATION .................. 16- 8

REAR CALIPER REMOVAL AND DISASSEMBLY ........................... 16- 9

REAR CALIPER REASSEMBLY AND INSTALLATION .................... 16-10

MASTER CYLINDER ................................................................................. 16-12

FRONT MASTER CYLINDER REMOVAL AND DISASSEMBLY ...... 16-12

MASTER CYLINDER INSPECTION ................................................... 16-13

MASTER CYLINDER CLEANING ....................................................... 16-13

FRONT MASTER CYLINDER REASSEMBLY AND

INSTALLATION ................................................................................... 16-14

REAR MASTER CYLINDER REMOVAL AND DISASSEMBLY ........ 16-15

MASTER CYLINDER INSPECTION ................................................... 16-16

REAR MASTER CYLINDER REASSEMBLY AND

INSTALLATION ................................................................................... 16-16

BRAKE LEVER .......................................................................................... 16-17

REMOVAL ........................................................................................... 16-17

INSTALLATION ................................................................................... 16-17

BRAKE PEDAL ......................................................................................... 16-18

REMOVAL ........................................................................................... 16-18

INSTALLATION ................................................................................... 16-18

16

16-2 FRONT AND REAR BRAKES

CONSTRUCTION

10 N·m

(1.0 kgf-m, 7.0 lb-ft)

FWD

23 N·m

(2.3 kgf-m,

16.5 lb-ft)

23 N·m

(2.3 kgf-m,

16.5 lb-ft)

23 N·m

(2.3 kgf-m,

16.5 lb-ft)

10 N·m

(1.0 kgf-m, 7.0 lb-ft)

18 N·m

(1.8 kgf-m,

13.0 lb-ft)

29 N·m

(2.9 kgf-m, 21.0 lb-ft)

23 N·m

(2.3 kgf-m,

16.5 lb-ft)

25 N·m

(2.5 kgf-m, 18.0 lb-ft)

23 N·m

(2.3 kgf-m, 16.5 lb-ft)

6 N·m

(0.6 kgf-m, 4.5 lb-ft)

28 N·m

(2.8 kgf-m, 20.0 lb-ft)

18 N·m

(1.8 kgf-m, 13.0 lb-ft)

6 N·m

(0.6 kgf-m, 4.5 lb-ft)

13 N·m

(1.3 kgf-m, 9.5 lb-ft)

23 N·m

(2.3 kgf-m, 18.0 lb-ft)

18 N·m

(1.8 kgf-m, 13.0 lb-ft)

FWD

BRAKE FLUID AIR BLEEDING

WARNING

Brake fluid can be hazardous to humans and pets.

Brake fluid is harmful or fatal if swallowed, and harmful if it comes in contact with your skin or eyes.

Keep brake fluid away from children. Call your doctor immediately if brake fluid is swallowed and induce vomiting. Flush eyes or skin with water if brake fluid gets in eyes or comes in contact with skin.

WARNING

The use of any fluid except DOT 4 brake fluid from a sealed container can damage the brake system and lead to an accident.

Use only DOT 4 brake fluid from sealed container.

Never use or mix different types of brake fluid.

CAUTION

Spilled brake fluid can damage painted surfaces and plastic parts.

Be careful not to spill any brake fluid when servicing brake fluid. Wipe spilled fluid up immediately.

• Remove the reservoir cap.

• Connect a transparent tube to the bleeder valve and set the other end into a receptacle.

• Pour brake fluid up to the UPPER line.

Specification and classification: DOT 4

FRONT AND REAR BRAKES 16-3

16-4 FRONT AND REAR BRAKES

• Pump the brake lever/pedal until air bubbles stop coming out from the reservoir.

• Hold the brake lever/pedal in the squeezed position.

• Open the bleeder valve and tighten the bleeder valve.

• Release the brake lever/pedal.

• Repeat this sequence until air bubbles stop coming out from the bleeder valve.

NOTE:

* Do not release the brake lever/pedal while the bleeder valve is opened.

* Replenish brake fluid to the UPPER line when the brake fluid level drops below LOWER line.

• Tighten the air bleeder valve.

Air bleeder valve: 6 N·m (0.6 kgf-m, 4.5 lb-ft)

• Pour brake fluid up to the UPPER line.

• Reassemble the reservoir cap.

BRAKE FLUID REPLACEMENT

• Remove the reservoir cap. (

16-3)

• Suck up the brake fluid as much as possible.

• Drain the old brake fluid as much as possible.

• Fill the reservoir with new brake fluid.

• Connect a transparent tube to the bleeder valve and set the other end into a receptacle.

• Loosen the bleeder valve and pump the brake lever/pedal until old brake fluid is completely out of the brake system.

• Bleed air from the brake system. (

16-3)

BRAKE PADS REPLACEMENT

FRONT BRAKE PADS

• Remove the cap 1 and pad mounting pin 2 .

• Remove the brake pads 3 .

NOTE:

Replace the two brake pads as a set.

• Fit the new brake pads into the caliper.

• Tighten the pad mounting pin to the specified torque.

Brake pad mounting pin: 18 N·m (1.8 kgf-m, 13.0 lb-ft)

NOTE:

Pump the brake lever several times to seat the brake pads after reassembling.

REAR BRAKE PADS

• Remove the cap

and pad mounting pin

• Remove the brake pads 3 .

NOTE:

Replace the two pads as a set.

• Fit the new brake pads into the caliper.

• Tighten the brake pad mounting pin to the specified torque.

Brake pad mounting pin: 18 N·m (1.8 kgf-m, 13.0 lb-ft)

NOTE:

Pump the brake pedal several times to seat the brake pads after reassembling.

FRONT AND REAR BRAKES 16-5

16-6 FRONT AND REAR BRAKES

BRAKE DISC INSPECTION

• Inspect the brake disc for damage.

• Measure the front and rear brake disc thickness.

Brake disc thickness

Service limit (Front): 2.5 mm (0.10 in)

(Rear): 3.5 mm (0.14 in)

• Measure the front and rear brake disc runout.

Brake disc runout

Service limit: 0.30 mm (0.012 in)

BRAKE DISC REPLACEMENT (

15-5, -10)

CALIPER

WARNING

The use of any brake fluid except DOT 4 brake fluid from a sealed container can damage the brake system and lead to an accident.

Use only DOT 4 brake fluid from a sealed container.

Never use or mix different types of brake fluid.

WARNING

Brake fluid can be hazardous to humans and pets.

Brake fluid is harmful or fatal if swallowed, and harmful if it comes in contact with your skin or eyes.

CAUTION

Spilled brake fluid can damage painted surfaces and plastic parts.

Be careful not to spill any fluid when servicing the caliper. Wipe spilled fluid up immediately.

FRONT CALIPER REMOVAL AND

DISASSEMBLY

• Place a rag under the brake hose union bolt to catch spilled brake fluid.

• Disconnect the brake hose.

• Remove the caliper mounting bolts 1 .

• Remove the caliper.

• Remove the brake pads. (

16-5)

• Remove the spring 2 .

FRONT AND REAR BRAKES 16-7

• Remove the caliper bracket 3 from the caliper.

• Remove the boots 4 and 5 .

• Remove the spring 6 .

• Wrap the caliper with a rag to prevent brake fluid scatter and piston pop-out.

• Apply low-pressure air into the caliper through the hole to remove the pistons.

WARNING

Fingers can get caught between piston and caliper body when removing the piston.

Do not place your fingers on the piston when removing the piston.

16-8 FRONT AND REAR BRAKES

• Remove the dust seals 7 and piston seals 8 .

CALIPER INSPECTION

• Inspect the caliper cylinder for scuffing, wear and damage.

• Inspect the piston for scuffing, wear and damage.

• Replace the defective parts with a new one.

CALIPER CLEANING

• Flush the caliper ports with pressurized air.

• Wash the caliper piston and cylinder with fresh brake fluid.

Specification and classification: DOT 4

NOTE:

Do not use gasoline or other cleaning solvents to wash the caliper parts.

FRONT CALIPER REASSEMBLY AND

INSTALLATION

Reassemble and install the brake caliper in the reverse order of removal and disassembly. Pay attention to the following points:

• Apply brake fluid to the new piston seals, new dust seals and pistons and fit the piston seals, dust seals and pistons.

Specification and classification: DOT 4

• Install the springs and boots.

• Apply SUZUKI SILICONE GREASE to the caliper axles.

99000-25100: SUZUKI SILICONE GREASE

• Install the caliper bracket.

• Install the brake pads.

• Temporarily tighten the brake pad mounting pin.

• Tighten the caliper mounting bolts 1 to the specified torque.

Brake caliper mounting bolt:

25 N·m (2.5 kgf-m, 18.0 lb-ft)

• Tighten the brake pad mounting pin 2 to the specified torque.

Brake pad mounting pin: 18 N·m (1.8 kgf-m, 13.0 lb-ft)

• Set the brake hose end between the hose stopper, then tighten the brake hose union bolt 3 to the specified torque.

CAUTION

The seal washers should be replaced with the new ones to prevent fluid leakage.

Brake hose union bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Install the pad mounting pin cap.

• Refill brake fluid and bleed air from the brake system.

(

16-3)

REAR CALIPER REMOVAL AND

DISASSEMBLY

• Remove the rear wheel. (

15-7)

• Remove the disc cover 1 and caliper protector 2 .

• Place a rag under the brake hose union bolt to catch spilled brake fluid.

• Disconnect the brake hose.

• Remove the caliper.

• Remove the brake pad. (

16-5)

• Remove the spring 3 .

FRONT AND REAR BRAKES 16-9

16-10 FRONT AND REAR BRAKES

• Remove the caliper bracket 4 from the caliper.

• Remove the boots 5 and 6 .

• Remove the spring 7 .

• Wrap the caliper with a rag to prevent brake fluid scatter and piston pop-out.

• Apply low-pressure air into the caliper through the hole to remove the piston.

WARNING

Fingers can get caught between piston and caliper body when removing the piston.

Do not place your fingers on the piston when removing the piston.

• Remove the dust seal 8 and piston seal 9 .

Brake caliper inspection and cleaning (

16-8)

REAR CALIPER REASSEMBLY AND

INSTALLATION

Reassemble and install the brake caliper in the reverse order of removal and disassembly. Pay attention to the following points:

• Apply brake fluid to the new piston seal, new dust seal and piston fit the piston seal, dust seal and piston.

Specification and classification: DOT 4

• Install the springs and boots.

• Apply SUZUKI SILICONE GREASE to the caliper axles.

99000-25100: SUZUKI SILICONE GREASE

• Install the caliper bracket.

• Install the brake pads.

• Temporarily tighten the brake pad mounting pin.

• Tighten the brake pad mounting pin 1 to the specified torque.

Brake pad mounting pin: 18 N·m (1.8 kgf-m, 13.0 lb-ft)

• Set the brake hose end between the hose stopper, then tighten the brake hose union bolt 2 to the specified torque.

CAUTION

The seal washers should be replaced with new ones to prevent fluid leakage.

Brake hose union bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Install the rear wheel. (

15-11)

• Refill brake fluid and bleed air from the brake system.

(

16-3)

FRONT AND REAR BRAKES 16-11

16-12 FRONT AND REAR BRAKES

MASTER CYLINDER

WARNING

Brake fluid can be hazardous to humans and pets.

Brake fluid is harmful or fatal if swallowed, and harmful if it comes in contact with your skin or eyes.

WARNING

The use of any fluid except DOT 4 brake fluid from a sealed container can damage the brake system and lead to an accident.

Use only DOT 4 brake fluid from a sealed container.

Never use or mix different types of brake fluid.

CAUTION

Spilled brake fluid can damage painted surfaces and plastic parts.

Be careful not to spill any fluid when filling the brake fluid reservoir. Wipe spilled fluid up immediately.

FRONT MASTER CYLINDER REMOVAL AND

DISASSEMBLY

• Drain brake fluid. (

16-4)

• Place a rag under the brake hose union bolt

to catch spilled brake fluid.

• Remove the union bolt

• Disconnect the brake hose.

• Remove the master cylinder 2 by removing the master cylinder holder bolts.

NOTE:

Mark the paint mark to the matching surface of master cylinder holder and handlebars.

• Remove the boot 3 .

• Remove the brake lever

• Remove the dust boot 5 and snap ring 6 .

09900-06108: Snap ring pliers

• Remove the washer 7 and piston/cup set 8 .

MASTER CYLINDER INSPECTION

• Inspect the cylinder bore and piston for scuffing, wear and damage.

• Inspect the piston rod and spring for damage.

• Replace the defective parts with a new one.

MASTER CYLINDER CLEANING

• Flush the master cylinder ports with pressurized air.

• Wash the master cylinder bore and piston with fresh brake fluid.

Specification and classification: DOT 4

NOTE:

Do not use gasoline or other cleaning solvents to wash the master cylinder parts.

FRONT AND REAR BRAKES 16-13

16-14 FRONT AND REAR BRAKES

FRONT MASTER CYLINDER REASSEMBLY

AND INSTALLATION

Reassemble and install the master cylinder in the reverse order of removal and disassembly. Pay attention to the following points:

• Install the brake lever. (

16-17)

NOTE:

When remounting the master cylinder onto the handlebar, align the master cylinder holder’s mating surface A with the matching mark

on the handlebar and tighten the upper bolt first.

• Tighten the master cylinder holder bolts 1 to the specified torque.

Master cylinder holder bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

Handlebars

• Set the brake hose end between the hose stopper, then tighten the brake hose union bolt 2 to the specified torque.

CAUTION

The seal washers should be replaced with new ones to prevent fluid leakage.

Brake hose union bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Refill brake fluid and bleed air from the brake system.

(

16-3)

Master cylinder holder

Clearance

Master cylinder

REAR MASTER CYLINDER REMOVAL AND

DISASSEMBLY

• Drain brake fluid. (

16-4)

• Remove the cotter pin and then master cylinder rod pin 1 and washer.

• Remove the master cylinder 2 by removing the bolts.

• Place a rag under the brake hose union bolt 3 to catch spilled brake fluid.

• Remove the union bolt 3 .

• Disconnect the brake hose.

• Remove the master cylinder.

• Remove the dust boot 4 and snap ring 5 .

09900-06108: Snap ring pliers

FRONT AND REAR BRAKES 16-15

• Remove the push rod 6 .

• Remove the piston/cup set 7 .

16-16 FRONT AND REAR BRAKES

MASTER CYLINDER INSPECTION

• Inspect the cylinder bore and piston for scuffing, wear and damage.

• Inspect the piston rod and spring for damage.

Master cylinder cleaning (

16-13)

REAR MASTER CYLINDER REASSEMBLY

AND INSTALLATION

Reassemble and install the master cylinder in the reverse order of removal and disassembly. Pay attention to the following points:

• Apply grease to the contact point between piston and push rod.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Set the brake hose end between the hose stoppers, then tighten the brake hose union bolt 1 to the specified torque.

CAUTION

The seal washers should be replaced with new ones to prevent fluid leakage.

Brake hose union bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

• Tighten the master cylinder mounting bolts 2 to the specified torque.

CAUTION

Improper brake hose routing can damage the brake hose.

Ensure the brake hose has enough clearance to the rear suspension spring.

Master cylinder mounting bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

• Install the master cylinder rod pin, washer and new cotter pin.

• Refill brake fluid and bleed air from the brake system.

(

16-3)

BRAKE LEVER

REMOVAL

• Remove the boot 1 and brake lever 2 .

• Remove the brake lever adjuster return spring 3 .

09930-11950: Torx wrench (T25)

INSTALLATION

Install the brake lever in the reverse order of removal. Pay attention to the following points:

• Apply grease to the brake lever adjuster return spring, pivot bolt and contact point between piston and brake lever.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Tighten the brake lever pivot bolt and lock-nut to the specified torque.

Brake lever pivot bolt 1 : 6 N·m (0.6 kgf-m, 4.5 lb-ft)

Brake lever pivot bolt lock-nut 2 :

6 N·m (0.6 kgf-m, 4.5 lb-ft)

FRONT AND REAR BRAKES 16-17

16-18 FRONT AND REAR BRAKES

BRAKE PEDAL

REMOVAL

• Remove the clip 1 .

• Remove the cotter pin 2 and washer 3 .

• Remove the master cylinder rod pin 4 .

• Remove the brake pedal pivot bolt 5 and return spring 6 .

INSTALLATION

• Apply SUZUKI SUPER GREASE to the oil seals and brake pedal pivot bolt.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Install the return spring 1 properly. (

19-28)

• Tighten the brake pedal pivot bolt 2 to the specified torque.

Brake pedal pivot bolt: 29 N·m (2.9 kgf-m, 21.0 lb-ft)

• Install the clip.

• Install the master cylinder rod pin 3 , washer and new cotter pin.

• Adjust the brake pedal height. (

2-32)

FRONT FORK AND STEERING 17-1

FRONT FORK AND STEERING

CONSTRUCTION ...................................................................................... 17- 2

FRONT FORK, STEERING ................................................................. 17- 2

HANDLEBAR CONTROLS ................................................................. 17- 3

REMOVAL ........................................................................................... 17- 4

DISASSEMBLY ................................................................................... 17- 5

INSPECTION ....................................................................................... 17- 9

REASSEMBLY .................................................................................... 17-11

INSTALLATION ................................................................................... 17-17

STEERING ................................................................................................. 17-18

REMOVAL ........................................................................................... 17-18

INSPECTION ....................................................................................... 17-20

BEARING REPLACEMENT ................................................................ 17-21

INSTALLATION ................................................................................... 17-22

17

17-2 FRONT FORK AND STEERING

CONSTRUCTION

FRONT FORK, STEERING

44 N.m

(4.4 kgf-m, 32.0 lb-ft)

25 N.m

(2.5 kgf-m, 18.0 lb-ft)

100 N.m

(10.0 kgf-m, 72.5 lb-ft)

23 N.m

(2.3 kgf-m, 16.5 lb-ft)

45 N.m (4.5 kgf-m, 32.5 lb-ft) then turn back 1/2 – 1/4

35 N.m

(3.5 kgf-m, 25.5 lb-ft)

23 N.m

(2.3 kgf-m, 16.5 lb-ft)

30 N.m (3.0 kgf-m, 21.5 lb-ft)

18 N.m

(1.8 kgf-m,

13.0 lb-ft)

22 N.m

(2.2 kgf-m, 16.0 lb-ft)

70 N.m

(7.0 kgf-m, 51.0 lb-ft)

FRONT FORK AND STEERING 17-3

HANDLEBAR CONTROLS

25 N·m

(2.5 kgf-m, 18.0 lb-ft)

Apply handle grip bond.

6 N·m

(0.6 kgf-m, 4.5 lb-ft)

6 N·m

(0.6 kgf-m, 4.5 lb-ft)

17-4 FRONT FORK AND STEERING

REMOVAL

• Place the motorcycle on a block to lift front wheel off the ground.

• Remove the front wheel. (

15-3)

• Remove the front number plate

• Remove the protector 2 .

• Remove the handlebars.

NOTE:

Mark the paint mark A to the matching surface of handlebar holder and handlebars before removing.

• Remove the fork protector 3 by removing the mounting bolts.

• Remove the brake caliper 4 . (

16-7)

• Loosen the front fork upper clamp bolts 5 .

• Loosen the front fork cap bolts 1 – 2 turns to facilitate later disassembly.

09941-53630: Front fork top cap wrench

• Hold the fork body and loosen the fork lower clamp bolts 6 .

• Remove the front fork.

DISASSEMBLY

• Set rebound and compression damper settings to the minimum settings (softest) before disassembling. Record the setting before turning the adjuster.

• Thoroughly clean the fork before disassembly.

CAUTION

Scratches or other damage on the inner tube or on the oil seal lip will cause oil leakage.

Avoid scratching or damaging the inner tube or the oil seal. Use a mild detergent or car wash soap and sponge out dirt with plenty of water.

• Clamp the outer tube with a vise. Protect the outer tube with a rag when using a vise.

• Loosen and remove the fork cap bolt (sub-tank) from the outer tube and slowly slide down the outer tube.

09941-53630: Front fork top cap wrench

WARNING

Clamping the outer tube too tight can damage it which will affect riding stability.

Do not clamp the outer tube too tight.

• Place a drain pan under the front fork and drain fork oil.

NOTE:

Face the oil hole A on the sub-tank downward.

• Raise the outer tube and temporarily install the fork cap bolt

1 (sub-tank) to the outer tube.

FRONT FORK AND STEERING 17-5

17-6 FRONT FORK AND STEERING

• Clamp the axle holder 2 with a vise. Protect the axle holder with a rag when using a vise.

• Loosen the center bolt 3 completely with a 21 mm socket wrench.

WARNING

Clamping the axle holder too tight can damage it which will affect riding stability.

Do not clamp the axle holder too tight.

• Compress the outer tube by hands and install the conrod holder (special tool) between the axle holder bottom 2 and lock-nut 4 .

09910-20115: Conrod holder

• Hold the lock-nut with a wrench and remove the center bolt.

• Remove the push rod 5 .

• With the outer tube compressed by hands, remove the special tool.

CAUTION

Removing the lock-nut 4 and pushing the inner rod thread into the damper rod will damage the inner rod oil seal.

Do not remove the lock-nut 4 from the inner rod.

• Loosen the fork cap bolt

(sub-tank) and remove the subtank 6 along with the damper rod assembly 7 .

• Remove the fork spring 8 .

CAUTION

Do not attempt to disassemble the damper rod assembly.

The damper rod assembly is available only as an assembly.

FRONT FORK AND STEERING 17-7

• Remove the dust seal 9 .

• Remove the stopper ring 0 .

CAUTION

Scratches on the inner tube could cause oil leaks.

Avoid scratching when removing.

17-8 FRONT FORK AND STEERING

INNER TUBE

• Separate the inner tube 1 out of the outer tube 2 .

• Remove the slide bushing 3 from the inner tube 1 .

• Remove the following parts from the inner tube 1 .

Guide bushing 4

Seal retainer 5

Oil seal 6

Stopper ring 7

Dust seal 8

DANPER ROD AND COMPRESSION DAMPER UNIT

• Hold the bottom (flat part) of the sub-tank loose the compression damper unit 1 .

• Remove the compression damper unit 1 from the sub-tank

2 .

NOTE:

Slowly compress the inner rod

until it stops so that the compression damper unit can be removed easily.

• Drain the fork oil from the damper rod assembly by moving the inner rod several strokes.

FRONT FORK AND STEERING 17-9

INSPECTION

CENTER BOLT

• Inspect the adjuster rod of the center bolt for damage. If it is damaged, replace it with a new one.

COMPRESSION DAMPER UNIT

• Inspect the compression damper unit for damage. If it is damaged, replace it with a new one.

CAUTION

Disassembling the compression damper unit can lead to trouble.

Do not disassemble the compression damper unit.

INNER TUBE AND OUTER TUBE

• Inspect the inner tube for scratches. If it has scratches, replace it with a new one.

• Inspect the outer tube for dent. If it is dented all the way to the inner side, replace it with a new one.

• Measure the inner tube runout using the V-blocks and dial gauge.

Inner tube runout

Service Limit: 0.4 mm (0.02 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block (100 mm)

17-10 FRONT FORK AND STEERING

DAMPER ROD ASSEMBLY

• Inspect the damper rod assembly for scratches or bending. If it has scratches or is bent, replace it with a new one.

FORK SPRING

• Measure the free length of front fork spring.

• If it is shorter than service limit, replace it with a new one.

Service Limit: 487 mm (19.17 in)

SLIDE BUSHING AND GUIDE BUSHING

• Inspect the teflon coating metals (slide bushing and guide bushing) for wear or damage. If they are worn or damaged, replace them with new ones.

• Inspect the teflon coating metals surface. If they are not clean, clean them with a nylon brush and fork oil.

REASSEMBLY

CAUTION

Clean all fork parts before reassembling.

Replace the O-rings, oil seal and dust seal with new ones.

Apply specified front fork oil when installing the Orings, slide bushing, guide bushing, damper unit and sliding parts.

INNER TUBE

• Apply fork oil to the oil seal lip and the dust seal.

• Cover the inner tube with a plastic film.

• Install the following parts to the inner tube:

New dust seal 1

Stopper ring 2

New oil seal 3

CAUTION

Scratches on the oil seal lip can cause oil leaks.

When installing the seals, place a plastic film over the bushing attachment groove and edges of the inner tube to avoid damaging the seals’ lip.

NOTE:

The side of the oil seal that has a mark should face the dust seal.

• Remove the plastic film and then install the seal retainer 4 , guide bushing 5 and slide bushing 6 .

• Clean the parts and keep them free from dust.

NOTE:

Inspect the bushings for burrs. If there is a burr, remove it with a knife, taking care not to peel off the teflon coating. If the bushings have a large crack or excessive play after installing them, replace them with new ones.

• Insert the inner tube into the outer tube.

• Install the new oil seal

with the special tool until the stopper ring groove of the outer tube can be seen.

09940-52861: Front fork oil seal installer set

• Attach the stopper ring securely to the stopper ring groove of the outer tube.

FRONT FORK AND STEERING 17-11

17-12 FRONT FORK AND STEERING

• Attach the dust seal 4 .

NOTE:

After attaching the dust seal, make sure that there are no cracks around the circumference of the seal. Cracks could allow water, mud and the like to enter and cause an oil leak.

CAUTION

Use of grease as a substitute fork oil when installing the oil seal can result in an oil leak. Applying grease to the dust seal and oil seal can cause dirt to accumulate and damage the dust seal lip and oil seal lip.

Use only a thin coat of fork oil on the oil seal.

DAMPER ROD AND COMPRESSION DAMPER UNIT

• Clean each threaded part before installing.

• Replace the O-rings ( 1 , 2 , 3 ) with new ones.

• Apply fork oil to the O-rings and bushings on the compression damper unit.

• With the damper rod in fully extended position, pour the specified amount of fork oil.

Fork oil quantity (Inside the damper rod):

193 ml (6.52/6.80 US/lmp oz)

99000-99001-SS5: SUZUKI FORK OIL SS-05

(or equivalent fork oil)

• Replace the O-ring 4 with a new one.

• Apply fork oil to the O-ring.

• With the damper rod held immovable in fully extended position, gently install the compression damper unit 5 to the subtank

• Hold the bottom (flat part) of the sub-tank.

• Tighten the compression damper unit 5 to the specified torque.

Compression damper unit: 30 N·m (3.0 kgf-m, 21.5 lb-ft)

• With the damper rod held in vertical position, slowly move the inner rod several strokes.

FRONT FORK AND STEERING 17-13

100 mm

(3.9 in)

• Tighten the lock-nut by hand completely.

• With the damper rod held in vertical position, compress the damper rod fully to discharge an excess of oil.

CAUTION

Protect the inner rod end with a rag when compressing the damper rod.

NOTE:

Set the compression damper setting to the softest.

• Force out the remaining oil (discharged oil) using compressed air completely.

17-14 FRONT FORK AND STEERING

• With the damper rod in horizontal position, move the inner rod by hand to inspect it if operating smoothly.

• If the inner rod is not extend, repeat the “COMPRESSION

DAMPER UNIT” procedures (Pour the specified amount fork oil and discharge an excess of oil). (

17-12)

• Make sure approx. 10 mm (0.39 in) of inner rod thread is exposed on the end.

100 mm

(3.9 in)

Approx.10 mm

(0.39 in)

Lock-nut

• Completely wipe off the fork oil from the spring and damper rod assembly.

• Apply fork oil to the bushing 7 .

• Insert the spring and damper rod assembly into the fork.

• Temporarily tighten the fork cap bolt (sub-tank).

• Clamp the axle holder with a vise. Protect the axle holder with a rag when using a vise.

WARNING

Clamping the axle holder too tight can damage it which will affect riding stability.

Do not clamp the axle holder too tight.

• Compress the outer tube by hands and install the conrod holder (special tool) between the axle holder bottom and locknut.

09910-20115: Conrod holder

• Insert the push rod into the inner rod.

• Replace the O-ring with a new one.

• Apply fork oil to the O-ring.

• Insert the push rod

shaped projection C of center bolt into the

• Slowly tighten the center bolt until resistance is felt and check the clearance between the lock-nut and center bolt to provide

1 mm (0.04 in) and more.

FRONT FORK AND STEERING 17-15

1 mm (0.04 in) and more

• Turn the lock-nut counterclockwise until it contacts with the center bolt.

• With the lock-nut held immovable using a wrench, tighten the lock-nut/center bolt to the specified torque.

Lock-nut/center bolt: 22 N·m (2.2 kgf-m, 16.0 lb-ft)

• With the outer tube compressed by hands, remove the special tool.

17-16 FRONT FORK AND STEERING

• Tighten the center bolt to the specified torque.

Center bolt: 70 N·m (7.0 kgf-m, 50.5 lb-ft)

• Loosen and remove the fork cap bolt (sub-tank) from the outer tube and slowly slide down the outer tube.

09941-53630: Front fork top cap wrench

• Pour the specified amount of fork oil into the outer tube.

Oil quantity (When standard fork spring is used):

360 ml (12.17/12.68 US/lmp oz)

99000-99001-SS5: SUZUKI FORK OIL SS-05

(or equivalent fork oil)

• Raise the outer tube and temporarily tighten the fork cap bolt

(sub-tank).

09941-53630: Front fork top cap wrench

INSTALLATION

• Install the front fork with the line

aligned with the upper surface of the upper bracket.

• Check that the air valve

is positioned at the front.

• Tighten the fork lower clamp bolts to the specified torque.

Fork lower clamp bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

FRONT FORK AND STEERING 17-17

• Tighten the fork cap bolt (sub-tank) to the specified torque.

09941-53630 : Front fork top cap wrench

Fork cap bolt: 35 N·m (3.5 kgf-m, 25.5 lb-ft)

• Tighten the fork upper clamp bolts to the specified torque.

Fork upper clamp bolt: 23 N·m (2.3 kgf-m, 16.5 lb-ft)

NOTE:

Check that the air valve is positioned at the front.

• Install the handlebars. (

17-23)

• Install the front wheel. (

15-6)

• Install the brake caliper. (

16-9)

• Install the fork protector.

INSPECTION AFTER INSTALLATION

• Front fork (

2-33)

• Steering (

2-34)

• Wiring harness, cable and hose routing (

19-18 to -23)

17-18 FRONT FORK AND STEERING

STEERING

REMOVAL

HANDLEBARS

• Place the motorcycle on a block to lift front wheel off the ground.

• Remove the front number plate and protector. (

17-4)

• Remove the clamps.

• Remove the engine stop switch 1 .

• Remove the clutch lever holder.

NOTE:

Mark the paint marks to the matching surfaces of clutch lever holder and handlebars, left handle grip and handlebars.

• Remove the left handle grip 2 .

• Remove the front brake master cylinder.

NOTE:

Mark the paint mark to the matching surface of master cylinder holder and handlebars before removing.

• Remove the throttle case screws.

NOTE:

Mark the paint mark to the matching surface of throttle holder and handlebars before removing.

• Slightly loosen the handlebar holder set nuts.

• Remove the handlebar holder bolts and remove the handlebars.

NOTE:

Mark the paint mark to the matching surface of handlebar holder and handlebars before removing.

STEERING STEM

• Remove the front wheel 1 . (

15-3)

• Remove the brake hose guide.

• Remove the front forks 2 . (

17-4)

• Remove the front fender.

FRONT FORK AND STEERING 17-19

• Remove the steering stem head nut 3 and washer 4 .

• Remove the steering stem upper bracket.

• Remove the handlebar holder set bolts and nuts.

17-20 FRONT FORK AND STEERING

• Remove the handlebar holders, damper bushings and spacers.

• Remove the steering stem nut with the special tools.

NOTE:

Hold the steering stem lower bracket to prevent it from falling.

09940-14911: Steering nut socket wrench

09940-14960: Steering nut wrench socket

• Remove the steering stem lower bracket and lower bearing.

• Remove the upper bearing.

INSPECTION

• Inspect the removed parts for the following abnormalities.

• Distortion of the steering stem

• Bearing wear or damage

• Abnormal bearing noise

• Race wear or damage

• Damper bushing wear or damage

• If any abnormal points are found, replace defective parts with new ones.

BEARING REPLACEMENT

• Remove the lower bearing.

• Fit the lower bearing with the special tool.

09925-18011: Steering bearing installer

NOTE:

Replace the outer race and bearing as a set.

• Remove the upper outer race with the special tools.

09941-54911: Bearing outer race remover

09941-74911: Steering bearing installer

• Drive out the lower outer race using the steel rod.

• Fit the upper and lower outer races with the special tools.

09941-34513: Steering race installer

09924-84510: Bearing installer set (

51.5 Attachment)

FRONT FORK AND STEERING 17-21

17-22 FRONT FORK AND STEERING

INSTALLATION

Install the steering in the reverse order of steering removal.

Pay attention to the following points:

STEERING STEM

• Apply grease to the bearings.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Fit the steering stem lower bracket, upper bearing and steering stem nut.

• Tighten the steering stem nut with the special tools.

09940-14911: Steering nut socket wrench

09940-14960: Steering nut wrench socket

Steering stem nut: 45 N·m (4.5 kgf-m, 32.5 lb-ft)

• Move the steering stem right and left several times to seat the bearings.

• Turn back the steering stem nut by 1/4 – 1/2 turn.

• Install the damper bushings, spacers and handlebar holders.

NOTE:

Make sure that the notch make A on the handlebar holder faces backward.

• Temporarily tighten the handlebar holder set nuts.

• Install the steering stem upper bracket and washer.

• Temporarily install the steering stem head nut.

NOTE:

Pay attention to the direction of the washer.

1/4 – 1/2

FRONT FORK AND STEERING 17-23

• Temporarily install the front forks to the steering stem and tighten the lower clamp bolts.

• Tighten the steering stem head nut to the specified torque.

Steering stem head nut: 100 N·m (10.0 kgf-m, 72.5 lb-ft)

• Install the front fender as shown.

• Remount the front forks. (

17-17)

• Install the front wheel. (

15-6)

Washer

Bolt

Washer

• Insert the throttle assembly and spacer to the handlebars.

• Set the mark B on the handlebar holder forward.

• Align the matching mark C on the handlebars with the matching surface of the handlebar holder.

• Tighten the handlebar clamp bolts to the specified torque.

NOTE:

When tightening the handlebar clamp bolts, first tighten the bolts

1 .

Handlebar clamp bolt: 25 N·m (2.5 kgf-m, 18.0 lb-ft)

17-24 FRONT FORK AND STEERING

• Tighten the handlebar holder set nuts to the specified torque.

Handlebar holder set nut: 44 N·m (4.4 kgf-m, 32.0 lb-ft)

• Apply grease to the throttle cable and their hole.

(

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Align the matching mark D on the handlebars with the throttle holder matching surface.

• Tighten the screws securely.

• Align the matching mark E on the handlebars with the master cylinder matching surface.

• Tighten the upper bolt first temporarily to provide clearance on the lower side and then tighten both the bolts to the specified torque.

Master cylinder holder bolt: 10 N·m (1.0 kgf-m, 7.0 lb-ft)

HANDLEBARS

• Apply handle grip bond to the left handlebar end and inside of the left grip.

FRONT FORK AND STEERING 17-25

Apply handle grip bond.

• Align the “ ” mark on the left grip with the matching mark A on the left handlebar end.

Apply handle grip bond.

17-26 FRONT FORK AND STEERING

• Align the matching mark B on the handlebars with the clutch lever holder matching surface.

• Tighten the upper bolt first temporarily to provide clearance on the lower side and then tighten both the bolts.

• Install the engine stop switch and clamps.

• Install the front number plate and protector.

INSPECTION AFTER INSTALLATION

• Front fork (

2-33)

• Steering (

2-34)

• Wiring harness, cable and hose routing (

19-18 to -23)

REAR SUSPENSION 18-1

REAR SUSPENSION

CONSTRUCTION ...................................................................................... 18- 2

REAR SUSPENSION .......................................................................... 18- 2

REAR SHOCK ABSORBER ...................................................................... 18- 3

REMOVAL ........................................................................................... 18- 3

SPRING REPLACEMENT ................................................................... 18- 4

INSPECTION ....................................................................................... 18- 5

BEARING REPLACEMENT ................................................................ 18- 6

OIL REPLACEMENT ........................................................................... 18- 7

DISASSEMBLY AND INSPECTION ................................................... 18-10

REASSEMBLY .................................................................................... 18-11

INSTALLATION ................................................................................... 18-12

DISPOSAL ........................................................................................... 18-12

SWINGARM ............................................................................................... 18-13

REMOVAL ........................................................................................... 18-13

INSPECTION ....................................................................................... 18-15

BEARING REPLACEMENT ................................................................ 18-16

INSTALLATION ................................................................................... 18-17

REAR SUSPENSION LINKAGE ............................................................... 18-18

REMOVAL ........................................................................................... 18-18

INSPECTION ....................................................................................... 18-19

BEARING REPLACEMENT ................................................................ 18-20

INSTALLATION ................................................................................... 18-21

18

18-2 REAR SUSPENSION

CONSTRUCTION

REAR SUSPENSION

80 N.m (8.0 kgf-m, 58.0 lb-ft)

60 N.m (6.0 kgf-m, 43.5 lb-ft)

80 N.m

(8.0 kgf-m,

58.0 lb-ft)

80 N.m

(8.0 kgf-m,

58.0 lb-ft)

60 N.m

(6.0 kgf-m,

43.5 lb-ft)

70 N.m

(7.0 kgf-m, 50.5 lb-ft)

REAR SHOCK ABSORBER

REMOVAL

• Place a block under chassis tube.

• Remove the seat. (

5-2)

• Loosen the air cleaner clamp screw.

• Remove the right frame cover and muffler 1 . (

5-2, -3)

• Remove the seat rail assembly 2 .

REAR SUSPENSION 18-3

• Remove the rear shock absorber upper mounting bolt and nut.

18-4 REAR SUSPENSION

• Remove the rear shock absorber lower mounting bolt and nut.

NOTE:

If necessary, move the swingarm up or down to facilitate this mounting bolt/nut removal.

• Remove the rear shock absorber.

SPRING REPLACEMENT

• Loosen the lock-nut 1 with the special tool and turn it fully to the end of the thread.

• Turn the adjuster 2 as well as the lock-nut 1 .

09910-60611: Universal clamp wrench

• Depress the spring seat 3 and remove the stopper ring 4 .

• Remove the spring seat 3 and the spring 5 from the rear shock absorber.

• Install the lock-nut, adjuster, spring, spring seat and stopper ring.

NOTE:

* Install the spring as its painted side A or small diameter side faces bottom.

* When installing the spring seat, insert the tapered end B of the spring seat to the bottom.

• Adjust the spring set length and tighten the lock-nut.

Standard spring set length:

5.6 mm (0.22 in) compressed from the free length

Spring set length adjustable range:

247 – 263 mm (9.72 – 10.35 in)

[at spring free length 265 mm (10.43 in)] a : Hardest spring setting b : Softest spring setting

Spring adjuster lock-nut: 45 N·m (4.5 kgf-m, 32.5 lb-ft)

INSPECTION

• Inspect the rear shock absorber for oil leakage.

• Inspect the damper rod for bends and smooth movement.

• Inspect the bump rubber for deterioration and damage.

• Inspect the damper rod hidden by the bump rubber by moving the bump rubber.

• Replace the defective parts with a new one if necessary.

• Inspect the spacers and dust seals for damage.

• Inspect the bearing for excessive play and smooth movement.

• Replace the defective parts with a new one if necessary.

REAR SUSPENSION 18-5

18-6 REAR SUSPENSION

BEARING REPLACEMENT

• Remove the spacers.

• Remove the needle roller bearings 1 . (26 pieces of needle roller bearing)

• Remove the dust seals 2 .

• Remove the needle roller bearing cage 3 with the special tool.

09921-20240: Bearing remover set (Remover 17 mm)

• Press the new needle roller bearing cage with the special tool and a suitable size socket wrench.

NOTE:

When installing the needle roller bearing cage, the stamped mark on the bearing must face left side.

Position the needle roller bearing cage by referring to the illustration of page 18-22.

09924-84521: Bearing installer

• Press the new dust seals with the special tool and a suitable size socket wrench.

NOTE:

When installing the dust seal, the stamped mark A on the dust seal must face inside.

09924-84521: Bearing installer

• Apply grease to the needle roller bearings and install them.

• Apply grease to the dust seals and spacers.

• Install the spacers

and

B For right side

C For left side

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

OIL REPLACEMENT

TOOLS AND EQUIPMENT

• Following tools and equipment are required to perform oil replacement.

REAR SUSPENSION 18-7

1 Screwdriver or small punch

2 Vise*

3 Drain Pan

4 Oil can

5 Beaker

6 Specified Shock Oil (SS25)

* Not shown in the illustration

7 Rags

8 Nitrogen tank

9 Filler Hose and Nozzle

0 Regulator Assembly

A Owner’s Service Manual

OIL REPLACEMENT PROCEDURE

• Remove the rear shock absorber unit from the frame

(

18-3), clean and dry it.

• Remove the spring from the rear shock absorber unit.

(

18-4)

NOTE:

Inspect the rear shock absorber unit for oil leakage.

Turn the rebound damping force adjuster screw counterclockwise until it stops so that the rear suspension oil can be poured easily.

• Remove the valve cap. Press the valve with a screwdriver to bleed out nitrogen gas.

WARNING

Releasing high pressure gas from the rear shock absorber unit can be hazardous.

Never perform any servicing until the nitrogen gas pressure has been released from the rear shock absorber unit. When releasing the gas pressure, place a rag over the gas valve and use the tip of a screwdriver etc. to press the valve. Do not use your finger to depress the gas valve, and direct the valve away from your face and body.

18-8 REAR SUSPENSION

• Remove the compression adjuster assembly 1 from the rear shock absorber.

• Place a drain pan under the rear shock absorber unit.

• Move the rod and drain the oil completely.

• Push the valve core again to equalize the bladder to atmospheric pressure.

• Pour the fresh specified rear suspension oil as shown while moving the rod.

NOTE:

Be sure to extend the rod after filling the oil.

• Tilt the shock absorber unit as shown and pour the fresh rear suspension oil fully into the reservoir.

99000-99001-S25: SUZUKI REAR SUSPENSION OIL SS-25

(or equivalent rear suspension oil)

Oil capacity: 395 ml (13.35/13.91 US/Imp oz)

• Cover the compression adjuster hole with the root of your thumb.

• Tilt and shake the rear shock absorber unit to fill the reservoir with the oil.

• Add the oil and repeat the above procedure until the reservoir is filled with the oil completely.

• Replace the O-rings on the compression adjuster assembly with new ones.

• Reinstall the compression adjuster assembly 1 .

Compression adjuster assembly:

30 N·m (3.0 kgf-m, 21.5 lb-ft)

• Fill the rear shock absorber unit with nitrogen gas to 784 kPa

(8.0 kgf/cm 2 , 113.8 psi).

• Tighten the gas valve cap.

• Reinstall the spring. (

18-4)

WARNING

Use of flammable gas for pressuring the rear shock absorber unit can be hazardous. Flammable gas such as gas welding oxygen can cause a fire hazard.

Use nitrogen gas. If nitrogen gas is not available, compressed air free from water can be substituted.

WARNING

Applying too much pressure to the rear shock absorber unit may rupture the rear shock absorber unit.

Be sure to fill the rear shock absorber unit to the specified pressure.

CAUTION

Riding the motorcycle with abnormal gas pressure can damage the rear shock absorber unit. Low gas pressure can result in oil leakage. Abnormal gas pressure cannot provide normal rear shock absorber unit performance.

Be sure to fill the rear shock absorber unit to the specified pressure.

REAR SUSPENSION 18-9

18-10 REAR SUSPENSION

DISASSEMBLY AND INSPECTION

• Clean and dry the rear shock absorber.

• Remove the spring from the rear shock absorber. (

18-4)

• Turn the rebound damping force adjuster to the softest position.

• Press the valve with a screwdriver to bleed out nitrogen gas.

(

18-7)

• Remove the compression adjuster assembly and drain the oil.

(

18-8)

• Vise the rear shock absorber unit in inverted position.

• Depress the bump rubber fully to protect the damper rod.

• Evenly hammer the stopper

with a screwdriver or equivalent and remove it from the rear shock absorber body.

• Depress the seal case 2 with a screwdriver until the circlip 3 is fully exposed.

• Remove the circlip 4 .

NOTE:

Do not scratch the inner surface of the shock absorber body to avoid oil leaks.

• Extract the damper rod assembly from the shock absorber body.

• Inspect the oil seal and O-rings.

• Inspect the damper rod for bends and scratches.

• Inspect the inner surface of the body.

• Inspect the “teflon coating metal” on the piston.

• Replace the O-rings with new ones.

• Replace the “teflon coating metal” by cutting off the old one and putting a new one onto the piston if necessary.

REASSEMBLY

• Apply the rear suspension oil to the O-rings and the “teflon coating metal”.

• Insert the damper rod assembly 1 and fit a new circlip 2 .

• Pull up the damper rod assembly 1 until it is stopped by the circlip 2 .

• Fit the stopper to the shock absorber body.

• Fill the specified rear suspension oil in the rear shock absorber. (

18-8)

99000-99001-S25: SUZUKI REAR SUSPENSION OIL SS-25

(or equivalent rear suspension oil)

Oil capacity: 395 ml (13.35/13.91 US/Imp oz)

• Reinstall the compression adjuster assembly. (

18-9)

• Pressure the rear shock absorber unit with nitrogen gas to

784 kPa (8.0 kgf/cm 2 , 113.8 psi). (

18-9)

• Reassemble the spring and adjust the spring set length.

(

18-4)

• Tighten the valve cap.

REAR SUSPENSION 18-11

18-12 REAR SUSPENSION

INSTALLATION

Install the rear shock absorber in the reverse order of removal.

Pay attention to the following points:

• Tighten the rear shock absorber lower mounting bolt and nut to the specified torque.

NOTE:

If necessary, move the swingarm up or down to facilitate this mounting bolt/nut tightening.

Rear shock absorber lower mounting nut:

60 N·m (6.0 kgf-m, 43.5 lb-ft)

• Tighten the upper mounting bolt and nut to the specified torque.

Rear shock absorber upper mounting nut:

60 N·m (6.0 kgf-m, 43.5 lb-ft)

DISPOSAL

High pressure nitrogen gas is sealed in the rear shock absorber unit. Be sure to release gas before disposing the rear shock absorber unit.

• Remove the valve cap.

• Press the valve with a screwdriver.

WARNING

Releasing high pressure gas from the rear shock absorber unit can be hazardous.

Place a rag over the valve and push the valve with a screwdriver to release nitrogen gas. Do not use your finger to push the valve, and direct the valve away from your face and body.

SWINGARM

REMOVAL

• Place the motorcycle on a block to lift rear wheel off the ground.

• Remove the rear wheel. (

15-7)

• Remove the chain guide.

• Remove the rear brake hose guide.

• Remove the rear brake caliper from the swingarm.

• Remove the cushion rod bolt and nut.

• Remove the cushion lever bolt and nut.

• Remove the swingarm pivot nut and washer.

REAR SUSPENSION 18-13

18-14 REAR SUSPENSION

• Down the rear brake pedal, remove the pivot shaft.

• Remove the swingarm.

• Remove the chain buffer.

• Remove the plates.

• Remove the following parts from the swingarm.

Spacer 1

Oil seal 2

Washer 3

Thrust bearing 4

Dust seal 5

Spacer 6

INSPECTION

PIVOT SHAFT

• Measure the pivot shaft runout with the dial gauge and

V-blocks.

• If any the runout exceeds the limit, replace the pivot shaft with a new one.

Swingarm pivot shaft runout

Service Limit: 0.3 mm (0.01 in)

09900-20607: Dial gauge (1/100, 10 mm)

09900-20701: Magnetic stand

09900-21304: V-block set (100 mm)

CHAIN BUFFER AND CHAIN GUIDE

• Inspect the chain buffer and chain guide for damage and excessive wear.

• If any defects are found, replace the chain buffer or guide.

PLATE

• Inspect the plate for damage and excessive bend.

• If any defects are found, replace the plate with a new one.

SWINGARM

• Inspect the swingarm for cracks and damage.

• If any defects are found, replace the swingarm with a new one.

REAR SUSPENSION 18-15

18-16 REAR SUSPENSION

BEARING, SPACER, DUST SEAL, OIL SEAL

• Inspect the bearings, spacers, dust seals and oil seals for damage.

• Replace the defective parts with a new one.

• Insert the spacer into the bearings and inspect them for play and smooth movement.

• If excessive play is noted, replace the bearing with a new one.

BEARING REPLACEMENT

• Remove the bearings with the special tool.

09921-20240: Bearing remover set

• Press the new bearings with the special tool.

09924-84521: Bearing installer

• Apply grease to the bearings.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

INSTALLATION

Install the swingarm in the reverse order of removal. Pay attention to the following points:

• Install the following parts into the swingarm.

1 Oil seal 5 Washer

2 Spacer

3 Washer

4 Thrust bearing

Dust seal

Spacer

• Apply grease to the dust seals, bearings and oil seals.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

• Apply THREAD LOCK SUPER to the plate mounting screws.

99000-32110: THREAD LOCK SUPER “1322”

(or equivalent thread lock)

• Tighten the plate mounting screws securely.

• Install the chain buffer.

• Install the swingarm.

• Tighten the swingarm pivot nut to the specified torque.

Swingarm pivot nut: 70 N·m (7.0 kgf-m, 50.5 lb-ft)

• Install the cushion lever and cushion rod.

• Tighten the cushion lever nut and cushion rod nut to the specified torque.

Cushion lever nut: 80 N·m (8.0 kgf-m, 58.0 lb-ft)

Cushion rod nut: 80 N·m (8.0 kgf-m, 58.0 lb-ft)

• Install the rear wheel. (

15-11)

• Adjust the drive chain slack. (

2-28)

REAR SUSPENSION 18-17

18-18 REAR SUSPENSION

REAR SUSPENSION LINKAGE

REMOVAL

• Place a block under the chassis tubes.

• Remove the lower drive chain control roller 1 .

• Remove the rear cushion rod bolt and nut.

• Remove the cushion lever bolt and nut.

• Remove the shock absorber lower bolt and nut.

• Remove the collars, oil seals and spacers.

INSPECTION

• Inspect the cushion rod and cushion lever for damage.

• Inspect the dust seals, oil seals and spacers for damage.

• Replace the defective parts with a new one.

REAR SUSPENSION 18-19

• Insert the spacers into the bearings and inspect them for excessive play and smooth movement.

• If excessive play is noted, replace the bearing with a new one.

18-20 REAR SUSPENSION

BEARING REPLACEMENT

• Remove the collars, spacers and dust seals. (

18-18)

• Remove the needle roller bearings.

Cushion rod bearing

(One side 32 pieces of needle roller bearing)

Cushion lever bearing a (33 pieces of needle roller bearing) b (One side 32 pieces of needle roller bearing) c (One side 32 pieces of needle roller bearing)

• Remove the needle roller bearing cages with the special tool.

09921-20240: Bearing remover set (Remover 20 mm)

• Press fit the new needle roller bearing cages with the special tool and a suitable size socket wrench.

09924-84521: Bearing installer

NOTE:

* When installing the needle roller bearing cages 1 and 2 , the stamped mark on the bearing must face outside. ( 3 : right side)

* Position the needle roller bearing cages by referring to the illustration of page 18-22.

• Apply grease to the needle roller bearings and install them.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

INSTALLATION

Install the rear suspension linkage in the reverse order of removal. Pay attention to the following points:

• Position the dust seals 1 so that the manufacturer’s code indicated side of the seals face outside. ( 2 : inside)

• Apply grease to the dust seals.

99000-25010: SUZUKI SUPER GREASE “A”

(or equivalent grease)

REAR SUSPENSION 18-21

18-22 REAR SUSPENSION

• Tighten the cushion lever, cushion rod and swingarm nuts to the specified torque.

Left Right

4 mm (0.16 in)

4 mm

(0.16 in)

4 mm (0.16 in)

Tightening torque:

A : 60 N·m (6.0 kgf-m, 43.5 lb-ft)

B : 60 N·m (6.0 kgf-m, 43.5 lb-ft)

C : 80 N·m (8.0 kgf-m, 58.0 lb-ft)

D : 80 N·m (8.0 kgf-m, 58.0 lb-ft)

E : 80 N·m (8.0 kgf-m, 58.0 lb-ft)

F : 70 N·m (7.0 kgf-m, 50.5 lb-ft)

REAR SUSPENSION 18-23

Left Right

CAUTION

Improperly reassembled rear suspension linkage bolts can interfere with suspension movement and damage the rear suspension linkage.

* Make sure that the rear shock absorber rebound damping adjuster on the bottom bracket of the rear shock absorber is located to the right side.

* Insert the rear suspension linkage bolt 1 from the left side. Make sure that the nut B is in the recess of the rear shock absorber bottom bracket.

• Tighten the lower drive chain control roller nut to the specified torque.

Chain roller nut: 22 N·m (2.2 kgf-m, 16.0 lb-ft)

– MEMO –

SERVICING INFORMATION 19-1

SERVICING INFORMATION

SERVICE DATA ......................................................................................... 19- 2

TIGHTENING TORQUE ............................................................................. 19-10

SPECIAL TOOLS ...................................................................................... 19-14

WIRING DIAGRAM .................................................................................... 19-17

CABLE ROUTING ..................................................................................... 19-18

WIRING HARNESS ROUTING .................................................................. 19-20

FUEL HOSE ROUTING ............................................................................. 19-21

FUEL TANK CUSHION INSTALLATION .................................................. 19-22

RADIATOR HOSE ROUTING .................................................................... 19-23

WATER PUMP INSTALLATION ............................................................... 19-23

CRANKCASE AND COVER INSTALLATION ........................................... 19-24

MAGNETO INSTALLATION ...................................................................... 19-25

FRONT BRAKE HOSE ROUTING ............................................................ 19-26

REAR BRAKE HOSE ROUTING ............................................................... 19-27

REAR BRAKE PEDAL SET-UP ................................................................ 19-28

FRONT NUMBER PLATE INSTALLATION .............................................. 19-28

HANDLEBAR SET-UP .............................................................................. 19-29

CLUTCH CABLE ADJUSTER ................................................................... 19-30

REAR WHEEL SPOKES INSTALLATION ................................................ 19-30

EXHAUST PIPE AND MUFFLER INSTALLATION ................................... 19-31

RIM LOCK INSTALLATION ...................................................................... 19-31

FRONT FENDER INSTALLATION ........................................................... 19-32

REAR FENDER INSTALLATION ............................................................. 19-32

FRAME COVER INSTALLATION ............................................................. 19-33

FRAME COVER CUSHION INSTALLATION ............................................ 19-33

SPECIFICATIONS ..................................................................................... 19-34

SPARE PARTS LIST ................................................................................. 19-36

OPTIONAL PARTS .................................................................................... 19-36

SETTING DATA ......................................................................................... 19-37

19

19-2 SERVICING INFORMATION

SERVICE DATA

VALVE + GUIDE

ITEM

Valve diam.

Valve clearance (when cold)

Valve guide to valve stem clearance

Valve stem deflection

Valve guide I.D.

Valve stem O.D.

Valve stem runout

Valve seat width

Valve head radial runout

Valve spring free length

Valve spring tension

IN.

EX.

IN.

EX.

IN.

EX.

IN. & EX.

IN.

EX.

IN. & EX.

STANDARD

(1.22)

(0.98)

0.09 – 0.16

(0.004 – 0.006)

0.17 – 0.24

(0.006 – 0.009)

0.010 – 0.037

(0.0004 – 0.0015)

0.030 – 0.057

(0.0012 – 0.0022)

—

4.500 – 4.512

(0.1772 – 0.1776)

4.475 – 4.490

(0.1762 – 0.1768)

4.455 – 4.470

(0.1754 – 0.1760)

—

0.9 – 1.1

(0.035 – 0.043)

— IN. & EX.

IN. —

EX.

IN. & EX.

—

147 N (15 kgf, 33.1 lbs) at length 33.55 mm (1.321 in)

Unit: mm (in)

LIMIT

—

0.25

(0.010)

—

0.05

(0.002)

—

0.03

(0.001)

37.1

(1.46)

37.5

(1.48)

—

SERVICING INFORMATION 19-3

CAMSHAFT + CYLINDER HEAD

ITEM

Cam height

Camshaft journal oil clearance

Camshaft journal holder I.D.

Camshaft journal O.D.

Camshaft runout

Cam chain pin

Cylinder head distortion

Cylinder head cover distortion

IN.

EX.

IN. & EX.

STANDARD

34.86 – 34.91

(1.372 – 1.374)

34.38 – 34.43

(1.354 – 1.356)

0.023 – 0.066

(0.0013 – 0.0026)

22.003 – 22.025

(0.8663 – 0.8671)

21.959 – 21.980

(0.8645 – 0.8654)

—

13th pin

—

CYLINDER + PISTON + PISTON RING

ITEM

Compression pressure

(Automatic decomp. actuated)

Piston to cylinder clearance

STANDARD

400 – 800 kPa

(4.0 – 8.0 kgf/cm 2 , 57 – 114 psi)

0.030 – 0.040

(0.0012 – 0.0016)

Cylinder bore

Piston diam.

77.000 – 77.015

(3.0315 – 3.0321)

76.980 – 76.965

(3.0307 – 3.0301)

Measure at 8.5 mm (0.33 in) from the skirt end.

Cylinder distortion

—

Piston ring free end gap

Piston ring end gap

Piston ring to groove clearance

Piston ring groove width

Piston ring thickness

Piston pin bore

Piston pin O.D.

1st IR

1st

Oil

1st

Approx. 7.0 (0.28)

0.15 – 0.25

(0.006 – 0.010)

—

1.01 – 1.03

(0.0398 – 0.0406)

1.51 – 1.53

(0.0594 – 0.0602)

0.97 – 0.99

(0.0382 – 0.0390)

16.002 – 16.008

(0.6300 – 0.6302)

15.995 – 16.000

(0.6297 – 0.6299)

Unit: mm (in)

LIMIT

—

0.120

(0.0047)

Nicks or scratches

76.880

(3.0268)

0.05

(0.002)

5.6

(0.22)

0.50

(0.020)

0.180

(0.007)

—

16.030

(0.6311)

15.980

(0.6291)

Unit: mm (in)

LIMIT

34.56

(1.361)

34.08

(1.342)

0.150

(0.0059)

—

0.10

(0.004)

—

0.05

(0.002)

0.05

(0.002)

19-4 SERVICING INFORMATION

CONROD + CRANKSHAFT

ITEM

Conrod small end I.D.

Conrod deflection

Conrod big end side clearance

Conrod big end width

Crank web to web width

Crankshaft runout

STANDARD

16.010 – 16.018

(0.6303 – 0.6306)

—

0.20 – 0.65

(0.008 – 0.026)

17.75 – 17.80

(0.699 – 0.701)

55.9 – 56.1

(2.20 – 2.21)

—

OIL PUMP

ITEM

Oil pressure (at 50 °C, 122 °F)

STANDARD

20 kPa (0.2 kgf/cm 2 , 2.8 psi) at 6 000 r/min

CLUTCH

ITEM

Clutch lever play

Drive plate thickness

Drive plate claw width

Driven plate distortion

Clutch spring free length

STANDARD

10 – 15

(0.4 – 0.6)

2.72 – 2.88

(0.107 – 0.113)

13.85 – 13.96

(0.545 – 0.550)

—

45.22

(1.780)

RADIATOR + ENGINE COOLANT

ITEM

Radiator cap valve opening pressure

Engine coolant type

Engine coolant capacity

STANDARD/SPECIFICATION

95 – 125 kPa

(0.95 – 1.25 kgf/cm², 14 – 18 psi)

Use an anti-freeze/coolant compatible with aluminum radiator, mixed with distilled water only, at the ratio of 50:50.

950 ml

(1.0/0.8 US/lmp qt)

Unit: mm (in)

LIMIT

16.040

(0.6315)

3.0

(0.12)

1.0

(0.04)

—

0.08

(0.003)

LIMIT

—

Unit: mm (in)

LIMIT

—

2.42

(0.095)

13.05

(0.514)

0.10

(0.004)

43.0

(1.69)

LIMIT

—

SERVICING INFORMATION 19-5

TRANSMISSION + DRIVE CHAIN

ITEM

Primary reduction ratio

Final reduction ratio

Gear ratios Low

2nd

3rd

4th

Top

Shift fork to groove clearance

Shift fork groove width

Shift fork thickness

Drive chain

Drive chain slack

Gearshift lever height

STANDARD

3.210 (61/19)

4.000 (48/12)

2.153 (28/13)

1.764 (30/17)

1.470 (25/17)

1.238 (26/21)

No.1, 2 & 3

1.090 (24/22)

0.10 – 0.30

(0.004 – 0.012)

5.00 – 5.10

(0.197 – 0.201)

4.80 – 4.90

(0.189 – 0.193)

DID 520 DMA2

112 links

Type

Links

20-pitch length

—

35 – 45

(1.4 – 1.8)

5 – 10 (0.2 – 0.4)

(Above the top face of the foot rest)

Unit: mm (in) Except ratio

LIMIT

—

0.50

(0.020)

—

323.8

(12.75)

—

CARBURETOR

Carburetor type

Bore size

ITEM

I.D. No

Idle r/min

Float height

Fuel level

Main jet

Jet needle

Slow jet

Slow air jet

Starter jet

Pilot screw

Leak jet

Throttle stop screw

Throttle cable play

(pulling cable)

Hot starter cable play

(M.J.)

(J.N.)

(S.J.)

(S.A.J)

SPECIFICATION

E-03, 000

FCR37MX

37 mm

(1.46 in)

10H0

2 100 ± 50 r/min

8 mm

(0.31 in)

6.5 mm (0.26 in)

(Above the datum point)

#162

NLCT-3rd

#45

#100

#75

1 and 1/2 turns back

#40

Adjust to the specified idle speed.

2 – 4 mm

(0.08 – 0.16 in)

Approx. 3 mm (0.12 in)

E-19, 28

←

10H1

←

#170

NLCT-4th

←

19-6 SERVICING INFORMATION

ELECTRICAL

Ignition timing

Spark plug

ITEM

Spark performance

Pick-up coil resistance

Exciter coil resistance

Charge coil resistance

Pick-up coil peak voltage

Exciter coil peak voltage

Charge coil peak voltage

Ignition coil resistance

Ignition coil primary peak voltage

Engine stop switch resistance

Throttle position sensor input voltage

Throttle position sensor resistance

Type

Gap

Primary

SPECIFICATION

18° B.T.D.C. at 2 100 r/min.

NGK: CR8EIA-10

0.9 – 1.0 (0.035 – 0.039)

Over 8 (0.3) at 1 atm.

72 – 127

Ω

24 – 42

Ω

1.6 – 3.2

Ω

2 V and more

25 V and more

8 V and more

0.07 – 0.6

Ω

Secondary 4.8 – 7.1 k Ω

Closed

Opened

140 V and more

Under 1

Ω

4.5 – 5.5 V at 2 100 r/min

4 – 6 k Ω

0.6 – 1.0 k

Ω

3.2 – 5.0 k Ω

BRAKE + WHEEL

ITEM

Brake lever adjuster length

Rear brake pedal height

Brake disc thickness

Brake disc runout

Master cylinder bore

Master cylinder piston diam.

Rear

STANDARD

11 – 15

(0.4 – 0.6)

Front

0 – 10 (0 – 0.4)

(Below the top face of the foot rest)

3.0 ± 0.2

(0.118 ± 0.008)

4.0 ± 0.15

(0.157 ± 0.006)

Front &

Rear

—

Front

Rear

Front

Rear

11.000 – 11.043

(0.4331 – 0.4348)

11.000 – 11.043

(0.4331 – 0.4348)

10.957 – 10.984

(0.4314 – 0.4324)

10.957 – 10.984

(0.4314 – 0.4324)

Unit: mm (in)

NOTE

R – G

B/R – R/W

Y – B/W

+ R – G

B/R –

R/W

+ Y – B/W

Terminal –

Terminal

Plug cap –

+ terminal

Ground –

W/Bl

B/Y – B/W

+ B/G –

B/Br

Bl – B

Y – B

Unit: mm (in)

LIMIT

—

2.5

(0.10)

3.5

(0.14)

0.3

(0.012)

—

ITEM

Brake caliper cylinder bore

Brake caliper piston diam.

Brake fluid type

Wheel rim runout

Wheel rim size

Wheel axle runout

TIRE

ITEM

Cold inflation tire pressure

Tire size

Tire type

Tire tread depth

(Recommended depth)

SERVICING INFORMATION 19-7

Front

Rear

Front

Rear

Axial

Radial

Front

Rear

Front

Rear

STANDARD

27.000 – 27.050

(1.0630 – 1.0650)

25.400 – 25.450

(1.0000 – 1.0020)

26.900 – 26.950

(1.0591 – 1.0610)

25.335 – 25.368

(0.9974 – 0.9987)

DOT 4

—

1.60 × 21

1.85 × 19

—

Front &

Rear

Front

Rear

Front

Rear

Front &

Rear

STD/SPEC.

70 – 110 kPa

(0.7 – 1.1 kgf/cm 2 , 10 – 16 psi )

80/100-21 57M

100/90-19 57M

D742FA

D756

—

LIMIT

—

2.0

(0.08)

2.0

(0.08)

—

0.25

(0.010)

0.25

(0.010)

LIMIT

—

4.0 mm

(0.16 in)

19-8 SERVICING INFORMATION

SUSPENSION

ITEM

Front fork stroke

Front fork inner tube

O.D.

Front fork spring free length

Front fork damping force adjuster

Front fork air pressure

Front fork spring rate

Rebound

Compression

Rear shock absorber gas pressure

Rear shock absorber spring set length

Rear shock absorber spring rate

Rear shock absorber damping force adjuster

Rebound

Compression (High speed)

Compression (Low speed)

Rear wheel travel

Swingarm pivot shaft runout

STANDARD

310

(12.2)

(18.5)

494 ± 2.5

(19.45 ± 0.10)

MAX – 14 clicks turn back

MAX – 7 clicks turn back

0 kPa

(0 kgf/cm 2 , 0 psi)

4.4 N/mm

(0.44 kgf/mm)

784 kPa

(8.0 kgf/cm 2 , 133.8 psi)

5.6

(0.22)

54 N/mm

(5.4 kgf/mm)

MAX – 7 clicks turn back

MAX – 1 turn back

MAX – 8 clicks turn back

310

(12.2)

—

LIMIT

—

487 (19.17)

—

0.3

(0.01)

Unit: mm (in)

NOTE

5.6 mm (0.22 in) compressed from spring free length

SERVICING INFORMATION 19-9

FUEL + OIL

Fuel type

ITEM

Fuel tank capacity

Engine oil type

Engine oil capacity

Air cleaner element oil type

Front fork oil type

Front fork oil capacity

(each leg)

Rear shock absorber oil type

Rear shock absorber oil capacity

SPECIFICATION

Use only unleaded gasoline of at least 90 pump octane (R/2 + M/2 method).

Use only unleaded gasoline of at least 95 octane.

(Research method)

7.0 L

(1.8/1.5 US/Imp gal)

SAE 10W-40, API SF/SG or SH/SJ with JASO MA

MOTUL 300V 10W-40 (Recommendation oil) or

SAE 10W-40, API SF/SG or SH/SJ with JASO MA

Change

Filter change

900 ml

(1.0/0.8 US/Imp qt)

950 ml

(1.0/0.8 US/Imp qt)

Overhaul

1 000 ml

(1.1/0.9 US/Imp qt)

MOTUL AIR FILTER OIL or equivalent filter oil

SUZUKI FORK OIL SS-05 or an equivalent fork oil

360 ml

(12.17/12.68 US/Imp oz)

193 ml

(6.52/6.80 US/lmp oz)

SUZUKI REAR SUSPENSION OIL SS-25 or an equivalent suspension oil

395 ml

(13.35 /13.91 US/Imp oz)

NOTE

E-03, 28

The others

E-03

The others

Outer tube oil quantity

Damper rod oil quantity

19-10 SERVICING INFORMATION

TIGHTENING TORQUE

ENGINE

Cylinder head cover bolt

Spark plug

Cylinder head bolt

PART

Cylinder head base nut

Cylinder base bolt

Camshaft journal holder bolt

Primary drive gear nut

Magneto rotor nut

Clutch sleeve hub nut

Clutch spring set bolt

Gearshift arm stopper bolt

Gearshift cam driven pin

Shift cam stopper bolt

Kick starter stopper bolt

Cam chain tension adjuster mounting bolt

Cam chain tension adjuster cap bolt

Cam chain tensioner bolt

Cam chain guide retainer mounting bolt

Right crankcase cover bolt

Engine oil drain plug

Engine oil drain No.2 plug

Engine oil check bolt

Engine oil strainer cap

Oil filter cap bolt

Oil gallery plug

Oil pump mounting bolt

Crankcase bolt

Clutch cover bolt

Engine coolant drain bolt

Water pump case bolt

Impeller

TDC plug

Magneto cover bolt

Pick-up coil mounting bolt

Stator coil mounting bolt

Crankshaft hole plug

(Initial)

(Final)

4.5

N·m

8.0

3.25

4.5

8.0

4.5

8.0

10.0

8.0

3.25

7.0

8.0

7.0

8.0

15.0

4.5

15.0

7.0

65.0

58.0

65.0

7.0

16.5

17.5

7.0

lb-ft

10.0

8.0

18.0

36.0

7.0

8.5

7.0

16.5

7.0

1.1

0.45

0.6

1.1

0.6

1.1

1.4

1.1

0.45

1.0

1.1

1.0

1.1

2.1

0.6

2.1

1.0

2.3

2.4

1.0

9.0

8.0

9.0

kgf-m

1.4

1.1

2.5

5.0

1.0

1.2

1.0

2.3

1.0

PART

Engine mounting nut (upper)

Engine mounting nut (lower)

Engine mounting nut (front)

Engine mounting bracket nut (upper)

Engine mounting bracket nut (front)

Engine sprocket cover bolt

Kick starter lever bolt

Fuel valve mounting bolt

Exhaust pipe nut

Connector clamp bolt

Muffler mounting bolt (front & rear)

Exhaust pipe cover bolt

N·m

SERVICING INFORMATION 19-11

2.3

0.5

2.3

2.1

2.3

1.1

kgf-m

4.5

5.5

6.0

4.0

1.1

16.5

3.5

16.5

15.0

16.5

8.0

lb-ft

32.5

40.0

43.5

29.0

8.0

19-12 SERVICING INFORMATION

CHASSIS

PART

Handlebar clamp bolt

Handlebar holder set nut

Front fork upper clamp bolt (right and left)

Front fork lower clamp bolt (right and left)

Steering stem head nut

Front fork cap bolt

Lock-nut/center bolt

Front fork center bolt

Fork cylinder compression damper unit

Master cylinder holder bolt

Master cylinder mounting bolt

Master cylinder rod lock-nut

Brake lever pivot bolt

Brake lever pivot bolt lock-nut

Brake hose union bolt (front and rear)

Brake caliper mounting bolt (front)

Brake pad mounting pin (front and rear)

Brake caliper axle bolt (For bracket: rear)

Brake caliper axle bolt (For bracket and caliper: front)

Brake air bleeder valve (front and rear)

Disc plate bolt (front)

Disc plate bolt (rear)

Front axle nut

Front axle holder bolt

Rear axle nut

Rear sprocket nut

Chain roller bolt/nut

Spoke nipple

Rear swingarm pivot nut (engine mounting)

Rear shock absorber mounting nut (upper)

Rear shock absorber mounting nut (lower)

Rear cushion lever nut (upper and lower)

Rear cushion rod nut

Spring adjuster lock-nut

Seat rail bolt (upper and lower)

Footrest bolt

Cable adjuster lock-nut (throttle, clutch and hot starter)

100

2.2

N·m

100

25.5

13.0

72.5

21.5

16.0

4.5

50.5

43.5

16.5

18.0

13.0

20.0

16.5

4.5

8.5

18.0

43.5

58.0

32.5

17.5

25.5

1.60

16.0

50.5

21.5

7.0

4.5

lb-ft

18.0

32.0

16.5

72.5

25.5

3.5

1.8

10.0

3.0

2.2

0.6

7.0

6.0

2.3

0.6

1.2

2.5

2.3

2.5

1.8

2.8

6.0

8.0

4.5

2.4

3.5

0.22

1.0

0.6

2.2

7.0

3.0

1.0

kgf-m

2.5

4.4

2.3

10.0

3.5

SERVICING INFORMATION 19-13

For other bolts and nuts not listed in the table, refer to this chart.

Bolt Diameter

(mm)

Conventional or “4” marked bolt

N·m kgf-m lb-ft

1.5

0.15

0.3

1.0

2.0

5.5

0.55

1.3

2.9

4.5

4.0

9.5

21.0

32.5

105

160

6.5

10.5

16.0

47.0

76.0

115.5

“7” marked or crown headed bolt

N·m kgf-m lb-ft

2.3

4.5

0.23

0.45

1.5

3.0

1.0

2.3

5.0

8.5

7.0

16.5

36.0

61.5

135

210

240

13.5

21.0

24.0

97.5

152.0

173.5

Conventional bolt “4” marked bolt

“7” marked bolt

19-14 SERVICING INFORMATION

SPECIAL TOOLS

09900-06107

Snap ring pliers

09900-06108

Snap ring pliers

09900-20101

Vernier calipers

(150 mm)

09900-20202

Micrometer

(25 – 50 mm)

09900-20204

Micrometer

(75 – 100 mm)

09900-20205

Micrometer

(0 – 25 mm)

09900-20530

Cylinder gauge set

09900-20602

Dial gauge

(1/1 000, 1 mm)

09900-20607

Dial gauge

(1/100, 10 mm)

09900-20701

Magnetic stand

09900-20803

Thickness gauge

09900-20805

Tire depth gauge

09900-21304

V-block (100 mm)

09900-22301

Plastigauge

09900-22302

Plastigauge

09900-22401

Small bore gauge

(10 – 18 mm)

09900-22403

Small bore gauge

(18 – 35 mm)

09900-25008

Multi-circuit tester set

09900-25009

Needle pointed probe set

09910-20115

Conrod holder

09910-32812

Crankshaft installer

09910-60611

Universal clamp wrench

09911-11310

Crankshaft installer attachment

09913-10750

Compression gauge adaptor

09913-14541

Fuel level gauge set

SERVICING INFORMATION 19-15

09913-50121

Oil seal remover

09913-70210

Bearing installer set

09915-64512

Compression gauge

09915-74511

Oil pressure gauge

09916-10911

Valve lapper set

09916-14510

Valve lifter

09916-14521

Attachment

09916-14530

Attachment

09916-34542

Reamer handle

09916-33210

Valve guide reamer

(4.5 mm)

09916-33320

Valve guide reamer

(9.8 mm)

09916-43211

Valve guide installer/remover

09916-44920

Valve guide installer attachment

09916-84511

Tweezers

09919-28610

Sleeve protector

09920-13120

Crankcase separating tool

09920-53740

Clutch sleeve hub holder

09921-20200

Bearing remover

09921-20240

Bearing remover set

09923-74511

Bearing puller

09924-84510

Bearing installer set

09924-84521

Bearing installer

09925-18011

Steering bearing installer

09930-10121

Spark plug wrench set

09930-11950

Torx wrench (T25)

19-16 SERVICING INFORMATION

09930-30104

Slide shaft

09930-35020

Rotor remover

09930-44560

Rotor holder

09940-14911

Steering nut socket wrench

09940-14960

Steering nut wrench socket

09940-34581

Attachment (F)

09940-40211

Adapter

09940-52861

Front fork oil seal installer set

09941-34513

Steering race installer

09941-53630

Front fork top cap wrench

09941-54911

Bearing outer race remover

09941-74911

Bearing installer

WIRING DIAGRAM

CDI UNIT

SERVICING INFORMATION 19-17

IGNITION COIL

ENGINE

STOP

SWITCH

RUN

OFF

: Pickup

coil

MAGNETO

THROTTLE

POSITION

SENSOR

Ground

WIRE COLOR

B: Black

Bl: Blue

G: Green

R: Red

Y: Yellow

B/Bl: Black with Blue tracer

B/Br: Black with Brown tracer

B/G: Black with Green tracer

B/R: Black with Red tracer

B/W: Black with White tracer

B/Y: Black with Yellow tracer

R/W: Red with White tracer

W/Bl: White with Blue tracer

19-18 SERVICING INFORMATION

CABLE ROUTING

–

(2.4

– 3

.2 in

) m

–

SERVICING INFORMATION 19-19

. m

19-20 SERVICING INFORMATION

WIRING HARNESS ROUTING

FUEL HOSE ROUTING

SERVICING INFORMATION 19-21

: The ends of the clamp should face.....

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

Pass through the fuel hose above the hot starter cable and starter knob.

Forward.

19-22 SERVICING INFORMATION

FUEL TANK CUSHION INSTALLATION

130 mm (5.1 in)

250 mm (9.8 in)

Clean an adhesive surface before adhering the cushion.

0.3 mm (0.012 in)

SERVICING INFORMATION 19-23

RADIATOR HOSE ROUTING

: The clamp screw head should face.....

Hose clamp screw tightening torque:

2.3 N·m (0.23 kgf-m, 1.65 lb-ft)

Forward left side.

Face the white mark to the backward.

Face the blue mark to the backward.

Backward.

Face the blue mark to the backward.

Backward right side.

WATER PUMP INSTALLATION

Forward right side.

Face the white mark to the backward.

Backward right side.

Backward.

Face the white mark to the backward.

Right side.

Face the white mark to the upper.

Forward.

Face the blue mark to the right.

Forward right side.

6 N.m

(0.6 kgf-m, 4.5 lb-ft)

19-24 SERVICING INFORMATION

CRANKCASE AND COVER INSTALLATION

11 N.m (1.1 kgf-m, 8.0 lb-ft)

6 N.m

(0.6 kgf-m, 4.5 lb-ft)

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

6 N.m

(0.6 kgf-m, 4.5 lb-ft)

90˚

6 N.m (0.6 kgf-m, 4.5 lb-ft)

14 N.m (1.4 kgf-m, 10.0 lb-ft)

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

21 N.m

(2.1 kgf-m, 15.0 lb-ft)

11 N.m (1.1 kgf-m, 8.0 lb-ft)

MAGNETO INSTALLATION

SERVICING INFORMATION 19-25

80 N.m (8.0 kgf-m, 58.0 lb-ft)

4.5 N.m

(0.45 kgf-m, 3.25 lb-ft)

10 N.m

(1.0 kgf-m, 7.0 lb-ft)

Pass through the lead wire between stator mount boss and mount rib.

Do not pinch the lead wire between stator and magneto cover.

19-26 SERVICING INFORMATION

FRONT BRAKE HOSE ROUTING

Front brake hose

Front brake master cylinder

Stopper

Set the brake hose end between the hose stopper, then tighten the brake hose union bolt to the specified torque.

Front fork protector

Front brake hose

Hose guide

Front brake hose

Clamp

Clamp the upper difference portion in brake hose diameter.

Front brake hose

After touching the brake hose union to the stopper, tighten the union bolt to the specified torque.

Caliper

REAR BRAKE HOSE ROUTING

SERVICING INFORMATION 19-27

19-28 SERVICING INFORMATION

REAR BRAKE PEDAL SET-UP

SECT A A

FRONT NUMBER PLATE INSTALLATION

Number plate band

VIEW A

Number plate band

Handlebar

Hot starter cable

Clutch cable

0 – 10 mm

(0.0 – 0.4 in)

SERVICING INFORMATION 19-29

HANDLEBAR SET-UP

Throttle cable

(Pull side)

Upper side

Throttle cable

(Return side)

105˚

Upper side

Assemble throttle cables as to show this drawing.

Marking on drawing position.

Match slit of throttle case with marking.

Marking on drawing position.

Match “ ” mark of grip (L) with marking.

30˚

Apply adhesive to inner of grip and handlebars.

Upper side

66˚

10 – 12 mm

(0.39 – 0.47 in)

Marking on drawing position.

Match slit of master cylinder with marking.

Marking on drawing position.

Match slit of clutch lever with marking.

55˚

Approx. 3 mm (0.12 in)

Upper side

Put the boot of throttle cable on throttle case.

VIEW A

Make the cut-line of collor to lower side.

2.2 mm (0.087 in)

Position of velcro : backward

Marking on drawing position.

Match slit of handlebar holder with marking.

Marking (Left front side)

19-30 SERVICING INFORMATION

CLUTCH CABLE ADJUSTER

Quick adjuster

Turn to tighten the clutch cable tension.

When the movement is felt heavier, clean this and apply grease.

Turn to loosen the clutch cable tension.

Adjustable range

Adjuster

Do not apply grease to the rubber covers.

Fit the cover positively.

REAR WHEEL SPOKES INSTALLATION

1 Spoke (inner) L: 206.5 mm (8.13 in)

2 Spoke (outer) L: 204.5 mm (8.05 in)

EXHAUST PIPE AND MUFFLER INSTALLATION

SERVICING INFORMATION 19-31

23 N.m

(2.3 kgf-m, 16.5 lb-ft)

21 N.m

2.1 kgf-m,

15.0 lb-ft

23 N.m

(2.3 kgf-m, 16.5 lb-ft)

RIM LOCK INSTALLATION

ROTATIONAL DIRECTION

0 – 2 mm

(0.00 – 0.08 in)

11 N.m

(1.1 kgf-m, 8.0 lb-ft)

Rim lock for 1.85 RIM

40˚

19-32 SERVICING INFORMATION

FRONT FENDER INSTALLATION

REAR FENDER INSTALLATION

FRAME COVER INSTALLATION

SERVICING INFORMATION 19-33

FRAME COVER CUSHION INSTALLATION

Double-faced tape

19-34 SERVICING INFORMATION

SPECIFICATIONS

DIMENSIONS AND DRY MASS

Overall length ....................................................... 2 165 mm (85.2 in)

Overall width ........................................................ 830 mm (32.7 in)

Overall height ...................................................... 1 260 mm (49.6 in)

Wheelbase ........................................................... 1 465 mm (57.7 in)

Ground clearance ................................................ 350 mm (13.8 in)

Seat height........................................................... 955 mm (37.6 in)

Dry mass.............................................................. 92 kg (202 lbs)

ENGINE

Type ..................................................................... Four-stroke, liquid-cooled, DOHC

Number of cylinders ............................................. 1

Bore ..................................................................... 77.0 mm (3.03 in)

Stroke................................................................... 53.6 mm (2.11 in)

Displacement ....................................................... 249 cm 3 (15.2 cu. in)

Compression ratio ................................................ 13.4 : 1

Carburetor............................................................ KEIHIN FCR37MX

Air cleaner............................................................ Polyurethane foam element

Starter system...................................................... Primary kick

Lubrication system ............................................... Semi-dry sump

Idle speed ............................................................ 2 100 ± 50 r/min

TRANSMISSION

Clutch................................................................... Wet multi disc

Transmission ........................................................ 5-speed constant mesh

Gearshift pattern .................................................. 1-down, 4-up

Primary reduction ratio......................................... 3.210 (61/19)

Gear ratios, Low ................................................... 2.153 (28/13)

2nd.................................................... 1.764 (30/17)

3rd .................................................... 1.470 (25/17)

4th..................................................... 1.238 (26/21)

Top.................................................... 1.090 (24/22)

Final reduction ratio ............................................. 4.000 (48/12)

Drive chain ........................................................... D.I.D 520DMA2 112 links

SERVICING INFORMATION 19-35

CHASSIS

Front suspension .................................................

Upside-down telescopic fork

Rear suspension .................................................

Swingarm type

Front suspension stroke ......................................

310 mm (12.2 in)

Rear wheel travel ................................................

310 mm (12.2 in)

Caster..................................................................

27.17°

Trail......................................................................

115 mm (4.5 in)

Steering angle .....................................................

45° (right & left)

Front brake ..........................................................

Disc brake

Rear brake...........................................................

Disc brake

Front tire size.......................................................

80/100-21 51M, tube type

Rear tire size .......................................................

100/90-19 57M, tube type

ELECTRICAL

Ignition type .........................................................

Electronic Ignition (CDI)

Ignition timing ......................................................

18° B.T.D.C. at 2 100 r/min

Spark plug ...........................................................

NGK CR8EIA-10

CAPACITIES

Fuel tank, including reserve ................................

7.0 L (1.8 / 1.5 US/Imp gal)

Gear ratios, oil change ........................................

900 ml (1.0 / 0.8 US/Imp qt) with filter change ..............................

950 ml (1.0 / 0.8 US/Imp qt) overhaul ...........................................

1 000 ml (1.1 / 0.9 US/Imp qt)

Coolant ................................................................

950 ml (1.0 / 0.8 US/Imp qt)

19-36 SERVICING INFORMATION

SPARE PARTS LIST

ITEM

PART NAME

PARTS SET, SPARE

GASKET, MAGNETO COVER

GASKET, CLUTCH COVER OUTER

GASKET, EXHAUST, PIPE

CONNECTOR, MUF JT

FILTER COMP, ENGINE OIL

O-RING, WATER POMP CASE

LEVER, BRAKE

LEVER, CLUTCH

O-RING, SPROCKET SPACER

O-RING, OIL FILTER CAP

OPTIONAL PARTS

PARTS No.

NUMBER OF TEETH

PART NUMBER

19900-10H00

11483-10H00

11484-10H00

14181-10H00

14771-10H00

16510-35G00

17431-10H00

57310-37F00

57621-35G10

09280-20006

09280-39001

COMMENTS

Q’TY

MUFFLER SILENCER

ENGINE SPROCKET

14351-10H00

27511-14121

—

REAR SPROCKET

64511-29F00

64511-28E00

64511-36E00

64511-40261

—

114 L (13T – 48T)

112 L (12T – 47T)

112 L (13T – 47T)

114 L (12T – 49T)

114 L (13T – 49T)

114 L (12T – 50T)

114 L (13T – 50T)

114 L (12T – 51T)

114 L (13T – 51T)

FRONT BRAKE DISC

COVER

BEAD STOPPER

59231-36E30

65270-43D00

—

1.85

Carburetor:

4-2

Front fork spring:

4-14

Rear suspension spring:

4-19

SERVICING INFORMATION 19-37

SETTING DATA

DATE

RACE/COURSE

TEMP./HUMIDITY

WEATHER

COURSE COUDITION

MAIN JET

JET NEEDLE

SLOW JET

AIR SCREW

FLOAT LEVEL

SPARK PLUG

OIL LEVEL

COMP. ADJ. POSITION

RE-BOUND ADJ. POSITION

SPRING

SPRING SET LENGTH

SUG

COMP. ADJ. POSITION LOW

COMP. ADJ. POSITION HIGH

RE-BOUND ADJ. POSITION

FINAL REDUCTION RATIO

MAKER/SIZE

PRESSURE

MAKER/SIZE

PRESSURE

COMMENT:

/ /

/ mm mm mm kPa kPa

/ /

/ mm mm mm kPa kPa

/ /

/ mm mm mm kPa kPa

*MAKE COPIES.

– MEMO –

Failure to follow these safety precautions may increase your risk of injury:

Wear a helmet, eye protection, and bright protective clothing.

Don’t ride after consuming alcohol or other drugs.

This owner’s service manual contains important safety information. Please read it carefully.

300 TAKATSUKA, HAMAMATSU, JAPAN

Printed in Japan

Key features

249cc, 4-stroke, liquid-cooled engine for ample power and torque
Lightweight and agile chassis for easy handling and control
Advanced suspension system for smooth and responsive ride
High-quality components for durability and reliability
Perfect choice for experienced motocross riders

Frequently asked questions

The Suzuki RM-Z250 has a 249cc, 4-stroke, liquid-cooled engine.

Yes, the Suzuki RM-Z250 has a lightweight and agile chassis, making it easy to maneuver and control.

The Suzuki RM-Z250 is best suited for experienced motocross riders.

OWNER’S SERVICE MANUAL

FOREWORD

GENERAL CONSIDERATIONS

SERIAL NUMBER LOCATION

WARNINGS FOR SERVICING

PRECAUTIONS FOR

SERVICING

REPLACEMENT PARTS

SYMBOL MARKS AND MATERIALS

GENERAL INFORMATION

PERIODIC MAINTENANCE

TROUBLESHOOTING

MACHINE TUNING

ENGINE REMOVAL AND INSTALLATION

CYLINDER HEAD, CYLINDER AND PISTON

CLUTCH

KICK STARTER

GEARSHIFTING

TRANSMISSION AND CRANKSHAFT

LUBRICATION SYSTEM

FUEL SYSTEM

COOLING SYSTEM

ELECTRICAL SYSTEM

FRONT AND REAR WHEELS

FRONT AND REAR BRAKES

FRONT FORK AND STEERING

REAR SUSPENSION

SERVICING INFORMATION

GENERAL INFORMATION

1

CONTENTS

COUNTRY AND AREA CODES

LOCATION OF PARTS

ACCESSORY

SIDE STAND

FUEL AND OIL RECOMMENDATION

OPERATING INSTRUCTIONS

STARTING THE ENGINE

STOPPING THE ENGINE

TRANSMISSION

BREAK-IN (RUNNING-IN)

WHEN THE MOTORCYCLE IS NEW

WHEN ENGINE PARTS ARE REPLACED

EXTERIOR PARTS

– MEMO –

PERIODIC MAINTENANCE

CONTENTS

2

PERIODIC MAINTENANCE

CONTENTS

PERIODIC MAINTENANCE

INSPECTION BEFORE PRACTICE

INSPECTION BEFORE RACE

(All items of inspection before practice on previous page plus)

PERIODIC MAINTENANCE CHART

SPARK PLUG

AIR CLEANER

AIR CLEANER ELEMENT REMOVAL

WASHING

INSTALLATION

ENGINE OIL AND OIL FILTER

INSPECTION BEFORE ENGINE OIL LEVEL

CHECK

ENGINE OIL LEVEL INSPECTION

ENGINE OIL CHANGE

ENGINE OIL FILTER CHANGE

OIL STRAINERS

OIL STRAINER (Feed pump side) REMOVAL

OIL STRAINER (Scavenge pump side)

REMOVAL

INSPECTION

OIL STRAINER (Scavenge pump side)

INSTALLATION

OIL STRAINER (Feed pump side)

INSTALLATION

ENGINE COOLANT

ENGINE COOLANT LEVEL CHECK

ENGINE COOLANT REPLENISHMENT

COOLING SYSTEM INSPECTION

CLUTCH CABLE