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SERVICE MANUAL
Fiddle II 125 – AW12W
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SYM FORWARD
This service manual contains the technical data of each component inspection and repair for the SYM series motorcycle. The manual is shown with illustrations and focused on 「Service Procedures」, 「Operation Key
Points」, and 「Inspection Adjustment」 so that provides technician with service guidelines.
If the style and construction of the motorcycle are different from that of the photos, pictures shown in this manual, the actual vehicle shall prevail.
Specifications are subject to change without notice.
This manual that contains all data, illustration, indication and specifications is based on current production information. SYM reserves the right to make changes at any time without notice and without incurring any obligation whatever. No part of this manual can be duplicated by any means without written permission of SANYANG.
SERVICE DEPARTMENT
SAN YANG INDUSTRY CO., LTD.
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HOW TO USE THIS MANUAL SYM
This service manual describes basic information of different system parts and system inspection & service for SYM series motorcycles. In addition, please refer to the manual contents in detailed for the model you serviced in inspection and adjustment.
The first chapter covers general information and trouble diagnosis.
The second chapter covers service maintenance.
The third to the eleventh chapters cover engine and driving systems.
The twelfth to fifteenth chapters are contained the parts set of assembly body.
The sixteenth chapter is electrical equipment.
The seventh chapter is for wiring diagram.
Please see index of content for quick having the special parts and system information.
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SYM CONTENTS
CONTENTS
GENERAL INFORMATION/TROUBLE DIAGNOSIS ...................................1
MAINTENANCE INFORMATION .................................................................2
LUBRICATION SYSTEM..............................................................................3
FUEL SYSTEM .............................................................................................4
ENGINE REMOVAL......................................................................................5
CYLINDER HEAD/VALVE............................................................................6
CYLINDER/PISTON......................................................................................7
"V" TYPE BELT DRIVING SYSTEM/KICK STARTER ARM .......................8
FINAL DRIVING MECHANISM.....................................................................9
A.C. GENERATOR/STARTING CLUTCH ....................................................10
CRANKCASE/CRANKSHAFT .....................................................................11
BODY COVER ..............................................................................................12
BRAKE SYSTEM..........................................................................................13
STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER ........................14
REAR WHEEL/SUSPENSION......................................................................15
ELECTRICAL EQUIPMENT .........................................................................16
ELECTRICAL DIAGRAM .............................................................................17
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MECHANISM ILLUSTRATIONS SYM
Front turn signal light
Head light/
Position light
Engine control switch
Tail light
Meter
Rear brake lever
Horn/REG.REC
Front disk brake
Rear turn signal light
Exhaust muffler
Ignition coil
Oil level
Light/starter switch
Battery/Fuse/CDI
Frame number
High&Low beam/Seat open/turn signal/horn
Start magnetic switch
Fuel tank / Fuel unit
Tail light
Air cleaner
Gear oil filling bolt
Gear oil draining bolt
Engine number/engine oil draining bolt
A.C. Generator
RR. turning signal light
Winker relay
Front brake lever
Front turn signal light
Ignition switch
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SPECIAL TOOL
ITEM: R/L CRANKCASE DISASSEMBLE TOOL
NO:SYM-1120100
PURPOSE: DISASSEMBLE CRANKCASE
ITEM: CRANK PULLER
NO:SYM-1130000
PURPOSE: INSTALL CRANKCASE
ITEM: OUTER BEARING PULLER
NO:SYM-6204010
PURPOSE: REMOVE THE BEARING
ITEM: ACG FLYWHEEL PULLER
NO:SYM-3110A00
PURPOSE:
REMOVE ACG FLYWHEEL
ITEM: LOCK NUT PULLER
NO:SYM-9020100
PURPOSE:
REMOVE THE LOCK NUT
ITEM: UNIVERSAL HOLDER
NO:SYM-2210100
PURPOSE:HOLD THE MDF/CLUTCH OUTER
1
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ITEM: CLUTCHSPRING COMPRESSOR
NO:SYM-2301000
PURPOSE:DISASSEMBLE THE CLUTCH
SPECIAL TOOL
ITEM: CLUTCH NUT WRENCH
NO:SYM-9020200
PURPOSE:LOOSE THE CLUTCH NUT
ITEM: GY6 STARTER GEAR PULLER
NO:SYM-2822100-GY6
PURPOSE:REMOVE THE
STARTER GEAR
2
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYMBOLS AND MARKS ....................1-1
GENERAL SAFETY............................1-2
SERVICE PRECAUTIONS .................1-3
SPECIFICATIONS..............................1-9
TORQUE VALUES (ENGINE) .............. 1-10
TORQUE VALUES (FRAME) ............... 1-11
TROUBLES DIAGNOSIS ..................... 1-12
LUBRICATION POINTS ....................... 1-16
SYMBOLS AND MARKS
Symbols and marks are used in this manual to indicate what and where the special service are needed, in case supplemental information is procedures needed for these symbols and marks, explanations will be added to the text instead of using the symbols or marks.
Warning
Means that serious injury or even death may result if procedures are not followed.
Caution
Means that equipment damages may result if procedures are not followed.
Engine oil
Limits to use SAE 10W-30 API SH/CD class oil. Warranty will not cover the damage that caused by not apply with the limited engine oil.
Grease
King Mate G-3 is recommended.
Locking sealant
Apply sealant, medium strength sealant should be used unless otherwise specified.
Oil seal
Apply with lubricant.
Replace with a new part before installation.
Renew
Brake fluid Use recommended brake fluid DOT3 or WELLRUN brake fluid.
Special tools
Special service tools.
Correct
Meaning correct installation.
Wrong
Meaning wrong installation.
Indication Indication of components.
Directions
Indicates position and operation directions.
Components assembly directions each other.
Indicates where the bolt installation direction, --- means that bolt cross through the component (invisibility).
1-1
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
GENERAL SAFETY
Carbon monoxide
If you must run your engine, ensure the place is well ventilated. Never run your engine in a closed area. Run your engine in an open area, if you have to run your engine in a closed area, be sure to use an extractor.
Caution
Exhaust contains toxic gas which may cause one to lose consciousness and even result in death.
Gasoline
Gasoline is a low ignition point and explosive material. Work in a well-ventilated place, no flame or spark should be allowed in the work place or where gasoline is being stored.
Caution
Gasoline is highly flammable, and may explode under some conditions, keep it away from children.
Used engine oil
Caution
Prolonged contact with used engine oil (or transmission oil) may cause skin cancer although it might not be verdict.
Hot components
Caution
Components of the engine and exhaust system can become extremely hot after engine running.
They remain very hot even after the engine has been stopped for some time. When performing service work on these parts, wear insulated gloves and wait until cooling off.
Battery
Caution
Battery emits explosive gases; flame is strictly prohibited. Keep the place well ventilated when charging the battery.
Battery contains sulfuric acid (electrolyte) which can cause serious burns so be careful do not be spray on your eyes or skin. If you get battery acid on your skin, flush it off immediately with water. If you get battery acid in your eyes, flush it off immediately with water, then go to hospital to see an ophthalmologist.
If you swallow it by mistake, drink a lot of water or milk, and take some laxative such as castor oil or vegetable oil, and then go to see a doctor.
Keep electrolyte beyond reach of children.
Brake shoe
Do not use an compressed air or a dry brush to clean components of the brake system, use a vacuum cleaner or the equivalent to avoid asbestos dust flying.
Caution
Inhaling asbestos dust may cause disorders and cancer of the breathing system.
Brake fluid
Caution
Spilling brake fluid on painted, plastic, or rubber parts may cause damage to the parts. Place a clean towel on the above-mentioned parts for protection when servicing the brake system.
Keep brake fluid beyond reach of children.
1-2
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SERVICE PRECAUTIONS
Always use with SANYANG genuine parts and recommended oils. Using non-designed parts for SANYANG motorcycle may damage the motorcycle.
Special tools are designed for remove and install of components without damaging the parts being worked on. Using wrong tools may result in parts damaged.
When servicing this motorcycle, use only metric tools. Metric bolts, nuts, and screws are not interchangeable with the English system, using wrong tools and fasteners may damage this vehicle.
Clean the outside of the parts or the cover before removing it from the motorcycle.
Otherwise, dirt and deposit accumulated on the part's surface may fall into the engine, chassis, or brake system to cause a damage.
Wash and clean parts with high ignition point solvent, and blow dry with compressed air.
Pay special attention to O-rings or oil seals because most cleaning agents have an adverse effect on them.
Never bend or twist a control cable to prevent stiff control and premature worn out.
Rubber parts may become deteriorated when old, and prone to be damaged by solvent and oil. Check these parts before installation to make sure that they are in good condition, replace if necessary.
When loosening a component which has different sized fasteners, operate with a diagonal pattern and work from inside out.
Loosen the small fasteners first. If the bigger ones are loosen first, small fasteners may receive too much stress.
Store complex components such as transmission parts in the proper assemble order and tie them together with a wire for ease of installation later.
Note the reassemble position of the important components before disassembling them to ensure they will be reassembled in correct dimensions (depth, distance or position).
Components not to be reused should be replaced when disassembled including gaskets metal seal rings, O-rings, oil seals, snap rings, and split pins.
1-3
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
The length of bolts and screws for assemblies, cover plates or boxes is different from one another, be sure they are correctly installed. In case of confusion, Insert the bolt into the hole to compare its length with other bolts, if its length out side the hole is the same with other bolts, it is a correct bolt.
Bolts for the same assembly should have the same length.
Tighten assemblies with different dimension fasteners as follows:
Tighten all the fasteners with fingers, then tighten the big ones with special tool first diagonally from inside toward outside, important components should be tightened 2 to 3 times with appropriate increments to avoid warp unless otherwise indicated. Bolts and fasteners should be kept clean and dry.
Do not apply oil to the threads.
When oil seal is installed, fill the groove with grease, install the oil seal with the name of the manufacturer facing outside, check the shaft on which the oil seal is to be installed for smoothness and for burrs that may damage the oil seal.
Manufacturer's name
Remove residues of the old gasket or sealant before reinstallation, grind with a grindstone if the contact surface has any damage.
The ends of rubber hoses (for fuel, vacuum, or coolant) should be pushed as far as they can go to their connections so that there is enough room below the enlarged ends for tightening the clamps.
Groove
Clamp
Connector
Rubber and plastic boots should be properly reinstalled to the original correct positions as designed.
Boots
The tool should be pressed against two (inner and outer) bearing races when removing a ball bearing. Damage may result if the tool is pressed against only one race (either inner race or outer race). In this case, the bearing should be replaced. To avoid damaging the bearing, use equal force on both races.
Both of these examples can result in bearing damage.
1-4
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
Lubricate the rotation face with specified lubricant on the lubrication points before assembling.
Check if positions and operation for installed parts is in correct and properly.
Make sure service safety each other when conducting by two persons.
Note that do not let parts fall down
Before battery removal operation, it has to remove the battery negative (-) cable firstly.
Notre tools like open-end wrench do not contact with body to prevent from circuit short and create spark.
After service completed, make sure all connection points is secured. Battery positive (+) cable should be connected firstly.
And the two posts of battery have to be greased after connected the cables.
Make sure that the battery post caps are located in properly after the battery posts had been serviced.
If fuse burned, it has to find out the cause and solved it. And then replace with specified capacity fuse. capacity verification
1-5
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
When separating a connector, it locker has to be unlocked firstly. Then, conduct the service operation.
Do not pull the wires as removing a connector or wires. Hold the connector body.
Make sure if the connector pins are bent, extruded or loosen.
Insert the connector completely. If there are two lockers on two connector sides, make sure the lockers are locked in properly.
Check if any wire loose.
Check if the connector is covered by the twin connector boot completely and secured properly.
Before terminal connection, check if the boot is crack or the terminal is loose.
Insert the terminal completely. Check if the terminal is covered by the boot. Do not let boot open facing up.
Secure wires and wire harnesses to the frame with respective wire bands at the designated locations. Tighten the bands so that only the insulated surfaces contact the wires or wire harnesses.
Wire band and wire harness have to be clamped secured properly.
Do not squeeze wires against the weld or its clamp.
1-6
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
Do not let the wire harness contact with rotating, moving or vibrating components as routing the harness.
Keep wire harnesses far away from the hot parts.
Do not touch it.
Route wire harness to avoid sharp edges or corners and also avoid the projected ends of bolts and screws.
Route harnesses so that they neither pull too tight nor have excessive slack.
Do not extend it too much.
Protect wires or wire harnesses with electrical tape or tube if they contact a sharp edge or corner. Thoroughly clean the surface where tape is to be applied.
Secure the rubber boot firmly as applying it on wire harness.
Never use wires or harnesses which insulation has been broken. Wrap electrical tape around the damaged parts or replace them.
Never clamp or squeeze the wire harness as installing other components.
Please do not clip or squeeze the wire.
1-7
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
Do not let the wire harness been twisted as installation.
Wire harnesses routed along the handlebar should not be pulled too tight or have excessive slack, be rubbed against or interfere with adjacent or surrounding parts in all steering positions.
Before operating a test instrument, operator should read the operation manual of the instrument. And then, conduct test in accordance with the instruction.
Do you know how to set the instrument to its measurement position and the insert locations of its two probes?
With sand paper to clean rust on connector pins/terminals if found. And then conduct connection operation later.
Clean rust.
1-8
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SPECIFICATIONS
Overall Length
Overall Width
Overall Height
Wheel Base
1870mm
698 mm
1325 mm
1325mm
Front 41kg
Rear 68kg
Total 109kg
Passengers/
Weight
Two men/110 kg
Front 85kg
Front
Front
Front
Rear
Max. Speed
Climb Ability
TELESCOPIC FORK
110/70-12 47J
DISK (ø 190 mm)
DRUM (ø 130 mm)
>92km/h
>28°
Total 219kg
Type
Installation and arrangement
Fuel Required
Cycle/Cooling
Bore
Cylinder Number/Arran gement
Secondary
Reduction
GEAR
4-STROKE ENGINE
(OHC)
Vertical, below center, incline 80°
Unleaded gasoline
4-stroke/forced air cooled
Single Cylinder
Clutch
Lubrication System
Auto centrifugal clutch
Transmission C.V.T.
Speedometer 0 ~ 140 km/h
Horn 93~112dB
52.4 mm Muffler
Exhaust Pipe Position mm and Direction
Expansion & Pulse Type
Right side, and
Backward
Forced-circulation& splashing
Compression
Ratio
Max. HP
Max. Torque
9.6 : 1
6.25KW/8000 rpm
8.33N.m /6500 rpm
HC
Starting System Kick & electrical starter
Air Filtration
Engine Weight(dry weight)
<0.8 g/km
EURO3
Paper filter
< 77dB
30kg
1-9
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
TORQUE VALUES (ENGINE)
A.C. generator fixing bolts
Pulse generator hex bolts
Gear oil filling bolt
Oil pump flat bolts
Crankcase flange bolts
Oil pump drive sprocket nut
Cylinder/cylinder head two-ends bolts
Oil pump drive separator bolts
Cam holder nuts
Start clutch lock nut
Camshaft chain adjuster bolts
Cylinder head bolts
Cylinder head cover bolts
Right crankcase cover bolts
Flywheel nut
Shroud A/B tapping screws
Cooling fan bolts
Cooling fan cover
Transmission(Gear box) bolts
RR. brake arm bolt
Crankcase draining plug bolt
Drive pulley nut
Drive face nut
Start motor bolts
Left crankcase cover bolts
Carburetor nuts
A.I. fixing hex cap nuts
Valve adjustment fixing nuts
Gear oil draining plug bolt
Camshaft chain tensioner pivot
Spark plug
Engine oil strainer cap
Kick starter arm bolt
Exhaust pipe bolts
Exhaust pipe connecting nuts
4
2
2
1
1
1
1
2
10
2
1
1
1
2
2
2
7
1
1
1
3
4
2
3
4
10
2
4
1
2
2
1
2
2
1
THREAD DIA
(mm)
6
5
8
6
6
6
8
6
5
12
6
12
12
6
6
6
10
30
6
8
6
12
5
6
6
8
6
12
6
6
6
6
6
8
22
TORQUE
VALUE(Kg-m)
0.8~1.2
0.35~0.5
1.0~1.4
0.8~1.2
0.8~1.2
0.8~1.2
0.7~1.1
5.0~6.0
5.0~6.0
0.8~1.2
0.8~1.2
0.8~1.2
0.8~1.2
1.0~1.5
3.5~4.5
0.8~1.2
1.0~1.4
1.0~2.0
0.8~1.2
3.0~3.6
1.0~1.4
0.8~1.2
1.8~2.2
9.0~10.0
0.8~1.2
0.8~1.2
0.8~1.2
0.8~1.2
5.0~6.0
0.8~1.2
0.8~1.2
0.8~1.2
1.8~2.2
0.8~1.2
3.5~4.5
REMARKS
Tighten to crankcase
Apply oil to thread
Hex socket bolt
1-10
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
TORQUE VALUES (FRAME)
THREAD DIA
ITEM Q'TY
(mm)
Mounting bolt for steering handlebar
TORQUE
VALUE(Kg-m)
REMARKS
1 10 4.0~5.0
Mounting nut for steering rod 1 25.4 1.0~2.0
Cone seat for steering rod
Front wheel axle nut
Rear wheel axle nut
Wheel hub/rim mounting nuts
Speedometer cable locking screw
Front shock absorber mounting bolts
Rear shock absorber upper connection bolt
Rear shock absorber lower connection bolt
Brake lever bolts
Front brake hose bolts
Front brake air-bleeding valve
Front brake disc mounting bolts
Front brake clipper mounting bolts
Drum brake arm bolts
(front/rear)
Engine suspension bolts
Engine connection bolt
Main stand nut
1
1
1
25.4
12
16
0.2~0.3
5.0~7.0
11.0~13.0
8 8 2.8~3.2
1 5 0.15~0.3
4 8 2.4~3.0
1 10 3.5~4.5
1 8 2.4~3.0
2
2
6
10
0.8~1.2
3.3~3.7
1 6 0.8~1.0
4 10 4.0~4.5
2 10 3.1~3.5
2 6 0.8~1.2
2
1
1
10
10
10
4.5~5.5
4.5~5.5
3.5~4.5
On frame side
On engine side
Foot-starting lever bolt
Air cleaner bolts
1
2
6
6
1.6~1.8
1.0~1.4
The torque values listed in above table are for more important tighten torque values. Please see standard values for not listed in the table.
Standard Torque Values for Reference
TYPE
5mm bolt、nut
6mm bolt、nut
8mm bolt、nut
10mm bolt、nut
12mm bolt、nut
TIGHTEN TORQUE
0.45~0.60kgf-m
3.00~4.00kgf-m
5.00~6.00kgf-m
TYPE
3mm screw
6mm screw、SH nut
6mm bolt、nut
8mm bolt、nut
10mm bolt、nut
TIGHTEN TORQUE
0.05~0.08kgf-m
0.70~1.10kgf-m
1.00~1.40kgf-m
2.40~3.00kgf-m
3.50~4.50kgf-m
1-11
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
TROUBLES DIAGNOSIS
A. Engine hard to start or can not be started
Check and adjustment Fault condition
Loosen carburetor drain bolt to check if there is gasoline inside the carburetor
Fuel supplied tom carburetor sufficient
No fuel is supplied to carburetor
Remove spark plug, install it into spark plug cap, and perform a spark test against engine ground.
Check if sparks Weak sparks, no spark at all perform cylinder compression pressure test. cylinder compression pressure normal
Low compression pressure or no pressure
Re-start by following the starting procedures
No ignition
There are some signs of ignition, nut engine can not be started
Remove the spark plug again and check it.
Dry spark plug
Remove carburetor after 30 minutes and connect a hose onto fuel rich circuit. Then blow the hose with air
Wet spark plug
Probable causes
1. No fuel in fuel tank
2. Check if the pipes, fuel tank to carburetor and intake vacuum, are clogged.
3. Float valve clogged
4. Lines in fuel tank evaporation system clogged
5. Malfunction of fuel pump
6. Loosen or damaged fuel pump vacuum hose
7. Fuel filter clogged
1. Malfunction of spark plug
2. Spark plug foul
3. Malfunction of CDI set
4. Malfunction of AC generator
5. Ignition coil is in open or short circuit
6. Ignition coil leads open or short circuit
7. Malfunction of main switch
1. Piston ring seized
2. Malfunction of cylinder valves
3. Worn cylinder and piston ring
4. Cylinder gasket leak
5. Sand hole in compression parts
1. Malfunction of throttle valve operation
2. Air sucked into intake manifold
3. Incorrect ignition timing
1. Fuel level in carburetor too high
2. Malfunction of throttle valve operation
3. Throttle valve opening too wide
Blowing in normal
Blowing clogged 1. Malfunction of automatic by- starter
1-12
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
B. Engine run sluggish (Speed does not pick up, lack of power)
Check and adjustment Fault condition Probable causes
Try gradual acceleration and check engine speed
Engine speed can be increased.
Check ignition timing
(Using ignition lamp)
Engine speed can not be increased.
1. Air cleaner clogged
2. Poor fuel supply
3. Lines in fuel tank evaporation system clogged
4. Exhaust pipe clogged
5. Fuel level too low in carburetor
6. Fuel nozzle clogged in carburetor
Ignition timing correct
Incorrect ignition timing
1. Malfunction of CDI
2. Malfunction of AC alternator
Check cylinder compression pressure (using compression pressure gauge)
Compression pressure correct
Check if carburetor jet is clogged
No clogged
Remove spark plug
No foul or discoloration
Check if engine over heat
Normal
Continually drive in acceleration or high speed
No compression
Clogged
Fouled and discoloration
Engine overheat
1. Cylinder & piston ring worn out
2. Cylinder gasket leaked
3. Sand hole in compression parts
4. Valve deterioration
5. Seized piston ring
1. Remove foreign
1. Remove dirt
2. Incorrect spark plug heat range
1. Piston and cylinder worn out
2. Lean mixture
3. Poor fuel quality
4. Too much carbon deposited in combustion chamber
5. Ignition timing too advanced
6. Poor circuit on the cooling system
No knock
Knock
1. Too much carbon deposited in combustion chamber
2. Lean mixture
3. Poor fuel quality
4. Ignition timing too advanced
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1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
C. Engine runs sluggish (especially in low speed and idling)
Check and adjustment Fault condition
Check ignition timing
(using ignition lamp)
Normal Abnormal
Probable causes
1. Incorrect ignition timing (malfunction of CDI or AC alternator)
Adjust the air screw of carburetor
Good Poor
1. Rich mixture (loosen the screw)
2. Lean mixture (tighten the screw)
Air sucked through carburetor gasket
No air sucked Air sucked
1. Poor heat insulation gasket
2. Carburetor lock loose
3. Poor intake gasket
4. Poor carburetor O-ring
5. Vacuum hose crack
Remove spark plug, install spark plug into spark plug cap and perform spark test against engine ground
Good spark Poor
1. Spark plug fouled
2. Malfunction of CDI
3. Malfunction of AC generator
4. Malfunction of ignition coil
5. Open or short circuit in spark plug leads
6. Malfunction of main switch
D. Engine runs sluggish (High speed)
Check and adjustment Fault condition
Check ignition timing
Normal Abnormal
Check for fuel supplying system in automatic fuel cup
Good Poor
Probable causes
1. Malfunction of CDI
2. Malfunction of AC alternator
1. Insufficient fuel in fuel tank
2. Fuel filter clogged
3. Restricted fuel tank vent
Check if carburetor clogged
No clogged Clogged
1. Cleaning
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SYM
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
E. CLUTCH, DRIVING AND DRIVING PULLEY
FAULT CONDITIONS
Engine can be started but motorcycle can not be moved.
Engine running and misfire as motorcycle initial forward moving or jumping suddenly (rear wheel rotating as engine in running)
Poor initial driving ( Poor climbing performance)
PROBABLE CAUSES
1. Driving belt worn out or deformation
2. Driving disk damaged
3. Driving pulley spring broken
4. Clutch ling broken
5. Driving slide-shaft gear groove broken
6. Transmission gear damaged
1. Clutch ling spring broken
2. Clutch outer stick with clutch balance weights
3. Connection parts in clutch and shaft worn out or burned
1. Driving belt worn out or deformation
2. Balance weight roller worn out
3. Driving sliding gear shaft worn out
4. Driving disk spring deformation
5. Driving sliding gear shaft worn out
6. Greased in driving belt and sliding gear. http://www.motorcycle.in.th
1-15
1. GENERAL INFORMATION/TROUBLE DIAGNOSIS
SYM
LUBRICATION POINTS
Steering shaft bearing
Speedometer gear /
Front wheel bearing
Side stand shaft
Main stand shaft
Acceleration cable/ Front & rear brake lever pivot
Rear wheel bearing
1-16
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SYM 2. MAINTENANCE INFORMATION
PRECAUTIONS IN OPERATION .......2-1
PERIODICAL MAINTENANCE SCHEDULE
........2-2
LUBRICATION SYSTEM ....................2-3
FUEL SYSTEM...................................2-4
AIR CLEANER....................................2-5
THROTTLE VALVE OPERATION ......2-5
VALVE CLEARANCE INSPECTION & ADJUSTMENT
......2-6
CARBURETOR IDLING SPEED ADJUSTMENT
.2-7
IGNITION SYSTEM/SPARK PLUG ..2-8
CYLINDER COMPRESSION PRESSURE
.2-9
DRIVING SYSTEM............................. 2-9
STEERING SYSTEM ......................... 2-10
SUSPENSION SYSTEM .................... 2-10
FRONT DISK BRAKE SYSTEM ......... 2-11
DRUM BRAKE SYSTEM .................... 2-13
WHEEL/TIRE...................................... 2-14
BATTERY ........................................... 2-15
HEADLIGHT ADJUSTMENT .............. 2-15
NUTS、BOLTS TIGHTEN.................. 2-15
PRECAUTIONS IN OPERATION
Specification
Fuel Tank Capacity
Engine Oil
Transmission Gear oil
Clearance of throttle valve
Spark plug
“F” Mark in idling speed
Full timing advanced change
Idling speed
Cylinder compression pressure
Valve clearance: IN/EX
Tire dimension
Tire pressure (cold)
110 c.c.
2~6 mm
A7RC Gap: 0.6~0.7 mm
Before TDC 13º±3º /1800 rpm below
Before TDC 26º / 8000 rpm
1700±100 rpm
13 kg/cm²
0.12±0.02/ 0.12±0.02 mm front / rear single
110/70-12 47J / 120/70-12 51J
Front: 1.75 kg/cm² rear: 2.00 kg/cm²
Two persons Front: 1.75 kg/cm² rear: 2.25 kg/cm²
Battery capacity
Play of drum brake lever
12V 7Ah (MF battery)
10~20 mm
2-1
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2. MAINTENANCE INFORMATION SYM
PERIODICAL MAINTENANCE SCHEDULE
Mainte nance
Code
1
☆Air cleaner
2
☆2nd air jet leaner
3
☆Fuel filter
4
☆Oil filter
5
☆Engine oil change
6 Tire pressure
7 Battery inspection
8 Brake & free play check
9 Steering handle check
10 Cushion operation check
11 Every screw tightening check
12 Gear oil check for leaking
13
☆Spark plug check or change
14
☆Gear oil change
15 Frame lubrication
16 Exhaust pipe
17
☆Ignition timing
18
☆Emission check in Idling
19
☆Throttle operation
20
☆Engine bolt tightening
21
☆CVT driving device (belt﹞
22
☆CVT driving device (roller)
23 Lights/electrical equipment/mutli-meters
24 Main/side stands & springs
25 Fuel pipes
27 Cam chain
28
☆Valve clearance
29
☆Crankcase vapor control System
30
☆Crankcase blow-by over-flow pipe
31
☆2nd air jet system
32
☆vapor control system
1 Month
Item Initial
Every1000KM
3 month
Every3000KM
6 month
1 year
Every6000KM
Every12000K
M
I I R
C C C
R
Replacement for every 1000km
I I
I
I
I
I
I
I
I
I
I
I
I
I
I I R
R
Replacement for every 5000km
L
I I
I I
A I
I I
I I
C
I I
I I
I I
I I
I A
I C
I
Replacement for every 2000km
I I C
I
Code: I ~ Inspection, cleaning, and adjustment R ~ Replacement C ~ Cleaning (replaced if necessary) L ~ Lubrication
Have your motorcycle checked, adjusted, and recorded maintenance data periodically by your SYM Authorized Dealer to maintain the motorcycle at the optimum condition
The above maintenance schedule is established by taking the monthly 1000 kilometers as a reference which ever comes first.
Remarks:
1. These marks “☆” in the schedule are emission control items. According to EPA regulations, these items
must be perform normally periodical maintenance following the use r manual instructions. They are prohibited to be adjusted or repaired by unauthorized people. Otherwise, SYM is no responsible for the charge.
2. Clean or replace the air cleaner element more often when the motorcycle is operated on dusty roads or in the
Heavily- polluted environment.
3. Maintenance should be performed more often if the motorcycle is frequently operated in high speed and after the motorcycle has accumulated a higher mileage.
4. Preventive maintenance a. Ignition system - Perform maintenance and check when continuous abnormal ignition, misfire, after-burn, overheating occur. b. Carbon deposit removal - Remove carbon deposits in cylinder head, piston heads, exhaust system when power is obvious lower than ever. c. Replace worn out pistons, cylinder head.
2-2
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SYM 2. MAINTENANCE INFORMATION
LUBRICATION SYSTEM
Engine Oil Capacity
Caution
The vehicle must be parked on a level ground when checking oil capacity.
Run the engine for 2-3 minutes then stop, wait about 2-3 more minutes allowing engine oil to settle before checking the oil level.
Remove dipstick to check the oil level. If oil level is below the lower limit mark, add oil to the specified upper limit mark.
Oil change
Shut off the engine and remove dipstick.
Remove the oil drain plug on the bottom-left of crankcase to drain oil.
After draining out oil, clean oil plug and its
+-gasket and reinstall. Replace the gasket if it is damaged.
Torque value: 3.5~4.5 kgf-m
Caution
Warm up the engine. This will make the oil flow out easily.
Add oil to the specified capacity.
Oil Viscosity: SAE 10W-30, recommended using King-Mate serial oil.
Engine oil capacity:
Disassembly: 850cc
Change: 750cc
When checking for oil leak, run the engine at idle speed for a few minutes, then check oil capacity with dipstick.
Cleaning the oil strainer
Drain oil from engine, remove the strainer cover, spring and strainer.
If there is an accumulation on the screen, wash it off with suitable solvent
(recommended using compressed air).
Check O-ring for damage, replace if necessary.
Reinstall strainer, spring, O-ring and strainer cover.
Torque value: 1.0~2.0 kgf-m
Dipstick
Oil drain plug strainer cover oil strainer spring
2-3
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2. MAINTENANCE INFORMATION SYM
Gear Oil
Inspection
Check gear oil if leaking.
Park the motorcycle with main stand on flat level place.
Turn off engine and remove the gear oil draining plug.
Place a measurement cup under the draining hole.
Remove the oil drain plug and drain gear oil into a measurement cup.
Check gear oil if enough.
Replacement
At first, remove the gear oil refilling bolt, and then remove the draining plug.
Install the draining plug after drained oil out.
Torque value: 3.5~4.5 kgf-m
Caution
Inspect if washer is in good condition.
Replace it with new one if it was deformed or damaged.
Fill out gear oil to specified quantity from the engine oil filling hole.
Install the oil filling bolt.
Torque value: 1.0~1.4 kgf-m
Quantity: 100 c.c.
Recommended: King-Mate HYPOID GEAR
OIL ( #140 ).
Fuel System
Fuel Pipe
Remove luggage box, rear center cover, body cover, and rear fender, as well as front inner box.
Check all pipes, and replace it when they are deterioration, damage or leaking.
Warning
Gasoline is a low ignition material so any kind of fire is strictly prohibited as dealing it.
Fuel filter
Remove the fuel tank.
Remove fuel pipe from the fuel filter.
Replace the fuel filter with new one.
Install the fuel filter.
Caution
The arrow on the fuel filter means the flow direction of fuel and check it if leaking after installation.
Gear oil refilling bolt
Fuel filter
Gear oil draining plug
2-4
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SYM 2. MAINTENANCE INFORMATION
AIR CLEANER
Element
Remove 6 screws from the air cleaner cover.
Remove element of air cleaner (2 screws).
Check the element if dirt or damaged.
Replace it with new one if dirt or damaged.
Caution
Air cleaner element contains a paper made filter so do not try to clean it.
Make sure that the air cleaner cover had been installed properly after installation.
THROTTLE VALVE OPERATION
Have a wide open of throttle valve as handle bar in any position and release it to let back original (full closed) position.
Check handle bar if its operation is smooth.
Check throttle valve cable and replace it if deteriorated, twisted or damaged.
Lubricate the cable if operation is not smooth.
Measure handle bar free play in its flange part.
Free play:2~6 mm
Adjustment can be done in either ends.
Secondary adjustment is conducted from top side.
Remove rubber boot, loosen fixing nut, and then adjust it by turning the adjustment nut. screws×2
Rubber boot
Adjustment nut screws×6
Air cleaner element
2~6 mm
Fixing nut
2-5
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2. MAINTENANCE INFORMATION SYM
Primary adjustment is conducted from button side.
Loosen fixing nut, and adjust by turning the adjustment nut.
Tighten the fixing nut, and check acceleration operation condition.
Caution
When always riding in rainy area or full throttle position, maintenance period must be shorted. The deposits can be seen in the transparent section of draining hose.
VALVE CLEARANCE ADJUSTMENT
Adjustment nut
Fixing nut
Inspection hole
Caution
Checks and adjustment must be performed when engine is cold (below 35℃).
Remove luggage box and front center cover.
Remove the left body cover & left side cover.
Remove cylinder head cap.
Remove the ignition timing check hole on the cooling fan cover.
With “T” type wrench, turn crankshaft in clockwise motion so that mark (“T”) on the generator flywheel aligns with the mark on the crankshaft, and camshaft is at TDC position also as same as level of cylinder head top-end. A single hole on camshaft sprocket is forward to up. (Piston is at TDC position in the compression stroke.)
Caution
The crankshaft can not be rotated in counter-clockwise to prevent from damage so that valve clearance can not be measured.
TDC mark
Ignition timing mark
2-6
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SYM 2. MAINTENANCE INFORMATION
VALVE CLEARANCE INSPECTION
AND ADJUSTMENT
Check & adjust valve clearance with feeler gauge.
Valve clearance (IN/EX):
0.12±0.02/0.12±0.02 mm
Loosen fixing nut and turn the adjustment nut for adjustment.
Caution
It has to make sure that valve-rocker arm is be adjusted to standard level when adjusting it, and re-check the valve clearance after tightened the fixing nut.
CARBURETOR IDLE SPEED
ADJUSTMENT
Caution
Inspection & adjustment for idle speed have to be performed after all other parts in engine that needed adjustment have been adjusted.
Idle speed check and adjustment have to be done after engine is being warm up
(around 10 minutes).
Park the motorcycle with main stand and warn up engine.
Open the carburetor cover from the luggage box.
Turn the throttle valve stopper screw to specified idle speed.
Specified idle speed: 1700±100 rpm
Emission adjustment in Idle speed
Warm up the engine for around 10 minutes and then conduct this adjustment.
1. Connect the tachometer onto engine.
2. Adjust the idle speed adjustment screw and let engine runs in 1700±100 rpm.
3. Insert the exhaust sampling muffler of exhaust analyzer into the front section of exhaust pipe. Adjust the air adjustment screw so that emission value in idle speed is within standard.
4. Slightly accelerate the throttle valve and release it immediately. Repeat this for
2~3 times.
5. Read engine RPM and value on the exhaust analyzer. Repeat step 2 to step 4 procedures until measured value within standard.
EXHAUST EMISSION(EURO3):
CO<2.0g/km
HC<0.8g/km
NOX<0.15g/km
Feeler gauge
Fixing nut
Ignition coil cable
Throttle valve stopper screw
Air adjustment screw
2-7
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2. MAINTENANCE INFORMATION SYM
IGNITION SYSTEM
Ignition timing
Caution
C.D.I ignition system is set by manufacturer so it can not be adjusted.
Ignition timing check procedure is for checking whether C.D.I. function is in normal or not.
Remove ignition timing hole cap located on the cooling fan cap, or remove the cooling fan cap.
Check ignition timing with ignition light.
Start engine and set engine idle speed in
1700±100 rpm, and if the mark aligns with the “F”, then it means that ignition timing is correct.
Increase engine speed to 8000 rpm to check ignition timing advance. If the detent aligns with advance mark “
װ”, then it means ignition timing advance is in functional. If not, check CDI set, pulse flywheel, and pulse generator. Replace these components if malfunction of these parts are found.
SPARK PLUG
Appointed spark plug: A7RC
Remove luggage box.
Remove center cover.
Remove spark plug cap.
Clean dirt around the spark plug hole.
Remove spark plug.
Measure spark plug gap.
Spark plug gap: 0.6~0.7 mm
Carefully bend ground electrode of the plug to adjust the gap if necessary.
Screw the park plug into the plug hole with hands, then tighten the plug with a wrench to prevent from damaging the spark plug's thread.
Torque value: 1.0~1.2 kgf-m
Connect spark plug cap.
Ignition light
Spark plug
Side electrode
F mark
Center electrode
0.6~0.7mm
2-8
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SYM 2. MAINTENANCE INFORMATION
CYLINDER COPMRESSION PRESSURE
Warn up engine and then turnoff the engine.
Remove the luggage box and the center cover.
Remove spark plug cap and spark plug.
Install compression gauge.
Full open the throttle valve, and rotate the engine by means of stepping the kick-starting lever.
Caution
Rotate the engine until the reading in the gauge no more increasing.
Usually, the highest pressure reading will be obtained in 4~7 seconds.
Compression pressure: 13 Kg/cm²
Check following items if the pressure is too low:
Incorrect valve clearance
Valve leaking
Cylinder head leaking, piston, piston ring and cylinder worn out
If the pressure is too high, it means carbon deposits in combustion chamber or piston head.
Spark plug
Cylinder pressure gauge
Gear teeth
DRIVING SYSTEM
DRIVING BELT
Remove left side cover.
Remove mounting bolt located under air cleaner.
Remove 9 bolts of the engine left crankcase.
Remove the left crankcase cover.
Check if the belt is crack or worn out.
Replace the belt if necessary or in accord with the periodical maintenance schedule to replace it.
Width limit: above 18.5 mm
Clutch pad
Start the motorcycle and gradually increase throttle valve openness to check clutch pad operation.
If the motorcycle moves with shaking, then check its clutch pad for wearing. Replace it if necessary.
Clutch pad
Width
Clutch
2-9
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2. MAINTENANCE INFORMATION SYM
STEERING SYSTEM
Caution
Check all wires and cables if they are interfered with the rotation of steering handle bar.
Lift the front wheel out of ground.
Turn handle from right to left and check if turning is smoothly.
If handle turning is uneven and bending, or the handle can be operated in vertical direction, then adjust the handle top bearing.
SUSPENSION SYSTEM
Warning
Do not ride the motorcycle with poor shock absorber.
Looseness, wear or damage shock absorber will make poor stability and driveability.
Front shock absorber
Hold front brake lever and press down the front shock absorber for several times to check its operation.
Hold front brake lever and push forward the front shock absorber for several times to check its locking status.
Check if it is scratched or leaking.
Replace damaged and non-repairable components.
Tighten all nuts and bolts.
Rear Shock absorber
Press down the rear shock absorber for several times to check its operation.
Check if it is scratched or leaking.
Replace damaged and non-repairable components.
Park the motorcycle with main standard.
Start engine and let the rear wheel rotate after increased engine rpm. Check engine for any parts loose or shaking. Also check the engine suspension bushing for wear out.
Replace the bushing if worn out.
Tighten all nuts and bolts.
Rear Shock absorber
2-10
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SYM 2. MAINTENANCE INFORMATION
FRONT DISC BRAKE SYSTEM
BRAKE SYSTEM HOSE
Make sure the brake hoses for corrosion or leaking oil, and also check brake system for leaking.
BRAKE FLUID
Check brake fluid level in the brake fluid reservoir. If the level is lower than the
LOWER limit, add brake fluid to UPPER limit.
Also check brake system for leaking if low brake level found.
Caution
In order to maintain brake fluid in the reservoir in horizontal position, do not remove the cap until handle bar stop.
Do not operate the brake lever after the cap had been removed. Otherwise, the brake fluid will spread out if operated the lever.
Do not mix non-compatible brake fluid together.
FILLING OUT BRAKE FLUID
Tighten the drain valve, and add brake fluid.
Place the diaphragm in.
Operate the brake lever so that brake fluid contents inside the brake system hoses.
AIR BLEED OPERATION
Connect a transparent hose to draining valve.
Hold the brake lever and open air bleeding valve. Perform this operation alternative until there is no air inside the brake system hoses.
Caution
Before closing the air bleed valve, do not release the brake lever.
Brake fluid cap
Low brake level
Bubbles
Brake hose
Lower limit
Draining valve
Transparent hose
2-11
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2. MAINTENANCE INFORMATION SYM
Brake fluid cap
ADDED BRAKE FLUID
Add brake fluid to UPPER limit lever.
Recommended brake fluid: DOT3 or DOT4
WELL RUN brake fluid.
Caution
Never mix or use dirty brake fluid to prevent from damage brake system or reducing brake performance.
BRAKE LINING WEAR
The indent mark on brake lining is the wear limitation.
Replace the brake lining if the wear limit mark closed to the edge of brake disc.
Caution
It is not necessary to remove brake hose when replacing the brake lining.
Remove the brake clipper bolt, and take out the clipper.
Caution
Do not operate the brake lever after the clipper removed to avoid clipping the brake lining.
Pry out the brake lining with a flat driver if lining be clipped.
Remove brake lining bolt.
Take out the lining.
Caution
In order to maintain brake power balance, the brake lining must be replaced with one set.
Low limit
Brake clipper
Brake disc
Brake clipper bolt
Brake lining
Brake ling wear limit
Bolt
2-12
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SYM 2. MAINTENANCE INFORMATION
DRUM BRAKE SYSTEM
Front Brake Free Play: (Drum brake)
Measure free play of rear brake level at the end of the lever.
Free play: 10-20 mm
Adjust the free play by turning the front brake adjustment nut if necessary.
REAR BRAKE FREE PLAY: (DRUM
BRAKE TYPE)
Measure the free play of the front brake lever at the end of the lever.
Free play: 10-20 mm
Adjust the free play by turning the front brake adjustment nut if necessary.
BRAKE CONFIRAMTION
Caution
After brake adjustment, it has to check the brake operation to make sure the front and rear wheel can be braked.
Pull the brake lever, and make sure that the wear limit marks of brake ling on the both front & rear brake arm are closer and touch to the “
△”
marks. If so, replace the brake ling with new one.
10∼20mm
“△” mark
Increasing free play
Decreasing free play
Adjustment nut
Adjustment nut
Decreasing free play
Increasing free play
“△”marks
2-13
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2. MAINTENANCE INFORMATION SYM
BRAKE LIGHT SWITCH
The brake light switch is to lit up brake light as brake applied.
Make sure that electrical starter can be operated only under brake applying.
WHEEL/TIRE
Check if both front and rear tire pressure are within specification.
Caution
Tire pressure check should be done as cold tire.
Appointed tire pressure
Tire size
Tire pressure as cold tire
(Kg/cm²)
Load for single
Load for two persons
Appointed Tire
Front tire Rear tire
1.75 2.00
1.75
2.25
Front/Rear wheel:
120/70-12 47J/ 130/70-12 51J
Check if tire surface is ticked with nails, stones or other materials.
Check if tire surface or wall for crack or damaged, and replace it if necessary.
The tire tread depth can be checked by visual inspection or depth gauge.
Replace the tire if tire tread dent or unusual wearing out.
The tire should be replaced if the wear limit mark (△) is in visible.
Measure tire thread depth from tire center surface.
Replace the tire if the depth is not come with following specification:
Front tire: 1.5 mm
Rear tire: 2.0 mm
Caution
The wear limit marks (△) are located around the tire wall even for inspection.
Brake light switch
Wear limit indictor
〝△〞mark
2-14
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SYM 2. MAINTENANCE INFORMATION
Battery cover screws
BATTERY
Battery Removal
Remove the 4 screws on the floor panel.
Remove battery cap. (4 screws)
Battery cables removal:
1. At first, remove the negative “-” cable.
2. Then, remove the positive “+” cable.
3. Remove the battery.
If there is some rust on battery posts, clean it with steel brush.
Install the battery in the reverse procedures of removal.
Caution
If there is rust on the posts very serious, spray some hot water on the posts.
Then, clean it with steel brush so that can remove rust for more easily.
Apply some grease on the posts after rust removed to prevent from rust again.
HEADLIGHT ADJUSTMENT
Turn the headlight adjustment bolt. And adjust the headlight beam height.
Then, tighten the adjustment bolt after the beam height in proper position.
Caution
To adjust the headlight beam follows related regulations.
Improper headlight beam adjustment will make in coming driver dazzled or insufficient lighting.
NUTS, BOLTS TIGHTENESS
Perform periodical maintenance in accord with the Periodical Maintenance Schedule.
Check if all bolts and nuts on the frame are tightened securely.
Check all fixing pins, snap rings, hose (pipe) clamps, and wire holders for security.
Headlight adjustment bolt
2-15
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SYM 3. LUBRICATION SYSTEM
MECHANISM DIAGRAM ....................3-1
OPERATIONAL PRECAUTIONS .......3-2
TROUBLE DIAGNOSIS ......................3-2
ENGINE OIL .......................................3-3
MECHANISM DIAGRAM
Valve rocker arm
Scoop lubrication
Connecting rod
Forcedly lubrication
Crankshaft
CLEANING ENGINE OIL STRAINER... 3-3
OIL PUMP ............................................ 3-4
GEAR OIL ............................................ 3-7
Forcedly lubrication
Camshaft
Inner passage
Oil strainer
Oil pump
3-1
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3. LUBRICATION SYSTEM SYM
OPERATIONAL PRECAUTIONS
General Information
This chapter contains maintenance operations for the engine oil pump, engine oil and gear oil.
Oil viscosity
Specifications
Engine oil quantity Disassembly 850 c.c.
Replacement 750 c.c.
Oil viscosity SAE 10W-30 or equivalent
(Recommended King-Mate serial oils)
Gear Oil Disassembly 110 c.c.
Replacement 100 c.c.
Oil viscosity of gear oil SAE 85W-140
(Recommended King-Mate gear oil series SYM
HYPOID GEAR OIL) unit : mm
Inner rotor clearance
- 0.12
Oil pump
Clearance between outer rotor and body
Clearance between rotor side and body
Torque value
Engine oil drain plug
Engine oil screen cover
Gear oil drain bolt
Gear oil filling bolt
Oil pump drive sprocket nut
- 0.12
0.05~0.10 0.20
3.5~4.5kgf-m
1.0~2.0kgf-m
3.5~4.5kgf-m
1.0~1.4kgf-m
0.8~1.2kgf-m
TROUBLE DIAGNOSIS
Low engine oil level
Oil leaking
Valve guide or seat worn out
Piston ring worn out
Low Oil Pressure
Low engine oil level
Clogged in oil strainer, circuits or pipes
Oil pump damage
Dirty oil
No oil change in periodical
Cylinder head gasket damage
Piston ring worn out
3-2
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SYM 3. LUBRICATION SYSTEM
ENGINE OIL
Turn off engine, and park the motorcycle in flat ground with main stand.
Check oil level with oil dipstick after 3-5 minutes.
Do not rotate the dipstick into engine as checking.
If oil level is nearly low level, fill out recommended oil to upper level.
Oil Replacement
Caution
Drain oil as engine warmed up so that make sure oil can be drained smoothly and completely.
Place an oil pan under the motorcycle, and remove oil strainer cap.
Make sure if the aluminum washer of the draining bolt is damaged. If so, replace it with new one.
Install the drain bolt and tighten it.
Torque value: 3.5~4.5 kgf-m
CLEANING ENGINE OIL STRAINER
Remove the oil strainer cap.
Remove oil strainer and spring.
Clean oil strainer (recommended using compressed air to clean dirty foreign).
Check if the strainer and O-ring of the oil strainer are broken. Replace with new one if found.
Install the oil strainer and spring.
Install the oil strainer cap and tighten it.
Torque value: 1.0~2.0 kgf-m
Fill out oil to the oil filler (Oil viscosity SAE
10W-30) (Recommended King-Mate serial oils).
Engine oil quantity: Replacement 750 c.c.
Dipstick
Oil drain plug
Oil strainer cap
3-3
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3. LUBRICATION SYSTEM SYM
OIL PUMP
bolts
Oil Pump Removal
Remove the alternator (refer to chapter10).
Remove the engine right cover.
Remove the one-way clutch and starting gear (1 nut).
Make sure that the pump axle can be rotated freely.
Remove the oil pump cover (2 bolts), and then the oil pump driving gear nut and the gear and oil pump driver chain.
Remove oil pump body bolts (2 bolts).
Oil Pump Disassembly
Remove the screw on oil pump cover.
Disassemble the oil pump as illustration shown.
Right crankcase cover
Starting gear
Oil pump driving gear
Starting clutch
Oil strainer
Right crankcase
Oil pump outer cover
Oil pump driving chain
Oil pump body
Oil pump shaft
Outer rotor
Inner rotor
Oil pump cover
3-4
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SYM 3. LUBRICATION SYSTEM
Oil Pump Inspection
Check the clearance between oil pump body and outer rotor.
Limit: below 0.12 mm
Check clearance between inner and outer rotors.
Limit: below 0.12 mm
Check clearance between rotor side face and pump body.
Limit: below 2.0 mm
Oil Pump Re-assembly
Install inner and outer rotors into the pump body.
Align the indent on driving shaft with that of inner rotor. Install the driving shaft.
Install the oil pump cover and fixing pin properly and then tighten screw. (1 screw)
3-5
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3. LUBRICATION SYSTEM SYM
Oil Pump Installation
Install the oil pump (2 bolts).
Install oil pump driver chain and drive gear.
Install oil pump outer cover (2 bolts).
Install the starting gear and the alternator.
(Refer to chapter 10)
drive gear oil pump outer cover
Start drive gear
2 bolts oil pump driver chain
2 bolts
3-6
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SYM 3. LUBRICATION SYSTEM
GEAR OIL
Oil Level Inspection
Park the motorcycle on flat ground with main stand.
Turn off engine and remove both engine oil filling bolt and oil draining bolt.
Remove gear oil filling hole bolt and place a measurement cup under the draining plug.
Remove the oil draining plug and the pour gear oil into the measurement cup.
Measure the gear oil quantity if within standard value.
Add specified gear oil if the oil level too low.
Standard quantity: 110cc.
Replacement: 100 cc.
Gear Oil Replacement
Remove the gear oil filling hole bolt and its draining plug and then drain oil completely.
Install the draining plug and tighten it. (Make sure if the plug washer is damaged. If so, replace it with new one.)
Torque Value:3.5~4.5 kgf-m
Add new gear oil (100 c.c.) from the gear oil filling hole and then install the gear oil filling hole bolt after added oil. And then, tighten the bolt.
Torque Value: 1.0~1.4 kgf-m
※Recommended to apply with SYM
HYPOID GEAR OIL (SAE 85W-140)
Start engine and run it for 2~3 minutes.
Turn off engine and check if oil leaking.
Filling bolt
Draining bolt
3-7
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SYM 4. FUEL SYSTEM
MECHANISM ILLUSTRATION ............. 4-1
PRECAUTIONS IN OPERATION ......... 4-2
TROUBLE DIAGNOSIS ........................ 4-3
CARBURETOR REMOVAL .................. 4-4
VACUUM CHAMBER ........................... 4-4
AIR CUT-OFF VALVE ..........................4-6
MECHANISM ILLUSTRATION
Fuel strainer
Fuel unit
AUTO BY-STARTER .......................... 4-7
FLOAT CHAMBER ............................. 4-8
INSTALLATION OF CARBURETOR .. 4-9
IDLE SPEED ADJUSTMENT.............. 4-9
FUEL TANK ........................................ 4-10
AIR CLEANER.................................... 4-11
Carburetor
Fuel tank cap http://www.motorcycle.in.th
4-1
4. FUEL SYSTEM SYM
PRECAUTIONS IN OPERATION
General Information
Warning
Gasoline is a low ignition point and explosive materials, so always work in a well-ventilated place and strictly prohibit flame when working with gasoline.
Cautions
Do not bend or twist throttle valve cable. Damaged cable will make unstable driveability.
When disassembling fuel system parts, pay attention to O-ring position, replace with new one as re-assembly
There is a drain screw in the float chamber for draining residual gasoline.
Do not disassemble automatic by-starter and air cut-off valve arbitrarily.
Specification
Item Specification
Main jet
Slow jet
110#
35#
Idle speed
Fuel quantity adjustment screw
1700±100 rpm
2 1/8±3/4 turns
Level in float chamber 3.0±1 mm
Jet needle DB4E6 add 1 unit 0.5mm washer
Throttle handle free play 2~6 mm
Torque value
Fuel valve tightening nut: 1.5~2.0 Kgf-m
Tool
Special service tools
Vacuum/air pressure pump
General service tools
Fuel level gauge
4-2
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SYM 4. FUEL SYSTEM
TROUBLE DIAGNOSIS
Poor engine start
No fuel in fuel tank
Clogged fuel tube
Too much fuel in cylinder
No spark from spark plug (malfunction of ignition system)
Clogged air cleaner
Malfunction of automatic by-starter
Malfunction of throttle valve operation
Stall after started
Malfunction of automatic by-starter
Incorrect ignition timing
Malfunction of carburetor
Dirty engine oil
Air existing in intake system
Incorrect idle speed
Rough idle
Malfunction of ignition system
Incorrect idle speed
Malfunction of carburetor
Dirty fuel
Intermittently misfire as acceleration
Malfunction of ignition system
Late ignition timing
Malfunction of ignition system
Malfunction of carburetor
Power insufficiency and fuel consuming
Fuel system clogged
Malfunction of ignition system
Mixture too lean
Clogged fuel injector
Vacuum piston stick and closed
Malfunction of float valve
Fuel level too low in float chamber
Clogged fuel tank cap vent
Clogged fuel filter
Obstructed fuel pipe
Clogged air vent hose
Air existing in intake system
Mixture too rich
Clogged air injector
Malfunction of float valve
Fuel level too high in float chamber
Malfunction of automatic by-starter
Dirty air cleaner
4-3
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4. FUEL SYSTEM SYM
Carburetor Removal
Remove the luggage box.
Loosen the adjustment nut and fixing nut of throttle valve cable, and release the cable from carburetor.
Remove fuel pipe, vacuum hose.
Disconnect auto by-starter connectors.
Release the clamp strip of air cleaner.
Release the clamp strip of carburetor isolator.
Take the carburetor out.
VACUUM CHAMBER
Removal
Loosen drain screw, and drain out residual fuel in float chamber.
Remove screws (2 screws) of vacuum chamber cover and the cover.
Remove compress spring and vacuum piston. throttle valve cable auto by-starter
Vacuum Chamber cover
Vacuum piston vacuum hose clamp strip of isolator vacuum hose
Screws×2 compress spring
4-4
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SYM 4. FUEL SYSTEM
Remove fuel needle seat, spring, and injector needle.
Check if the vacuum piston for wear out, crack or other damage.
Check if the diaphragm for damage or crack.
Cautions
Do not damage vacuum diaphragm.
Installation
Install injector needle, spring and fuel needle seat to vacuum piston.
Cautions
Note direction as installing the piston set because wrong direction of the piston cab not be installed.
Align the indent of vacuum diaphragm with the carburetor body.
Install vacuum piston to carburetor body.
Install compress spring.
Install vacuum chamber cover and tighten 2 screws. fuel needle seat fuel needle spring injector needle piston piston diaphragm lock position
Piston spring screws×2
4-5
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4. FUEL SYSTEM SYM
AIR CUT-OFF VALVE
Removal
Remove the vacuum hose clamp and then the vacuum hose.
Remove the screws (screw x 2) of the air cut-off valve and its cover.
Remove the spring and vacuum diaphragm.
Check if the vacuum diaphragm for deterioration or crack.
Installation
Install the valve as reverse order of removal.
Cautions
Do not damage the vacuum diaphragm or in opposite installation direction.
Screws ×2 vacuum diaphragm screws
4-6
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SYM 4. FUEL SYSTEM
AUTO BY-STARTER
Inspection
Turn off engine and waiting for over 10 minutes for cooling.
Check resistance across the two terminals of the auto by-starter
Resistance value: Max. 10Ω (Measured
after engine stopped for more than 10
minutes)
Replace the auto by-starter with a new one if resistance value exceeds standard.
Remove the carburetor, allow it to cool off for
30 minutes.
Connect a hose to fuel richment circuit.
Pump compressed air to the circuit.
Replace the auto by-starter if the circuit clogged.
Connect battery posts (12V) to starter’s connectors. After 5 minutes, test the rich circuit with compressed air. If air flow through the circuit, then replace the starter.
Removal
Remove fixing plate screw, and then remove the plate and auto by-starter from carburetor.
Valve inspection
Check if auto by-starter and valve needle for damage or wear out.
Installation
Install auto by-starter to the carburetor body.
Install fixing plate to the upper groove of auto by-starter, and install its flat surface to carburetor. Install screw and tighten it.
Cautions
Align the round point of the starter with the screw hole of air intake side.
Screws
× 2 fixing plate
Screws × 2 fixing plate automatic by-starter round point valve needle
4-7
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4. FUEL SYSTEM SYM
FLOAT CHAMBER
Disassembly
Remove 4 mounting screws and then the float chamber cover.
Remove the float pin and float valve.
Checking
Check float needle valve and valve seat for drop difference damage, wear out, dirty or clogged.
Cautions
In case of worn out or dirt, the float valve and valve seat will not tightly close causing fuel level to increase and as a result, fuel flooding. A worn out or dirty float valve must be replaced with a new a new one.
Remove main jet, fuel needle jet holder, fuel needle jet, slow jet, fuel amount adjustment screw.
Cautions
Take care not to damage jets and adjust screw.
Before removing adjustment screw, turn it all the way down and note the number of turns.
Do not turn adjustment screw forcefully to avoid damaging valve seat face.
Clean jets with cleaning fluid.
Then use compressed air to blow dirt off.
Blow carburetor body passages with compressed air. float float pin float slow jet fuel am ount adjustmen t screw fuel needle jet float pin screws× 4 float needle valve float pin main jet fuel needle holder fuel needle jet fuel needle holder main jet slow jet
4-8
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SYM 4. FUEL SYSTEM
Installation
Install main jet, fuel needle jet seat, fuel needle jet, slow speed jet and fuel amount adjustment screw.
Cautions
Set the adjustment screw in according to number of turns noted before it was removed.
Install the float valve, float, and float pin.
Checking Fuel Level
Cautions
Check again to ensure float valve, float for proper installation.
To ensure correct measurement, position the float meter in such a way so that float chamber face is vertical to the main jet.
Fuel level: 3.0±1mm
INSTALLATION OF CARBURETOR
Install carburetor in the reverse order of removal.
Following adjustments must be made after installation.
Throttle valve cable clearance adjustment
Idle speed adjustment
IDLE SPEED ADJUSTMENT
Caution
Fuel amount adjust screw was set at factory, so no adjustment is needed. Note the number of turns it takes to screw it all the way in for ease of installation.
Never screw in forcedly to avoid damaging the screw seat.
The main stand must be used to support the motorcycle to perform the adjustments.
Use a tachometer when adjusting engine RPM.
Screw in adjustment screw gently, then back up to standard turns.
Standard turns: 2 1/8±3/4 turns
Warm up engine, adjust throttle valve stopper screw to standard RPM.
Idle speed rpm: 1700±100 rpm
Connect the sampling hose of exhaust analyzer to exhaust front end. Press test key on the analyzer.
Adjust the air volume adjustment screw and read
CO reading on the analyzer.
CO standard value: 1.0~1.5 %
Accelerate in gradual increments, make sure both rpm and CO value are in standard values after engine running in stable. If rpm and CO value fluctuated, repeat the procedures described above for adjusting to standard value.
float meter
Throttle valve cable adjustment nut fuel amount adjustment screw throttle valve stopper screw air volume adjustment screw
4-9
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4. FUEL SYSTEM SYM
FUEL TANK
Fuel unit removal
Open the seat.
Remove the luggage box. (6 bolts)
Remove the engine starter control switch wire connector .
Disconnect fuel unit connector.
Remove fuel unit.
Cautions
Do not bend the float arm of fuel unit.
Do not fill out too much gasoline to fuel tank.
Fuel unit inspection. (Refer to chapter 16 - electrical equipment).
Fuel unit installation
Install the gauge in the reverse order of removal.
Cautions
Do not forget to install the gasket of fuel unit or damage it.
FUEL TANK REMOVAL
Open the seat.
Remove the luggage box assembly (6 bolts).
Disconnect the engine start control switch connector.
Disconnect the fuel unit connector.
Remove the fuel pipe, fuel filter.
Remove the fuel tank (2 bolts).
Fuel Tank Installation
Install the tank in the reverse order of removal. fuel unit gasket
Fuel unit connector
4-10
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SYM 4. FUEL SYSTEM
AIR CLEANER
Removal
Remove the seat .
Remove the luggage box assembly (6 bolts).
Disconnect the engine start control switch connector.
Loosen the clamp strip of air cleaner.
Remove evaporative return hose.
Remove the air cleaner body bolts (2 bolts).
Remove the air cleaner.
Installation
Install the air cleaner in the reverse order of removal.
Air Cleaner Element Cleaning
Remove the air cleaner cover (6 screws).
Remove the air cleaner element (2 screws).
With compressed air to clean dirty around the element. Replace it if it is too dirty to clean.
Cautions
The air cleaner element is made of paper so do not soap it into water or wash it with water. screws×2 air filter strap bolts×2 screws×6
Air cleaner element
4-11
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SYM 5. REMOVAL OF ENGINE
MECHANISM DIAGRAM ...................... 5-1
OPERATIONAL PRECAUTIONS ......... 5-2
REMOVAL OF ENGINE SUSPENSION BUSHING
. 5-6
ENGINE SUSPENSION FRAME.......... 5-7
ENGINE REMOVAL ............................. 5-3
MECHANISM DIAGRAM
4.5~5.5 kgf-m
2.4~3.0kgf-m
INSTALLATION OF ENGINE ............... 5-8
4.5~5.5kgf-m
3.5~4.5kgf-m
4.5~5.5kgf-m
5-1
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5. REMOVAL OF ENGINE SYM
OPERATIONAL PRECAUTIONS
General Information
Engine must be supported by a bracket or adjustable tool in height.
The following parts can be serviced with the engine installed on the frame.
1. Carburetor
2. Driving disk, driving belt, clutch, and transporting disk
3. Final reduction gear mechanism
Specification
Engine Oil Capacity
Gear Oil Capacity
Torque Values
Engine suspension bolt (frame side)
Engine suspension nut (engine side)
Bolt of rear shock absorber upper connection
Bolt of rear shock absorber lower connection
Specification
4.5~5.5kgf-m
4.5~5.5kgf-m
3.5~4.5kgf-m
2.4~3.0kgf-m
5-2
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SYM 5. REMOVAL OF ENGINE
ENGINE REMOVAL
Open the seat.
Remove the luggage box assembly (4 bolts ).
Remove the body cover .
Remove the power connector of auto by- start.
Remove the generator wire and pulse generator connector.
Remove the starter motor wire on the Starter magnetic switch.
Remove the spark plug.
Generator connector pulse generator connector
Auto by-start connector
Starter magnetic switch
Spark plug
5-3
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5. REMOVAL OF ENGINE SYM
Remove the fuel pipe, vacuum hose, and throttle valve cable from the carburetor.
Loose the strap screw of the air cleaner guide, and then the air cleaner guide.
Remove the exhaust muffler (Bolts ×
2, Nuts × 2).
Remove the rear wheel (Nut × 1).
Remove the air cleaner connection bolts (2 bolts).
Bolts×2
Nut ×1 bolts×2
5-4
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SYM 5. REMOVAL OF ENGINE
Remove the rear brake cable nut.
Remove the rear brake cable.
Remove the rear shock absorber lower bolt.
Loose the strap screw of engine left guide, and then remove the engine left guide.
Remove the engine suspension nut and bolt
(engine side), and then remove the engine.
Caution
With a bracket to support the engine to prevent from it damage by falling down as removing the engine.
Check if the engine suspension, rear shock absorber bushing, and cushion rubber for damage. Replace them with new ones if so.
Rear shock absorber bolt
Strap screw of guide
Engine suspension bolt/nut
Brake cable nut
Bushing
5-5
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5. REMOVAL OF ENGINE SYM
REMOVAL OF ENGINE
SUSPENSION BUSHING
If engine suspension frame and the cushion rubber of rear shock absorber bushing damaged. Then, with the bushing remover / presser, Φ28mm &Φ20mm, to press the bushing out, and replace it with new one.
Engine suspension bushing: Φ28mm
Rear shock absorber bushing: Φ20mm
Pressing out
Place the detent section of the bushing remover toward the bushing, and drive both the pressing ring and bolt in to press the bushing out.
Pressing In
Place the flat section of the remover toward the bushing, and then drive the bushing, pressing ring, and bolt in to install the bushing.
5-6
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SYM 5. REMOVAL OF ENGINE
ENGINE SUSPENSION FRAME
Removal
Remove the right side bolt of engine suspension frame.
Remove the left side bolt of engine suspension frame.
Check if the engine suspension frame bushing and cushion rubber for damage. If so, replace with new ones.
Installation
Tighten the bolts and nuts of engine suspension frame.
Engine suspension frame nut:
Torque Value: 4.5~5.5 kgf-m
Bolt of engine suspension frame (left side)
5-7
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5. REMOVAL OF ENGINE SYM
INSTALLATION OF ENGINE
Check if the bushings of engine suspension frame and shock absorber for damaged. If so, replace with new ones.
Install the engine according to the reversing order of removal.
Engine suspension nut×1
Caution
Notice both feet and hands safety for squeezing as engine installation.
Do not bent or squeeze each wires or hose.
Route all cables and wires in accordance with the routine layout.
Engine suspension nut:
Torque Value: 4.5~5.5kgf-m
Rear shock absorber bolt:
Torque Value: Top: 3.5~4.5kgf-m lower: 2.4~3.0kgf-m
Rear wheel axle nut:
Torque Value: 11.0~13.0kgf-m
Rear shock absorber lower bolt
Brake cable nut
Rear wheel axle nut×1
5-8
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SYM 6. CYLINDER HEAD/VALVE
MECHANISM DIAGRAM ....................6-1
PRECAUTIONS IN OPERATION .......6-2
TROUBLE SHOOTING.......................6-3
CAMSHAFT REMOVAL .....................6-4
CYLINDER HEAD REMOVAL ............6-6
CYLINDER HEAD DISASSEMBLY ....6-7
MECHANISM DIAGRAM
1.0~1.4 kgf-m
1.0~1.4 kgf-m
CYLINDER HEAD INSPECTION.......... 6-8
VALVE SEAT INSPECTION AND SERVICE
6-10
CYLINDER HEAD REASSEMBLY ....... 6-12
CYLINDER HEAD INSTALLATION ...... 6-13
CAMSHAFT INSTALLATION ............... 6-13
VALVE CLEARANCE ADJUSTMENT .. 6-14
1.0~1.5 kgf-m
1.8~2.2 kgf-m
0.8~1.2 kgf-m
6-1
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6. CYLINDER HEAD/VALVE SYM
PRECAUTIONS IN OPERATION
General Information
This chapter is contained maintenance and service for cylinder head, valve, and camshaft as well as valve rocker arm.
Cylinder head service cannot be carried out when engine is in frame.
Camshaft
Rocker arm
Compression pressure 13 kgf/cm² -
Height of cam lobe
Intake 25.965 25.290
Exhaust 25.81 25.120
ID of valve rocker arm 10.00 10.000~10.015
OD of valve rocker arm shaft 10.00 9.985~10.00
Intake 5.00 4.975~4.99
OD of valve stem
Exhaust 5.00 4.97~4.98
Valve
OD of Guide
Clearance between valve stem and guide
5.00 5.030
Intake 0.020~0.045 0.080
Exhaust 0.030~0.057 0.100
Free length of valve spring
Valve seat width
Outer 32.56 32.26
Inner 35.25 34.75~35.75
1.000 1.600
Connection Flatness of cylinder head
Torque Value
Cylinder head cover bolts
Holder nuts
Cylinder head bolts
Valve adjustment fixing nuts
Camshaft chain auto-adjuster bolts
Timing gear cover bolts
Spark plug
TOOLS
- 0.050
0.8~1.2kgf-m
1.0~1.5kgf-m
0.8~1.2kgf-m
1.0~1.5kgf-m
0.8~1.2kgf-m
0.7~1.1kgf-m (apply with oil on bolt thread & seat)
1.0~1.4kgf-m
Special service tools
Valve reamer: 5.0mm
Valve guide driver: 5.0mm
Valve spring compressor
6-2
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SYM 6. CYLINDER HEAD/VALVE
TROUBLE SHOOTING
Engine performance will be effected by troubles on engine top end. The troubles usually can be determinate or by performing cylinder compression test and judging the abnormal noise generated.
Rough Idle
Low compression pressure.
Low compression pressure
1. Valve
Improper valve adjustment.
Burnt or bended valve.
Improper valve timing.
Valve spring damaged.
Valve carbon.
Poor sealing on valve seat.
Improper spark plug installation.
2. Cylinder head
Cylinder head gasket leaking or damage.
Tilt or crack cylinder surface.
3. Piston
Piston ring worn out.
High compression pressure
Too much carbon deposit on combustion chamber or piston head.
Noise
Improper valve clearance adjustment
Burnt valve or damaged valve spring
Camshaft wear out or damage
Cam chain wear out or looseness
Auto-adjuster wear out or damage of cam chain
Camshaft sprocket wear out
Rocker arm or rocker arm shaft wear out
White smoke
Valve guide or valve stem wear out
Valve stem seal wear out
6-3
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6. CYLINDER HEAD/VALVE SYM
CAMSHAFT REMOVAL
Remove the shroud of the engine.
Remove the crankcase blow-by system hose from the cylinder head.
Remove the cylinder head bolts and then remove the cylinder head (4 bolts).
Loosen the screw of camshaft chain adjuster and remove O-ring.
With a flat screwdriver to tighten the screw of camshaft chain adjuster in a clockwise motion for release adjuster.
Turn the flywheel in counter clockwise motion with T type wrench until the “T” mark on flywheel aligned with the mark on the crankcase so that the hole on the camshaft sprocket is forward up and piston is at TDC position.
Remove camshaft holder nut and washer.
Caution
Loosen the nuts diagonally by 2-3 sequences.
Blow-by hose
A.I
camshaft chain adjuster
4 nuts
Hole
4 bolts screw
TDC mark
6-4
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SYM 6. CYLINDER HEAD/VALVE
Remove the camshaft holder and rocker arm set.
Remove the camshaft chain from the camshaft sprocket.
Remove the camshaft.
Camshaft Inspection
Inspect cam lobe height for damaged.
Service Limit
IN: Replacement when less than 25.29 mm
EX: Replacement when less than 25.12 mm
Inspect the camshaft bearing for looseness or wear out. If any, replace whole set of camshaft and bearing.
Disassembly Of Camshaft Holder
With a 5 mm bolt to screw in the cam rocker arm shaft so that take it out.
Remove cam rocker arm.
Inspection Of Camshaft Holder
Check if the camshaft holder, cam rocker arm and rock arm shaft for wearing out or damage.
Caution
Further check is necessary if any wear is found on the moveable surface of cam rocker arm.
Check if the camshaft bearing mounting surface for wear or damage.
Measure the cam rocker arm I.D. of the camshaft holder.
Service Limit: Replace when it is above
12.10 mm
Camshaft bearing
5mm
bolt rocker arm shaft rocker arm shaft rocker arm
6-5
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6. CYLINDER HEAD/VALVE SYM
Measure the valve rocker arm I.D.
Service Limit: Replace when it is above
10.100 mm
Measure the active O.D. of the valve rocker arm shaft and valve rocker arm.
Service Limit: Replace when it is above
9.910 mm
Calculate the clearance between the rocker arm shaft and the rocker arm.
Service Limit: Replace when it is above
0.10 mm
CYLINDER HEAD REMOVAL
Remove double seat, luggage box and front center cover.
Remove the engine (refer to Chapter 5).
Remove the cooling fan cover.
Remove the engine shroud (4 bolts).
Remove the camshaft (refer to page 6-4).
Blow-by hose
6-6
A.I
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4 bolts
SYM 6. CYLINDER HEAD/VALVE
Remove the 2 cylinder head mounting bolts from cylinder head left side cover.
Remove cylinder head gasket and 2 dowel pins.
Remove chain plate.
Clean up residues from the matching surfaces of cylinder and cylinder head.
dowel pins
Caution
Do not damage the matching surfaces of cylinder and cylinder head.
Avoid residues of gasket or foreign materials falling into crankcase as cleaning.
CYLINDER HEAD DISASSEMBLY
Use a valve compressor to press the valve spring.
After removed valve cotters, release the compressor and then take out spring retainer, valve spring and valves.
valve cotters
Caution
In order to avoid to loosing spring tension, do not compress the spring too much. Its length is based on the installation of latch.
Special Service Tool: Valve spring compressor.
Remove valve stem guide seal.
Clean carbon deposits in combustion chamber.
Clean residues and foreign materials on cylinder head matching surface.
Caution
Do not damage the matching surface of cylinder head.
Chain plate
Cylinder head gasket
6-7
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6. CYLINDER HEAD/VALVE SYM
CYLINDER HEAD INSPECTION
Check if spark plug and valve holes are crack.
Measure cylinder head flat with a straightedge and flat feeler gauge.
Service limit: 0.5mm
Valve spring free length
Measure the free length of intake and exhaust valve springs.
Standard
Outer : 35.250 mm
Inner : 32.410 mm
Valve stem
Check if valve stems are bend, crack or burn.
Check the operation condition of valve stem in valve guide, and measure & record the valve stem outer diameter.
Service Limit: IN→ 4.900mm
EX→ 4.900mm
Valve guide
Caution
Before measuring the valve guide, clean carbon deposits with reamer.
Special Service Tool: 5.0mm valve guide reamer
Measure and record each valve guide inner diameters.
Service limit: 5.030mm
The difference that the inner diameter of valve guide deducts the outer diameter of valve stem is the clearance between the valve stem and valve guide.
Service Limit: IN→ 0.08mm
EX→ 0.10mm
6-8
The narrow pitch of the spring shall face to the combustion chamber.
5.0mm valve guide reamer
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SYM 6. CYLINDER HEAD/VALVE
Caution
If clearance between valve stem and valve guide exceeded service limit, check whether the new clearance that only replaces new valve guide is within service limit or not. If so, replace valve guide.
Correct it with reamer after replacement.
If clearance still exceeds service limit after replaced valve guide, replace valve stem too.
Caution
It must correct valve seat when replacing valve guide.
Valve guide replacement
Heat up cylinder head to 100~150 ℃ with heated plate or toaster.
Valve guide driver
5.0mm
Caution
Do not let torch heat cylinder head directly. Otherwise, the cylinder head may be deformed as heating it.
Wear on a pair of glove to protect your hands when operating.
Hold the cylinder head, and then press out old valve guide from combustion chamber side.
Tool: Valve guide driver 5 mm
Caution
Check if new valve guide is deformation after pressed it in.
When pressing in the new valve guide, cylinder head still must be kept in
100~150 ℃.
Adjust the valve guide driver and let valve guide height is in 13mm.
Press in new valve guide from rocker arm side.
Tool: Valve guide driver 5 mm
Wait for the cylinder head cooling down to room temperature, and then correct the new valve guide with reamer.
13 mm
(0.15in)
Caution
Using cutting oil when correcting valve guide with a reamer.
Turn the reamer in same direction when it be inserted or rotated.
Correct valve seat, and clean up all metal residues from cylinder head.
Special tool: Valve guide reamer 5 mm
Valve guide reamer 5.0mm
Valve guide driver
5.0mm
6-9
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6. CYLINDER HEAD/VALVE SYM
VALVE SEAT INSPECTION AND
SERVICE
Clean up all carbon deposits onto intake and exhaust valves.
Apply with emery slightly onto valve contact face. Grind valve seat with a rubber hose or other manual grinding tool.
Caution
Do not let emery enter into between valve stem and valve guide.
Clean up the emery after corrected, and apply with red paint onto contact faces of valve and valve seat.
Remove the valve and check its contact face.
Caution
Replace the valve with new one if valve seat is roughness, wear out, or incomplete contacted with valve seat.
If the valve and the valve seat still can not be matched sealing after grinded, replace it with new one.
Valve seat inspection
If the valve seat is too width, narrow or rough, correct it.
Valve seat width
Service limit: 1.6mm
Check the contact condition of valve seat.
Valve seat grinding
The worn valve seat has to be grinded with valve seat chamfer cutter.
Use 45° valve seat chamfer cutter to cut any rough or uneven surface from valve seat.
Caution
After valve guide had been replaced, it has to be grinded with 45° valve seal chamfer cutter to correct its seat face.
Use 32° cutter to cut a quarter upper part out.
Roughness
45°
Valve seat valve seat width
Old valve seat width
32°
6-10
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SYM 6. CYLINDER HEAD/VALVE
Use 60° cutter to cut a quarter lower part out.
Remove the cutter and check new valve seat.
Use 45° cutter to grind the valve seat to specified width.
Caution
Make sure that all roughness and uneven faces had been grinded.
Grind valve seat again if necessary.
Coat the valve seat surface with red paint.
Install the valve through valve guide until the valve contacting with valve seat, slightly press down the valve but do not rotate it so that a seal track will be created on contact surface.
Caution
The contact surfaces of valve and valve seat are very important to the valve sealing capacity.
If the contact surface too high, grind the valve seat with 32° cutter.
Then, grind the valve seat with 45° cutter to specified width.
If the contact surface too low, grind the valve seat with 60° cutter.
Then, grind the valve seat with 45° cutter to specified width.
Contact surface too low
Old valve seat width
1.0mm
Contact surface too high
60°
45°
Old valve seat width
32°
Old valve seat width
60°
6-11
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6. CYLINDER HEAD/VALVE SYM
After the valve seat grinded, coat valve seat surface with emery and then slightly press the grinded surface.
Clean up all emery coated onto cylinder and valve after grinded.
CYLINDER HEAD REASSEMBLY
Lubricate valve stem with engine oil, and then insert the valve into valve guide.
Install new valve stem oil seal.
Install valve springs and retainers.
Caution
The closed coils of valve spring should face down to combustion chamber.
Use valve spring compressor to press valve spring.
Install valve split locks and release the valve compressor.
Caution
In order to avoid to loosing spring tension, do not compress the spring too much. Its length is based on the installation of latch.
Special tool: valve spring compressor
Tap valve stem to make valve retainer and valve stem sealing properly.
Caution
Place and hold cylinder head on to working table so that can prevent from valve damaged.
Valve cotters
Valve spring retainer
Valve spring
Valve stem oil seal
Valve
6-12
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SYM 6. CYLINDER HEAD/VALVE
CYLINDER HEAD INSTALLATION
Install the lock pins and new cylinder head gasket onto the cylinder head.
Install the camshaft chain plate.
Install the cylinder head.
CAMSHAFT INSTALLATION
Assemble the camshaft holder.
Install the exhaust valve rocker arm set onto the camshaft holder showing “EX” mark.
Install intake valve rocker arm and rocker arm shaft.
Caution
The tangent of rocker shaft of intake valve should match with the bolt hole of camshaft mounting seat.
With T type wrench to turn crankshaft in a clockwise motion so that the “T” mark on the flywheel aligns with the mark on crankcase.
(piston is at TDC position)
Place the TDC marks of the cam sprocket at same level of the top-end of cylinder head.
The other single hole of the cam sprocket is in upward. Then, install the cam chain onto the cam sprocket.
Lock pins
5mm blot
Camshaft
Rocker arm shaft
Cylinder head gasket
Chain plate
Rocker arm
Cam chain
6-13
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6. CYLINDER HEAD/VALVE SYM
Install the lock pins.
Install the camshaft holder, gasket and nut onto the cylinder head.
Tighten the cylinder head nuts. (4 nuts)
At first, tighten the 4 nuts on the cylinder top and then tighten the 2 bolts on the left side of cylinder head.
Torque value: 1.8~2.2 kgf-m
Install the spark plug and tighten it.
Torque value: 1.0~1.4 kgf-m
Caution
Apply with oil onto the thread of cylinder head bolts and tighten the bolts in diagonally for 2-3 sequences.
Do not over tightening the bolts to avoid the cylinder head deformation, noise created or leaking so that effects motorcycle’s performance.
VALVE CLEARANCE ADJUSTMENT
Loosen valve clearance adjustment nuts and bolts located on valve rocker arm.
Measure and adjust valve clearance with feeler gauge.
After valve clearance had been adjusted to standard value, hold adjustment bolt and then tighten the adjustment nut.
Standard Value:
0.12±0.02/ 0.12±0.02 mm
With flat screwdriver, turn the cam sprocket adjuster in counter-clockwise motion so that the adjuster is pushed out to contact the cam chain plate tightly. Apply with oil onto a new
O-ring and then install it onto the adjuster hole. Tighten the bolt cap of the adjuster adjustment hole.
Caution
The O-ring must be installed into glove.
Replace the O-ring of the cylinder head with new one. Install the cylinder head.
Tighten the cylinder head lock bolts.
Connect the blow-by hose onto the cylinder head.
Tighten the 2 nd
air injection (AI) nut.
Install the engine onto the engine frame.
(Refer to Chapter 5) pin holder
Especial tool
Blow-by hose
A.I
6-14
4 bolts
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SYM 7. CYLINDER/PISTON
MECHANISM DIAGRAM ....................7-1
PRECAUTIONS IN OPERATION .......7-2
TROUBLE DIAGNOSIS ......................7-2
CYLINDER REMOVAL .......................7-3
PISTON REMOVAL............................7-5
MECHANISM DIAGRAM
0.8~1.2kgf-m
PISTON RING INSTALLATION..........7-7
PISTON INSTALLATION....................7-8
CYLINDER INSTALLATION .............. 7-8
7-1
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7. CYLINDER/PISTON SYM
PRECAUTIONS IN OPERATION
General Information
Both cylinder and piston service cannot be carried out when engine mounted on frame.
Cylinder
Bend/wrap age
-
0.050
Piston/
Piston ring
Clearance between piston rings
Ring-end gap
OD of piston
Top ring
2 nd
ring
Top ring
2 nd
ring
Oil ring
Piston OD measurement position
Clearance between piston and cylinder
ID of piston pin hole
OD of piston pin
Clearance between piston and piston pin
0.025~0.060
0.015~0.050
0.200~0.400
0.250~0.400
0.200~0.700
52.370~52.390
Lower-end up 7mm of piston skirt
0.090
0.090
0.500
0.650
-
52.300
-
0.010~0.040 0.100
15.002~15.008
14.994~15.000
0.002~0.014
15.040
14.980
0.060
TROUBLE DIAGNOSIS
Low Or Unstable Compression Pressure
Cylinder or piston ring worn out.
Compress pressure to high.
Too much carbon deposited in combustion chamber and piston.
Knock or Noise
Cylinder or piston ring worn out.
Carbon deposits on cylinder head top-side.
Piston pin hole and piston pin wear out.
Smoking in Exhaust Pipe
Piston or piston ring worn out.
Piston ring installation improperly.
Cylinder or piston damage.
Engine Overheat
Carbon deposits on cylinder head top side.
7-2
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SYM 7. CYLINDER/PISTON
CYLINDER REMOVAL
Remove cylinder head. (refer to chapter 6)
Remove 2 bolts and then take out the cam chain auto-adjuster.
Remove cam chain plate.
Remove cylinder.
Remove cylinder gasket and lock pins
Clean the residues attached onto the matching surfaces of cylinder and crankcase.
Cylinder
Cam chain guide
2 bolts
Cam chain auto-adjuster
7-3
http://www.motorcycle.in.th
7. CYLINDER/PISTON SYM
Cover the holes of crankcase and cam chain with a piece of cleaning cloth.
Clean up all residues or foreign materials from the two matching surfaces of cylinder and crankcase.
Caution
To soap the residues into solvent so that the residues can be removed more easily.
INSPECTION
Check if the inner diameter of cylinder is worn out or damaged.
In the 3 positions (top, center and bottom) of cylinder, measure the X and Y direction values respective in the cylinder.
Service limit: 58.00mm
Calculate both the real roundness (the difference between X and Y motion values) and the cylindrical roundness (the difference in the top, center or bottom positions of X or Y motion values.). Then, determinate by the max. value.
Service limit
Real roundness: correct or replace as over 0.05 mm
Cylindrical roundness: correct or replace
as over 0.05 mm
Check Cylinder flat.
Service limit: correct or replace as over
0.05 mm
Exhaust side
Top
Center
Bottom
Intake side
7-4
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SYM 7. CYLINDER/PISTON
PISTON REMOVAL
Plug crankcase opening with a cleaning cloth to prevent from piston pin snap ring or other parts falling into crankcase when disassembling.
Hold another snap ring with pliers.
Push out the piston pin from the side that not removed the snap ring.
Remove piston rings.
Caution
Pay attention to remove piston rings because they are fragile.
Disassemble the piston rings.
Check if the piston rings are damaged or its grooves are worn.
Cleaning the carbon in piston ring grooves.
Install the piston rings and then measure clearance between piston ring and its grooves.
Service Limit: Top ring: replace if over
0.09mm
2nd ring: replace if over
0.09mm
Take out the piston rings and place them respective into cylinder below 20mm of cylinder top. Measure each piston ring gaps.
Caution
Push the piston rings into cylinder with piston top-end in parallel motion.
Service Limit: Top ring: replace if over
0.50mm
2nd ring: replace if over
0.650mm
Piston piston ring
Piston ring
Push in
Feeler gauge
Feeler gauge
7-5
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7. CYLINDER/PISTON SYM
Measure the outer diameter of piston pin.
Service Limit: 14.980mm
Measure the inner diameter of connecting rod small end.
Service Limit: 15.06mm
Measure the inner diameter of piston pin hole.
Service Limit: 15.04mm
Calculate clearance between piston pin and its hole.
Service Limit: 0.02mm
Measure piston outer diameter.
Caution
The measurement position is 10 mm distance from piston bottom side, and 90° to piston pin.
Service limit: 52.30mm
Compare measured value with service limit to calculate the clearance between piston and cylinder.
7-6
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SYM 7. CYLINDER/PISTON
PISTON RING INSTALLATION
Clean up piston top, ring groove, and piston shirt.
Install the piston ring onto piston carefully.
Place the openings of piston ring as diagram shown.
Caution
Do not damage piston and piston rings as installation.
All marks on the piston rings must be forwarded to up side.
Make sure that all piston rings can be rotated freely after installed.
Top ring
2nd ring
Side ring
Spacer
Side ring
Over 20 mm
120°
Top groove
Oil ring
2nd groove
Oil groove
7-7
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7. CYLINDER/PISTON SYM
PISTON INSTALLATION
Install piston and piston pin, and place the IN mark on the piston top side forward to intake valve.
Install new piston pin snap ring.
Caution
Do not let the opening of piston pin snap ring align with the opening piston ring.
Place a piece of cleaning cloth between piston skirt section and crankcase in order to prevent snap ring from falling into crankcase as operation.
CYLINDER INSTALLATION
Clean up all residues and foreign materials on the matching surface of crankcase.
Pay attention to not let these residues and foreign materials fall into crankcase.
Caution
To soap the residues into solvent so that the residues can be removed more easily.
Install 2 lock pins and new gasket.
Coat engine oil to inside of cylinder, piston and piston rings.
Care to be taken when installing piston into cylinder. Press piston rings in one by one as installation.
Caution
Do not push piston into cylinder forcefully because this will cause the piston and the piston rings to be damaged.
Install the cam chain plate, the cylinder gasket and lock pins.
Install cylinder head. (refer to Chapter 6)
Install the cam chain auto-adjuster. (2 bolts)
Piston pin
IN mark
Piston
2 bolts
7-8
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
MECHANISM DIAGRAM ....................8-1
MAINTENANCE DESCRIPTION ........8-2
TROUBLE DIAGNOSIS ......................8-2
KICK STARTER ARM ........................ 8-3
DRIVING BELT................................... 8-4
SLIDING PULLEY .............................. 8-6
LEFT CRANKCASE COVER ..............8-3
MECHANISM DIAGRAM
CLUTCH/DRIVEN PULLEY............... 8-9
5.0~6.0kgf-m
5.0~6.0kgf-m
5.0~6.0kgf-m
0.8~1.2kgf-m
8-1
http://www.motorcycle.in.th
8. V-BELT DRIVING SYSTEM/KICK STARTER ARM SYM
MAINTENANCE DESCRIPTION
PRECAUTIONS IN OPERATION
GENERAL INFORMATION
• Driving pulley, clutch, and driven pulley can be serviced on the motorcycle.
• Driving belt and driving pulley surface must be free of grease.
Specification
Unit: mm
Driving belt width
ID of sliding pulley bushing
OD of sliding pulley hub
OD of roller
ID of clutch outer
Thickness of clutch lining
19.000
23.989~24.052
17.500
24.060
23.960~23.974 23.940
17.920~18.080 17.400
125.000~125.200 125.500
2.000 1.500
Free length of driving pulley spring
168.900 163.700
OD of driving pulley
33.965~33.985 33.940
ID of sliding pulley
34.000~34.025 34.060
ID: Inner Diameter
OD: Outer diameter
Torque value
Sliding pulley nut: 5.0~6.0kgf-m
Clutch outer nut: 5.0~6.0kgf-m
Driving pulley nut: 5.0~6.0kgf-m
Left crankcase cover bolts: 0.8~1.2kgf-m
Special Service Tools
Clutch spring compressor
Bearing puller (inner type)
Clutch mounting nut wrench
Universal fixture
TROUBLE DIAGNOSIS
Engine can be started but motorcycle can not be moved
1. Worn driving Belt
2. Worn tilt plate
3. Worn or damaged clutch lining
4. Broken driven pulley
Shudder or misfire when driving
1. Broken clutch lining
2. Worn clutch lining
Insufficient horsepower or poor high speed performance
1. Worn driving belt
2. Insufficient spring capacity of driven pulley
3. Worn roller
4. Driven pulley operation un-smoothly
8-2
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
air cleaner lock nut
LEFT CRANKCASE COVER
Left crankcase cover removal
Remove air cleaner. (2 bolts)
Remove kick starter arm. (1 bolt)
Loosen vent strap on the front-left side of cover, and then remove the vent.
Remove engine left-side cover (8 bolts). kick starter arm
Driving gear
KICK STARTER ARM
Disassembly
Remove the return spring plate (1 bolt), and remove return spring, starter shaft.
Remove driving gear, friction spring and washer.
Inspection
Check if starter shaft, driving gear, socket and bearing hole for wear or damage.
Replace it with new one if necessary.
Check the return spring and friction spring for spring force or damaged. Replace it with one if poor parts found.
Reassembly
Apply with some specified grease on the gear, socket, shaft.
Install the friction spring of driving gear onto convex part of the case.
Install socket, return spring and starter shaft as diagram shown.
Install kick starter arm temporary.
Rotate the lever and then align driving gear with width-tooth on the starter shaft.
Install thrust washer and socket onto starter shaft.
Installation of the left crankcase cover
Install the left crankcase cover. (8 bolts)
Install front vent tube of left cover and tighten the strap.
Install kick starter arm. (1 bolt)
Tighten the air cleaner. (2 bolts)
Install the air cleaner. (6 bolts)
Friction spring
driving gear
Kick starter arm
Starter shaft
Return spring
starter shaft gear kick starter arm
8-3
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8. V-BELT DRIVING SYSTEM/KICK STARTER ARM SYM
DRIVING BELT
Removal
Remove left crankcase cover.
Hold the driving pulley with a universal fixture, and then remove the nut and driving pulley.
Hold driving pulley with universal fixture, and remove nut and clutch outer.
Caution
Using special service tools for tightening or loosening the nut. Fixed rear wheel or rear brake only will damage reduction gear system.
Push the driving belt into belt groove as diagram shown so that the belt can be loosened, and then remove.
Driving belt and clutch at same time.
Inspection
Check the driving belt for crack or wear.
Replace it if necessary.
Measure the width of driving belt as diagram shown. Replace the driving belt if it exceed maintenance limited specification.
Service Limit: 19.0mm
Caution
Using the genuine parts for replacement.
The surfaces of driving belt or pulley must be free of grease.
Clean up all grease or dirt before installation.
Driving belt
Tooth
Universal fixer
Universal fixer
Width
Nut
8-4
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
Installation
Pull out the driving pulley and then insert the driving pulley.
Caution
Pull out driving pulley and then insert the driving belt into the driving pulley so that the driving belt set can be installed onto sliding pulley more easily.
Install the clutch set with driving belt onto the driving shaft.
Install the sliding pulley on the other end of belt.
Install clutch outer.
Install the clutch with universal fixture, and then tighten nut to specified torque value.
Torque value: 5.0~6.0 kgf-m
Caution
When install the driving belt, if there is a arrow mark, then the arrow mark must point to rotation motion. If not, the letters on the belt must be forwarded to assembly direction.
Nut
Universal fixer
Sliding driven pulley
Clutch outer
8-5
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8. V-BELT DRIVING SYSTEM/KICK STARTER ARM SYM
SLIDING PULLEY
REMOVAL
Remove left crankcase cover.
Hold driving pulley with universal fixture, and then remove driving pulley nut.
Remove driving pulley.
Remove the driving belt from the pulley.
Remove sliding pulley set and driving pulley hub from crankshaft.
Remove tilt plate.
Remove weight rollers from sliding pulley.
Crankshaft
Tilt plate
Sliding pulley
Universal fixture
Sliding pulley
Driving pulley hub
8-6
Roller
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
Inspection
The operation of sliding pulley is means of the weight roller to pressing on it with centrifuge force. And then the speed is changed by the title plate rotation. Thus, if weight rollers are wear out or damage, the centrifuge force will be effected.
Check if rollers are wear out or damage.
Replace it if necessary.
Measure each rollers’ outer diameter.
Replace it if exceed the service limit.
Service limit: 19.50 mm
Check the pulley hub if damaged or wear out.
Replace it if necessary.
Measure the pulley hub’s outer diameter.
Replace it if exceed the service limit.
Service limit: 23.94 mm
Measure the pulley hub’s inner diameter.
Replace it if exceed the service limit.
Service limit: 24.06 mm
Assembly/Installation
Install the weight rollers.
Install the title plate guide boot onto the title plate.
Install the title plate.
Weight roller
Weight roller
Guide boot
Sliding pulley
Pulley hub
Tilt plate
8-7
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8. V-BELT DRIVING SYSTEM/KICK STARTER ARM SYM
Apply with grease 4~5 g to inside of driving shaft hole, and install driving pulley hub.
Caution
The pulley surface has to be free of grease. Clean it with cleaning solvent.
Install siding pulley assembly onto crankshaft.
DRIVING PULLEY INSTALLATION
Press driving belt into pulley groove, and then press down the up & down sides of the driving belt to separate it away from the driving pulley hub.
Caution
To press down the up & down sides of the driving belt can avoid to pressing and damaging the belt when installing the driving pulley, and also can make sure that the driving pulley can be tighten.
Install driving pulley, washer and nut.
Caution
Make sure that two sides of pulley surfaces have to be free of grease.
Clean it with cleaning solvent.
Hold driving pulley with universal fixture.
Tighten nut to specified torque.
Torque value: 5.0~6.0 kgf-m
Install left crankcase cover.
Sliding pulley
Crankshaft
Press down
Driving belt
Pulley surface
Pulley hub
Universal fixture
8-8
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
CLUTCH/DRIVEN PULLEY
DISASSEMBLY
Remove driving belt and clutch/driven pulley.
Install clutch spring compressor onto the pulley assembly, and operate the compressor to let nut be installed more easily.
Caution
Do not press the compressor too much.
Hold the clutch spring compressor onto bench vise, and then remove mounting nut with special nut wrench.
Release the clutch spring compressor and remove clutch and spring from driven pulley.
Remove socket from driven pulley.
Remove oil seal from driven pulley.
Remove guide pin, guide pin roller, and sliding pulley, and then remove O-ring & oil seal seat from sliding pulley.
INSPECTION
Clutch outer
Measure the inner diameter of clutch outer friction face. Replace the clutch outer if exceed service limit.
Service limit: 125.5 mm
Special nut wrench
Clutch spring compressor
Sliding pulley
O-ring
Inner diameter
Oil seal
Guide pin
Socket
Guide pin
Guide pin roller
Clutch outer
8-9
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8. V-BELT DRIVING SYSTEM/KICK STARTER ARM SYM
Clutch lining
Measure each clutch lining thickness.
Replace it if exceeds service limit.
Service limit: 2.0mm
Driven pulley spring
Measure the length of driven pulley spring.
Replace it if exceeds service limit.
Service limit: 163.7mm
Driven pulley
Check following items;
• If both surfaces are damage or wear.
• If guide pin groove is damage or wear.
Replace damaged or worn components.
Measure the outer diameter of driven surface and the inner diameter of driven pulley.
Replace it if exceeds service limit.
Service limit: Outer diameter 33.94mm
Inner diameter 34.06mm
Driven Pulley Bearing Inspection
Check if the inner bearing oil seal is damage.
Replace it if necessary.
Check if needle bearing is damage or too big clearance. Replace it if necessary.
Rotate the inside of inner bearing with fingers to check if the bearing rotation is in smooth and silent.
Clutch lining
Free length
Driven pulley
Sliding disc
Clutch
Guide pin groove
Needle bearing
Outer ball bearing
8-10
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
Clutch Block Replacement
Remove snap and washer, and the remove clutch block and spring from driving plate.
Check if spring is damage or insufficient elasticity.
Check if shock absorption rubber is damage or deformation. Replace it if necessary.
Apply with grease onto setting pins.
Apply with grease onto setting pins. But, the clutch block should not be greased. If so, replace it.
Install new clutch block onto setting pin and then push to specified location.
Caution
Grease or lubricant will damage the clutch block and effect the block’s connection capacity.
Install the spring snap into groove with pliers.
Spring
Clutch block
Shock absorption rubber
Shock absorption rubber
Clutch block
Spring
Driving plate
Snap ring
Setting pin
8-11
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8. V-BELT DRIVING SYSTEM/KICK STARTER ARM SYM
Install snap ring and mounting plate onto setting pin.
REPLACEMENT OF DRIVEN PULLEY
BEARING
Remove inner bearing.
Caution
If the inner bearing equipped with oil seal on one side in the driven pulley, then remove the oil seal firstly.
If the pulley equipped with ball bearing, it has to remove snap ring and then the bearing.
Remove snap ring and then push bearing forward to other side of inner bearing.
Place new bearing onto proper position and its sealing end should be forwarded to outside.
Apply with specified grease.
Recommended to use the KING MATE G-3.
Install the snap ring and hold the bearing.
Install a new inner bearing.
Caution
Its sealing end should be forwarded to outside as bearing installation.
Install needle bearing with hydraulic presser. Install ball bearing by means of hydraulic presser.
Align oil seal lip with bearing, and then install the new oil seal (if necessary).
Outer bearing
Snap ring
Snap ring
Inner needle bearing
Specified grease
Outer bearing
Sealing end
Inner bearing
Oil seal
Snap ring
Sealing end
8-12
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SYM 8. V-BELT DRIVING SYSTEM/KICK STARTER ARM
INSTALLATION OF CLUTCH/DRIVEN
Oil seal
PULLEY ASSEMBLY
Install new oil seal and O-ring onto sliding pulley. Apply with specified grease to lubricate the inside of sliding pulley.
O-ring
Specified grease
Install sliding pulley onto driven pulley.
Install guide pin and guide pin roller.
Install oil socket.
Install driving belt, spring and clutch into clutch spring compressor, and press down the assembly by turning manual lever until mounting nut that can be installed.
Hold the compressor by bench vise and tighten the mounting nut to specified torque with special nut wrench.
Remove the clutch spring compressor.
Torque value: 5.0~6.0 kg-m
Install clutch/driven pulley and driving belt onto driving shaft.
Sliding pulley
O-ring
Oil socket
Oil seal
Guide pin
Special nut wrench
Clutch spring compressor
Guide pin
Guide pin roller
8-13
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SYM 9. FINAL DRIVING MECHANISM
MECHANISM DIAGRAM ....................9-1
OPERATIONAL PRECAUTIONS .......9-2
TROUBLE DIAGNOSIS ......................9-2
INSPECTION OF FINAL DRIVING MECHANISM
..
9-3
BEARING REPLACEMENT................ 9-4
RE-ASSEMBLY OF FINAL DRIVING MECHANISM
.........9-6
DISASSEMBLY OF FINAL DRIVING MECHANISM
.........9-3
MECHANISM DIAGRAM
countershaft gear driving gear countershaft final driving shaft final driving gear
1.8~2.2 kgf-m
1.0~1.4 kgf-m
3.5~4.5 kgf-m
9-1
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9. FINAL DRIVING MECHANISM SYM
OPERATIONAL PRECAUTIONS
Specification
Application gear oil: 4-stroke lubricant
Recommended oil: KING MATE serial gear oils
Oil quantity: 110 c.c. (90~100 c.c. when replacing)
Tools
Special service tools
Inner type bearing puller
Outer type bearing puller
Gear box oil seal installer
Gear box bearing installer
TROUBLE DIAGNOSIS
Engine can be started but motorcycle can not be moved
• Damaged driving gear
• Burnt out driving gear
• Broken driving belt
Noise
• Worn or burnt gear
• Worn gear
Torque value
Gear box cover bolts 1.8~2.2 kgf-m
Gear oil drain plug bolt 3.5~4.5 kgf-m
Gear oil filling bolt 1.0~1.4 kgf-m
Gear oil leaks
• Excessive gear oil
• Worn or damage oil seal
9-2
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SYM 9. FINAL DRIVING MECHANISM
DISASSEMBLY OF FINAL DRIVING
MECHANISM
Remove the rear wheel. (refer to chapter 15)
Remove the clutch.
Drain gear oil out from gear box.
Remove gear box cover bolts (7 bolts) and then remove the cover and the final driving shaft.
Remove gasket and setting pin.
Remove countershaft and gear.
Remove final driving gear and shaft.
INSPECTION OF FINAL DRIVING
MECHANISM
Check if the countershaft and the gear are wear or damage.
Check if the final driving shaft and gear are burn, wear or damage.
7 bolts countershaft gear final driving shaft final driving gear driving shaft countershaft
9-3
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9. FINAL DRIVING MECHANISM SYM
Check bearings on gear box and cover.
Rotate each bearing’s inner ring with fingers.
Check if bearings can be turned in smooth and silent, and also check if bearing outer ring is mounted on gear box & cover tightly.
If bearing rotation is uneven, noising, or loose bearing mounted, then replace it.
Check oil seal for wear or damage, and replace it if necessary.
Caution
Do not remove the driving shaft from the cover top side.
If remove the driving shaft from the cover top side, then its bearing has to be replaced.
Check driving shaft and gear for wear or damage.
BEARING REPLACEMENT
Caution
Never install used bearings. Once bearing removed, it has to be replaced with new one.
Remove driving shaft bearing from left crankcase using following tools;
Inner type bearing puller
Install new driving shaft bearing into left crankcase.
Tool:
Press the bearing into cover with C type hydraulic presser or bearing installer. countershaft gear final driving shaft final driving gear driving shaft countershaft
9-4
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SYM 9. FINAL DRIVING MECHANISM
Press out the driving shaft from the gear box.
Remove oil seal from the gear box.
Remove the driving shaft bearing from the gear box cover with the inner type bearing puller.
Caution
Using the bearing protector as pressing out the driving shaft from the gear box cover.
Specified tool:
Inner type bearing puller.
If the driving shaft is pulled out with its bearing, then remove the bearing with bearing puller and bearing protector.
Tool:
Multi-functional bearing puller
Bearing protector
Install a new driving shaft bearing onto gear box cover.
Then, install the driving shaft.
Specified tool:
Press the bearing in with C type hydraulic presser or bearing installer.
Install a new final driving shaft bearing onto gear box cover.
Specified tool:
Press the bearing in with C type hydraulic presser or the bearing installer.
Apply with some grease onto the lip section of oil seal and then install the seal.
Driving shaft
Bearing protector
Multi-functional bearing puller driving shaft
9-5
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9. FINAL DRIVING MECHANISM SYM
RE-ASSEMBLY OF FINAL DRIVING
MECHANISM
Install final driving shaft and final driving gear, countershaft, and countershaft gear.
Install the setting pins(2 pins) and new gasket.
Apply with grease onto the oil seal lip of final driving shaft.
Install the gear box cover and 7 bolts.
(tighten the bolts)
Torque: 1.8~2.2 kgf-m
Install the clutch/sliding driving pulley.
Install the driving pulley, belt and left crankshaft cover.
Install the rear wheel.
Add gear oil.
Recommended usage: SYM HYPOID
GEAR OIL (SAE 85W-140)
(110 cc: standard capacity)
(100 cc: when replacement) final driving shaft countershaft final shaft gear dowel pins
9-6
7 bolts http://www.motorcycle.in.th
SYM 10. A.C. GENERATOR/STARTING CLUTCH
MECHANISM DIAGRAM ....................10-1
PRECAUTIONS IN OPERATION .......10-2
A.C.GENERATOR REMOVAL............10-3
RIGHT CRANKCASE COVER REMOVAL
. 10-4
MECHANISM DIAGRAM
0.8~1.2kgf-m
5.0~6.0kgf-m
1.0~2.0kgf-m
STARTING CLUTCH.......................... 10-5
RIGHT CRANKCASE COVER INSTALLATION
... 10-8
MOUNTED COIL SET INSTALLATION
........ 10-8
FLY WHEEL INSTALLATION............. 10-8
9.0~10.0kgf-m
1.0~1.4kgf-m
10-1
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10. A.C. GENERATOR/STARTING CLUTCH SYM
PRECAUTIONS IN OPERATION
General information
Refer to chapter 5: Engine removal and installation
Refer to chapter 1: The troubleshooting and inspection of A.C. generator
Refer to chapter 16: The service procedures and precaution items of starter motor
Specification Unit: mm
ID of starting driven gear
OD of starting clutch cover
Torque value:
Flywheel nut
Exhaust muffler bolt 8 mm
Oil screen cover
Starting clutch hex lock nut
Starting clutch hex socket bolt
Special service tools
Flywheel puller
Universal fixture
32.060
27.940
5.0~6.0kgf-m
3.0~3.6kgf-m
1.0~2.0kgf-m
9.0~10.0kgf-m with oil on the thread
1.0~1.4kgf-m with adhesive
10-2
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SYM 10. A.C. GENERATOR/STARTING CLUTCH
A.C. GENERATOR REMOVAL
Pulse generator
Drain out the engine oil.
Coil
Remove the exhaust muffler. (2 bolts, 2 nuts)
Remove the fan shroud. (4 bolts)
Remove the fan. (4 bolts)
Hold the flywheel with the universal fixture.
Remove the 10mm nut on the flywheel.
Special Service Tools:
Universal Fixture
Flywheel
Cooling fan
Cable guide
Cooling fan shroud
Exhaust muffler
Cooling fan shroud
Cooling fan
Universal fixture
10-3
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10. A.C. GENERATOR/STARTING CLUTCH SYM
Remove the flywheel with the flywheel puller.
Special service tools:
Flywheel puller
Shaft protector
Caution
Install a shaft protector on the right end of crankshaft to avoid damaging the crankshaft before installing the flywheel puller.
Flywheel puller
Pulse generator connector
Remove the connectors of the A.C. generator and pulse generator.
Remove the 6 bolts for the pulse generator, the A.C. generator coil and cable guide.
Then, remove the A.C. generator assembly.
Caution
Do not damage the alternator coil.
RIGHT CRANKCASE COVER
REMOVAL
Remove the right crankcase cover. (6 bolts)
Remove setting pin and gasket.
Remove the gasket or foreign materials on the connection surfaces of both the cover and crankcase.
Caution
Do not damage the connection surfaces. generator connector
Pulse generator
Coil
Cable guide
6 bolts
10-4
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SYM 10. A.C. GENERATOR/STARTING CLUTCH
STARTING CLUTCH
Starting Clutch Removal
Hold the starting driven gear with the universal fixture.
Remove the 22mm anti-loosen lock nut and gasket.
Special service tools:
Anti-loosen lock nut socket
Universal fixture.
Caution
The mounting nut is left-turn thread.
Remove the starting driven gear.
Remove starting clutch, starting reduction gear, and shaft.
Starting Clutch Inspection
Install the starting clutch onto the starting driven gear.
Hold the starting clutch and turn the starting driven gear.
The starting driven gear should can be turned in the motion of C.W. and can not be turned in C.C.W.
Lock nut
Starting driven gear
Starting reduction gear
Lock nut socket
Starting clutch
Starting driven gear
10-5
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10. A.C. GENERATOR/STARTING CLUTCH SYM
Check the starting driven gear for wear or damage.
Measure the ID of the starting driven gear.
Service Limit:
ID: 32.06 mm or less
Check the starting reduction gear and shaft for wear or damage.
Measure the ID of the starting reduction gear.
Service Limit:
ID: 10.05 mm or less
Measure the OD of the starting reduction gear.
Service Limit:
ID: 9.94 mm or above
Disassembly
Remove the hex blots (3 bolts) inside the starting clutch.
Separate the clutch body and the clutch cover.
Remove the rollers, plugs, and springs on the one way clutch.
Check each rollers and plugs for wear or damage.
Install rollers, plugs and springs.
Measure the OD of the starting clutch cover.
Service Limit:
ID: 27.94 mm or above
Starting driven gear
Hex blots
Clutch cover
Starting reduction gear
Plug Spring
Roller
10-6
Starting clutch cover
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SYM 10. A.C. GENERATOR/STARTING CLUTCH
Installation
Install the components in the reverse procedures of removal.
Hex socket bolt
Plug
Spring
Caution
Add adhesive onto the thread of hex socket bolt.
Torque value: 1.0~1.4kgf-m
Starting clutch Installation
Install reduction gear shaft and reduction gear.
Install starting clutch.
Install the starting driven gear onto the starting clutch.
Hold the starting driven gear with the universal fixture.
Tighten the 22mm anti-loosen lock nut and gasket.
Clutch body
Starting clutch
Clutch cover
Starting driven gear
Lock nut
Caution
Add engine oil onto the thread of lock nut.
Special service tools:
Anti-loosen lock nut socket
Universal fixture
Torque value: 9.0~10.0kgf-m
Roller
Oil pump cover
Lock nut socket
10-7
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10. A.C. GENERATOR/STARTING CLUTCH SYM
RIGHT CRANKCASE COVER
INSTALLATION
Install setting pin and new gasket on the crankcase.
Replace the right crankshaft oil seal of the crankcase and apply some oil onto the oil seal lip.
Install right crankcase cover onto the right crankcase. (6 bolts)
Torque value: 0.8~1.2kgf-m
MOUNTED COIL SET
INSTALLATION
Install the coil set onto right crankcase cover. (2 bolts)
Install pulse generator. (2 bolts)
Tighten the cable guide. (2 bolts)
Torque: 0.8~1.2kgf-m
Tie the wire harness hose onto the indent of crankcase.
Caution
Make sure that the wire harness is placed under the pulse generator.
Install A.C. generator connector and pulse generator connector.
FLYWHEEL INSTALLATION
Make sure that there is no magnetic powder.
If so, clean up it.
Align insert on crankshaft with the flywheel groove, and then install the flywheel.
Hold the flywheel with flywheel holder, and tighten its nut.
Torque value: 5.0~6.0kgf-m
Special service tool:
Universal fixture
Pulse generator
Coil
generator connector
6 bolts
Cable guide
Pulse generator connector
Universal fixture
10-8
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SYM 10. A.C. GENERATOR/STARTING CLUTCH
Install the cooling fan. (4 bolts)
Cooling fan
Install the cooling fan shroud. (4 bolts)
Install the exhaust muffler. (2 bolts, 2 nuts)
Add some engine oil according the specified quantity.
Cooling fan shroud
Exhaust muffler
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10-9
SYM 11. CRANKCASE/CRANKSHAFT
MECHANISM DIAGRAM
.............. 11-1
OPERATIONAL PRECAUTIONS
... 11-2
TROUBLE DIAGNOSIS
................ 11-2
MECHANISM DIAGRAM
0.8~1.2 kgf-m
DISASSEMBLY OF CRANKCASE
11-3
CRANKSHAFT INSPECTION
....... 11-5
ASSEMBLY OF CRANKCASE
..... 11-6
0.7~1.0 kgf-m
11-1
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11. CRANKCASE/CRANKSHAFT SYM
OPERATIONAL PRECAUTIONS
General Information
This Section contains descriptions concerning disassembly of the crankcase so that the crankshaft can be serviced.
Complete following operations before disassembling crankcase.
Cylinder head
Cylinder and piston
V-belt Drive pulley
AC generator/ Starting Clutch
Chapter 6
Chapter 7
Chapter 8
Chapter 10
Start motor Chapter 16
If the crankshaft bearing or timing sprocket need be replaced, then the crankshaft set have to replaced.
Left, right clearance of the big end of the connecting rod 0.100~0.350 0.550
Radial clearance of the big end of the connecting rod 0.000~0.008 0.050
─
Below 0.030 Run-out
Torque value
Bolts for crankcase
Cylinder/cylinder head two ends bolts
Engine oil draining plug bolt
Pivot for cam chain tensioner
Special Service Tools
Crankcase remover/set
Crankshaft installation puller
Inner type bearing puller
Outer type bearing puller
Bearing pressing tools
Oil seal pressing tools
TROUBLE DIAGNOSIS
Engine noise
• Loose crankshaft bearing
• Loose crankshaft pin bearing
• Wear piston pin or piston pin hole
1.5~2.0 kgf-m
0.8~1.2 kgf-m
3.5~4.5 kgf-m
0.8~1.2 kgf-m(Hex socket bolt)
11-2
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SYM 11. CRANKCASE/CRANKSHAFT
DISASSEMBLY OF CRANKCASE
Remove the 2 bolts from the right side of crankcase.
Remove the cam chain tensioner (hex socket bolt) from the left side of crankcase.
Place the left side of crankcase upward, and then install the crankcase remover/set onto the crankcase.
Drive the screw of the crankcase remover/set into the crankcase, and then separate the left and the right crankcases.
Remove the cam chain.
2 bolts
1 hex socket bolt
Caution
Never pry out the connection surfaces of crankcases as separating.
Otherwise, the connection surfaces could be damaged and cause oil leaking.
It have to separate the cam chain and the drive gear before pressing out the both left and right crankcases.
Special Service Tools:
Crankcase remover/set
11-3
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11. CRANKCASE/CRANKSHAFT SYM
Remove the crankshaft from the right crankcase.
Caution
The left and right bearings of crankshaft is to press-fit onto the crankshaft.
Remove gasket and dowel pins (2).
Scrape gasket residues off the crankcase contact surface.
Caution
Do not damage contact surface of the crankcase.
Soap the gasket residues into solvent and the residues will be removed easily.
Remove oil seal from the left crankcase.
11-4
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SYM 11. CRANKCASE/CRANKSHAFT
CRANKSHAFT INSPECTION
Measure left and right clearance of connecting rod big end.
Service limit: Replace when it is more
than 0.55 mm
Measure the radical clearance of the big end at the vertical directions.
Service limit : 0.05 mm
Place the crankshaft onto a V-block and measure run-out of the crankshaft with dial gauge.
Service limit: 0.10 mm
Bearing Inspection
Rotate the bearing with fingers and make sure the bearing can be rotated smoothly and quietly.
Check if the inner ring is connected onto the crankshaft tightly.
Replace crankshaft as a set when noise or looseness is detected.
60 mm clearance
90 mm clearance
11-5
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11. CRANKCASE/CRANKSHAFT SYM
ASSEMBLY OF CRANKCASE
Install cam chain into the chain hole of the left crankcase, and then split out the cam chain.
Caution
Do not damage the cam chain as installing the crankshaft.
Install crankshaft into the left crankcase and then install two dowel pins and new crankcase gasket.
Install the right crankcase and tighten the crankcase bolts (2 bolts).
Torque value: 0.8~1.2 kgf-m
Install the cam chain tensioner.
Install a new O-ring onto the mounting bolt of the chain tensioner.
Apply some oil on the O-ring and tighten the bolt.
Torque value: 0.8~1.2 kgf-m
Caution
The O-ring must be installed into the bolt’s groove.
2 bolts hex socket bolt dowel pins
11-6
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SYM 11. CRANKCASE/CRANKSHAFT
Apply with some grease onto the oil seal lip and then install it onto the left crankcase.
Press-fit the oil seal to specified position with the oil seal installer (25x37x6).
Special service tools: the oil seal installer (25x37x6)
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11-7
SYM 12. BODY COVER
MAINTENANCE INFORMATION........12-2
HANDLE COVER ...............................12-3
FRONT COVER..................................12-4
UNDER COVER .................................12-5
FRONT INNER BOX........................... 12-6
BODY COVER/REAR FENDER ......... 12-7
FRONT CENTER COVER.................. 12-9
LUGGAGE BOX ................................. 12-9
FLOOR PANEL .................................. 12-9
Rear carrier
Double Seat
Front handle cover
Front cover
Inner box
Front fender
Rear handle cover
Frame number cover
Floor panel
Luggage box
Battery cover
Right body cover
Front center cover
Fuel tank
Left body cover
Under cover
Rear inner fender
RR. mudguard
Rear fender
Left side cover
Front spoiler
Right side cover
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12-1
12. BODY COVER SYM
MAINTENANCE INFORMATION
Body covers disassemble sequence:
Front handle cover
Rear handle cover
Front cushion
Front fender
Front cover
Inner box
Front spoiler
Left/right side cover
Battery cover
Floor panel
Luggage box & Seat
Front center cover Rear carrier
Left/right body cover
Rear fender
Rear inner fender
Under cover
Be careful not to damage various covers in disassembly or re-assembly operation.
Never injure hooks molded on the body covers in disassembly or re-assembly operation.
Align the buckles on the guards with slot on the covers.
Make sure that each hook is properly installed during the assembly.
Never compact forcefully or hammer the guard and the covers during assembly.
12-2
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SYM 12. BODY COVER
HANDLE COVER
Removal:
Remove the left/right back mirror.
Remove 2 lower mounting screws between the front handle cover and the rear handle cover.
Remove the mounting screws (4 screws) between the front handle cover and the rear handle cover.
Remove the headlight connector.
Remove the front handle cover.
Remove the front handle cover.
Installation
Install according to the reverse procedure of removal. mounting screw ×2
Screws
2×2
Headlight connector
12-3
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12. BODY COVER SYM
Remove the mounting screws (2 screws) between the rear handle cover and the frame.
Remove the speedometer cable.
Remove the mounting screws (4 screws) between the rear handle cover and meter.
Remove the left/right handle switch connectors.
Remove the rear handle cover.
Installation:
Install according to the reverse procedure of removal.
right
screws×2
screws×4
left speedometer cable
FRONT COVER
Removal
Remove the 1 mounting bolt of front cover from the frame.
Remove the mounting screws (3×2 screws) between the front cover and inner box.
bolt×1
12-4
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6 screws
SYM 12. BODY COVER
Remove the front turn left/right signal light wire connectors.
Remove the front cover.
Installation:
Install according to the reverse procedure of removal.
UNDER COVER
Removal
Remove the 1×2 mounting screws between the left/right side cover and the floor panel.
Remove the 1×2 mounting screws between the left/right side cover and the frame.
Remove the 2×2 mounting bolts between the under cover and the frame.
Remove the under cover.
Installation:
Install according to the reverse procedure of removal. wire connectors
1×2 screws
1×2 screws
2×2 bolts
12-5
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12. BODY COVER SYM
FRONT INNER BOX
Removal
Remove the front cover.
Remove the 6 mounting screws of front cover from the inner box.
Remove the 1×2 mounting screws of front spoiler from the inner box.
Remove the 1×2 mounting screws of front spoiler from the inner box.
Remove the screw on the front inner box.
6 screws
2 screws
2 screws front spoiler
1 screw
12-6
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SYM 12. BODY COVER
Remove the screw on the main switch.
Remove the main switch cover.
Remove the front inner box A.
Installation
Install the inner box A and the front inner box
B according to the reverse procedure of removal.
1 screw
6 bolts
BODY COVER/REAR FENDER
Removal
Open the seat.
Remove the luggage box. (6 bolts)
Remove the rear carrier. (3 bolts)
Remove the 1×2 mounting screws between the body cover and frame.
3 bolts
2 screws
12-7
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12. BODY COVER SYM
Remove the 2×2 mounting screws between the body cover and the rear fender.
Remove the 1×2 mounting screws between the body cover and the floor panel.
Remove the 1 mounting screw between the body cover and front center cover.
Remove the 2 mounting bolts of the rear fender.
Remove the left/right body cover.
Remove the rear fender.
Installation
Install the body cover and rear fender according to the reverse procedure of removal.
2×2 screws
1 screw
2 bolts
1×2 screws
12-8
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SYM 12. BODY COVER
FRONT CENTER COVER
Removal
Remove the 1 mounting screw between the body cover and the front center cover.
Remove the 4 screws from the battery cover.
Remove the the battery cover.
Remove the front center cover.
Installation
Install the cover according to the reverse procedure of removal.
LUGGAGE BOX
Removal
Open the seat.
Remove the 6 bolts from the luggage box.
Remove the luggage box and the double seat.
Remove the engine start control switch wire connectors.
Installation
Install the luggage box according to the reverse procedure of removal.
FLOOR PANEL
Removal
Remove the 4 bolts from the floor panel.
1 screw
4 screws
6 bolts
4 bolts
12-9
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12. BODY COVER SYM
Remove the 4 screws from the battery cover.
Remove the battery cover.
Remove the front center cover mounting screw.
Remove the 1×2 screws between the body cover and the floor panel.
Remove the 1×2 screws between the left/right side cover and the floor panel.
Remove the floor panel.
Installation
Install the floor panel according to the reverse procedure of removal.
1×2 screws
4 screws
1 screw
1×2 screws
12-10
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SYM 13. BRAKE
MECHANISM DIAGRAM-FRONT DISC BRAKE SYSTEM.....
13-1
MECHANISM DIAGRAM-FRONT DRUM BRAKE SYSTEM
. 13-2
MECHANISM DIAGRAM-REAR DRUM BRAKE SYSTEM
.. 13-3
MAINTENANCE INFORMATION ....... 13-4
TROUBLE DIAGNOSIS ..................... 13-5
HYDRAULIC BRAKE SYSTEM INSPECTION
..... 13-6
BRAKE FLUID REPLACEMENT/AIR-BLEED
..... 13-7
MECHANISM DIAGRAM
BRAKE CALIPER .............................. 13-8
BRAKE DISC ..................................... 13-9
BRAKE MASTER CYLINDER ........... 13-9
DRUM BRAKE-DRUM ....................... 13-12
BRAKE LING ..................................... 13-12
BRAKE PANEL.................................. 13-13
Front Disc Brake System
2.8~3.2 kgf-m
0.8~1.0 kgf-m
3.3~3.7 kgf-m
4.0~4.5 kgf-m
11.0~13.0 kgf-m
13-1
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13. BRAKE SYM
MECHANISM DIAGRAM
Front Drum Brake System
2.8~3.2 kgf-m
0.8~1.2 kgf-m
11.0~13.0 kgf-m
13-2
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SYM 13. BRAKE
MECHANISM DIAGRAM
Rear Drum Brake System
0.8~1.2 kgf-m
0.8~1.2 kgf-m
13-3
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13. BRAKE SYM
MAINTENANCE INFORMATION
Precautions in Operation
Caution
Installing lining dusts may cause disorders of respiration system or cancer, therefore, never use air hose or dry brush to clean brake parts. Use vacuum cleaner or other authorized tool instead.
The brake caliper can be removed without removing the hydraulic system.
After the hydraulic system is removed, or the brake system is felt to be too soft, bleed the hydraulic system.
While refilling brake fluid, care should be taken not to let the foreign material entering into the brake system.
Do not spill brake fluid on the painted surfaces, plastic or rubber parts to avoid damage.
Check the operation of the brake system before you go.
Item Standard Limit
The thickness of front brake
3.50 2.00
Front brake disc eccentricity
Master cylinder inner diameter
0.15 0.30
25.40
─
ID of front & rear brake drums
OD of front brake disc
Thickness of front disc brake
Thickness of front drum brake
130.00 131.00
─
130.00
─
As brake ling mark
─
2mm or As brake ling mark
─
2mm or As brake ling mark Thickness of rear brake lining
Torque values
Bolt for front brake arm
Bolt for rear brake arm
Brake hose bolt
Bolt for brake caliper
Air-bleed valve
0.8~1.2kgf-m
0.8~1.2kgf-m
3.3~3.7kgf-m
3.1~3.5kgf-m
0.8~1.0kgf-m
13-4
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SYM 13. BRAKE
TROUBLE DIOGNOSIS
DISC BRAKE
Soft brake lever
1. Air inside the hydraulic system
2. Hydraulic system leaking
3. Worn master piston
4. Worn brake pad
5. Poor brake caliper
6. Worn brake lining/disc
7. Low brake fluid
8. Blocked brake pipe
9. Warp/bent brake disc
10. Bent brake lever
Uneven brake
1. Dirty brake lining/disc
2. Poor wheel alignment
3. Clogged brake hose
4. Deformed or warped brake disc
5. Restricted brake hose and fittings
Tight brake
1. Dirty brake lining/disc
2. Poor wheel alignment
3. Deformed or warped brake disc
Hard operation of brake lever
1. Blocked brake system
2. Poor brake caliper
3. Blocked brake pipe
4. Seized/worn master cylinder piston
5. Bent brake lever
Brake noise
2. Deformed brake disc
3. Poor brake caliper installation
4. Imbalance brake disc or wheel
DRUM BRAKE
Poor brake performance
1. Improper brake adjustment
2. Worn brake lining
3. Worn brake drum
4. Worn brake cam
5. Improper brake lining installation
6. Seized brake cable
7. Dirty brake lining
8. Dirty brake drum
9. Brake pad worn in brake cam area.
10. Poor contact between brake arm and camshaft indent
Tight operation or low return speed of brake lever
1. Worn/broken/crack return spring
3. Dirty brake lining
4. Brake seized caused from dirty brake drum
5. Seized brake cable
6. Worn brake cam
7. Improper brake lining installation
Brake noise
1. Worn brake lining
3. Dirty brake lining
4. Dirty brake drum
13-5
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13. BRAKE SYM
HYDRAULIC BRAKE SYSTEM
INSPECTION
Inspection
Visual inspect for brake fluid leaking or damage. Check if brake hose connection loosen with wrench and turn the handlebar from right to left motion or press down the shock absorber to check if there is something is interfered with the brake system or brake components.
Hose connection
Operate the brake system and check the brake lining. Check the front brake from front side, and replace the brake lining with new one when the brake lining wear limitation groove reaches to the brake disc.
Park the motorcycle on a flat ground and check its brake fluid level.
Recommended brake fluid: WELLRUN DOT 3 brake fluid
CAUTION
The fluid level will not be correct if parking the motorcycle in title or just parking. It has to waiting for around 3~5 minutes.
Never use faked brake fluid to prevent from chemical reaction.
It has to apply with same brand brake fluid to sure the brake performance.
Brake Fluid Add
Turn the handlebar to let the master cylinder in horizontal position before removed the master cylinder cap.
Place a rag onto painting, plastic or rubber components when conduct brake system maintenance.
CAUTION
Do not over the upper level when adding brake fluid and avoid to spilling brake fluid on painted surfaces, plastic or rubber components to result in their damages.
Brake disc brake lining wear limitation groove brake caliper lower level master cylinder cap
Lower level
13-6
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SYM 13. BRAKE
Remove the master cylinder cap and diaphragm.
master
Add good quality brake fluid and it has to add cylinder same brand brake fluid into the master cylinder.
Clean dirty brake disc. diaphragm
CAUTION
The dirty brake lining or disc will reduce the brake performance. The mixed non-compatible brake fluid will reduce brake performance. Foreign materials will block the system causing brake performance to be reduced or totally lost.
BRAKE FLUID REPLACEMENT/
AIR-BLEED
Connect drain hose to drain valve.
Open the drain valve on the caliper and hold and release the brake lever alternatively until the old brake fluid is entirely drained out.
Close the drain valve and add specified brake fluid into the brake master cylinder.
CAUTION
To reuse the spent brake fluid will effect brake performance.
Connect one end of transparent hose to the drain valve, and put the other end into a container.
Open the drain valve around 1/4 turns, and at the same time hold the brake lever until the there is no air bubble in the drain hose and also feeling resistance on the brake lever.
Close the drain valve when finishing the brake system refilling fluid procedure, and operate the brake lever to check whether air bubble is in brake system or not. If brake is still soft, please bleed the system as described below.
1. Tightly hold the brake lever and open the drain valve around 1/4 turns, and then close the valve.
CAUTION
Do not release the brake lever before the drain valve is closed.
Always check the brake fluid level when carrying out the air bleeding procedure to avoid air entering into the system.
2. Slowly release the brake lever, and wait for a few seconds until it reaches its top position.
3. Repeat the steps 1 and 2 until there is no air bubble at the end of the hose. Tightly close the drain valve.
4. Make sure the brake fluid is in the UPPER level of the master cylinder, and refill the fluid if necessary.
5. Cover the cap.
drain valve bubble drain valve transparent draining hose
13-7
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13. BRAKE SYM
BRAKE CALIPER
Removal
Place a container under the brake caliper, and loosen the brake hose bolt and finally remove the brake hoses. bolts x 2 hose bolt
CAUTION
Do not spill brake fluid on painted surfaces.
Remove two caliper bolts and the caliper.
Make sure the brake lining condition. Replace the lining if the brake lining wear limitation groove close to the brake disc.
Brake Lining Replacement
Compress the caliper and let the brake lining out of the caliper mounting plate. Compress the brake lining locking spring. Remove the inner brake lining firstly and then remove the outer brake lining.
Compress the brake caliper at first as installation. Install the inner brake lining firstly, and then install the outer brake lining.
INSTALLATION
Install the brake caliper and tighten the attaching bolts securely.
Torque: 3.3 kgf-m
CAUTION
Use M8 x 35 mm flange bolt only.
Long bolt will impair the operation of brake disc.
Tighten the lining guide bolt.
Torque: 1.8 kgf-m
Use two seal washers and hose bolts to lock the hose and brake caliper in place.
Torque: 3.5 kgf-m
brake lining locking spring brake lining brake lining wear limitation groove brake mounting plate piston locking spring brake caliper
Refill up the brake fluid to the reservoir and make necessary air bleeding.
13-8
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SYM 13. BRAKE
BRAKE DISC
Inspection
Visually check the brake disc for wear or break.
Measure the thickness of the disc at several places. Replace the disc if it has exceeded the service limit.
Allowable limit: 2.0 mm
Remove the brake disc from wheel.
Check the disc for deformation and bend.
Allowable limit: 0.30 mm
CAUTION
Do not let grease touch to the brake disc that will cause brake performance.
Do not clean the brake lining with air gun.
Operator should wear mask & glove and use vacuum cleaner to clean the brake lining.
BRAKE MASTER CYLINDER
Removal brake disc micrometer brake hose
CAUTION
Do not let foreign materials enter into the cylinder.
CAUTION
The whole set of master cylinder, piston, spring, diaphragm and circlip should be replaced after removal.
Remove the front and rear handlebar guards.
Remove the leads of brake lamp switch.
Drain out the brake fluid.
Remove the brake lever from the brake master cylinder.
Remove the brake hose.
Remove the master cylinder seat and the master cylinder.
Remove the rubber pad.
Remove the circlip.
Remove the piston and the spring.
Clean the master cylinder with recommended brake fluid. rubber boot circlip rubber washer piston spring bolts x2 brake lamp switch master cylinder
13-9
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13. BRAKE SYM
Inspection
Check the master cylinder for damage or scratch. Replace it if necessary.
Measure the cylinder inner diameter at several points along both X and Y directions.
Replace the cylinder if the measured values exceed allowable limit.
Allowable limit: 11.055 mm
master cylinder
Dial gauge
Measure the outer diameter of the piston.
Replace the piston if its measured value exceeds allowable limit.
Allowable limit: 10.945 mm
Assembly
Piston
Micrometer circlip
CAUTION
It is necessary to replace the whole set comprising piston, spring, piston cup, and circlip.
Make sure there is no dust on all components before assembling.
Apply clean brake fluid to the piston cup, and then install the cup onto the piston.
Install the larger end of the spring onto the master cylinder.
The master cup’s cavity should be face inside of master cylinder when installing the master cup.
Install the circlip. rubber boot rubber washer piston spring brake lamp switch master cylinder
CAUTION
Never install cup lip in the opposite direction.
Make sure the circlip is seated securely in the groove.
Install the rubber pad into groove properly.
13-10
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SYM 13. BRAKE
INSTALLATION
Place the master cylinder onto handlebar, and install the split ring and bolts. The
“UP” mark on the split ring should face upward.
Align the split ring on the master cylinder seat with the alignment point on the handlebar.
Tighten the upper bolt of the seat to specified torque value, and then tighten lower bolt to the same specified torque value. brake hose split ring master cylinder
“UP” mark mounting seat bolts x 2
Install the brake lever, and connect leads to brake lamp switch.
Connect brake hoses with 2 new washes.
Tighten the brake hose bolt to the specified torque value.
Torque value: 3.5 kgf-m
Make sure the hose is installed correctly. sealing washer hose bolt
CAUTION
Improper routing may damage leads, hoses or pipes.
CAUTION
Kink of brake leads, hose or pipe may reduce brake performance.
Add specified brake fluid and bleed the system and conduct the air-bleeding job for the system. brake hose
13-11
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13. BRAKE SYM
DRUM BRAKE-DRUM
Brake Drum
Removal
Use a vacuum cleaner and other suitable tools to clean the brake parts to minimize the hazard caused by the dust.
Caution
•Inhaling dust may cause respiration system disorder even cancer. Never use an air hose or a dry brush as to clean the brake parts.
•Grease on brake lining will reduce braking efficiency.
Remove wheel. Remove brake drum from wheel hub.
Inspection
Check the brake drum for wear and damage, replace wheel hub if necessary
Measure the ID of hub at several points and record the largest value.
Service limit : 131.0 mm
Caution
•Remove the rust by using #120 sand paper.
•An inside micrometer must be used when measuring ID of brake drum because the brake drum has a friction back plate.
BRAKE LINING
Inspection
Measure the thickness of the brake lining at three points (both ends and center).
If the thickness is less than specified, or if it is contaminated by oil or grease, replace as a set.
Service limit : Front 2.0 mm
Rear 2.0mm
Front brake drum
Rear brake drum
Front
Brake lining
Brake lining
13-12
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SYM 13. BRAKE
Removal
Caution
Brake linings must be replaced as a set.
Remove brake shoes from the brake panel by pulling out the brake linings with two hands.
Installation
Apply a thin coat of grease to the brake cam and the anchor pin.
Hook the brake spring onto the brake cam.
Pull out the brake linings and install them onto the brake panel. Wipe off the excessive grease from the brake cam and the anchor pin after installation.
Slightly grind the brake lining surfaces with sand-paper to clean the surfaces. front brake cam
後 rear anchor pin
Caution
Braking efficiency will be reduced if brake lining is contaminated by oil or grease.
BRAKE PANEL
Removal
Remove the brake arm bolt and then remove the brake arm, wear indicator, brake return spring and brake cam as well as the oil seal from the brake panel. brake spring
Front brake spring brake shoes brake cam anchor pin brake shoes
Brake cam
Brake arm
Return spring
Wear indicator
Bolt
Rear
Wear indicator
Return spring
13-13
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13. BRAKE SYM
Installation
FRONT BRAKE PANEL
Apply a thin cost of grease onto the brake cam shaft.
Install the brake cam.
Apply a thin cost of grease onto the oil seal lip and then install the oil seal onto the brake cam shaft. Finally, install it on the brake panel.
Align the end-part of the brake return spring with the hole of brake panel.
Align both the inner gear of wear indicator and the mark on the brake arm with the indent gear of brake cam, and then install it.
Tighten the bolts and nuts to specified torque.
Torque: 0.8~1.2 kgf-m
REAR BRAKE PANEL
Apply a thin cost of grease between the oil seals on the brake cam shaft.
Install the brake cam.
Align the mark on the brake arm with the inner gear of the brake cam.
Tighten the bolts and nuts to specified torque.
Hook on the return spring.
Torque: 0.8~1.2 kgf-m
Front
Oil seal
Rear
Brake cam
Return spring
Brake arm
Return spring
Wear indicator
Wear indicator
Brake arm
13-14
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SYM 14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER
MECHANISM DIAGRAM ....................14-1
PRECAUTIONS IN OPERATION .......14-2
TROUBLE DIAGNOSIS......................14-2
STEERING HANDLE .......................... 14-3
MECHANISM DIAGRAM
FRONT WHEEL ................................. 14-4
FRONT SHOCK ABSORBER............. 14-9
FRONT FORK/STEERING COLUMN 14-9
2.4~3.0kgf-m
4.0~5.0kgf-m
1.0~2.0kgf-m
0.2~0.3kgf-m
3.1~3.5kgf-m
11.0~13.0kgf-m
http://www.motorcycle.in.th
5.0~7.0kgf-m
14-1
14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER SYM
PRECAUTIONS IN OPERATION
General Information
Before remove front wheel, use a jack to lift the body until front wheel free of ground, and take care not to rotate body in reverse.
Be careful not to allow oil or grease get on brake drum or linings.
Torque values
Front wheel axle
Steering handlebar nut
Steering column top cone sliding ring
Steering column lock nut
Speedometer cable nut
Front shock absorber: Upper nut
5.0~7.0kgf-m
4.0~5.0kgf-m
0.2~0.3kgf-m
1.0~2.0kgf-m
0.15~0.3kgf-m
2.4~3.0kgf-m
Tools
Special service tools
Steering column wrench
Bearing remover
Inner type bearing remover
Attachment, 32×35 mm
Attachment, 42×47 mm
Steering column nut wrench
Steering column top cone ring nut wrench
TROUBLE DIAGNOSIS
Hard steering stem
Over tightening of steering stem lock nut
Broken steering stem steel ball and cone bearing seat
Insufficient tire pressure
Steering stem off center
Uneven left/right cushion
Bend fork
Bent front wheel/tire offset
Front wheel wobbling
Deformed rim
Front wheel bearing loose
Faulty tire
Wheel axle nut tightened improperly
Soft front suspension
Weak fork springs
Oil leakage of the shock absorber seal
Front suspension noise
Cushion cover friction noise
Cushion bolts loose
14-2
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SYM 14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER
STEERING HANDLE
REMOVAL
Remove handle front & rear covers and the front cover (refer to chapter 12).
Drum Brake
Remove the brake lever bolt & nut and then remove the front brake cable.
Remove acceleration handlebar screw and then remove the handlebar, acceleration cable, and handlebar cover & seat.
Remove the speedometer cable from the speedometer gear on the gear box.
Disc Brake
Remove the 2 bolts of the brake master cylinder, and then take out the master cylinder and the split ring.
Caution
Do not operate the front brake lever to avoid to pressing out the brake lining when removing the master cylinder.
Remove acceleration handlebar screw and then remove the handlebar, acceleration cable, and handlebar cover & seat.
Remove the rear brake lever nut and screw, then take out the rear brake cable.
Remove the brake lever seat bolt, and then remove the seat.
Acceleration handlebar seat screw
Split ring
Screw
Master cylinder
Brake lever screw
Brake lever nut
Seat
Bolts x 2
Brake lever seat bolt
Brake lever nut
Brake lever screw
Brake cable
14-3
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14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER SYM
With a wrench to hold the handlebar bolt and then remove the nut.
Take out the handlebar after removed the bolt.
Installation
Install the handlebar according to the reverse procedure of removal.
Apply with some grease onto the handlebar moving parts when installing the acceleration handlebar seat, acceleration handlebar, and acceleration cable.
FRONT WHEEL
Removal
Disc Brake type
Support body bottom and lift front wheel free of ground.
Remove the bolts, and disconnect speedometer cable from the gear box.
Remove the wheel axle nut and pull out the axle. Then, remove the front wheel.
Caution
Do not operate the front brake lever to avoid to pressing out the brake lining when removing the master cylinder.
Bolt
Speedometer cable
Nut
Wheel axle nut
14-4
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SYM 14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER
Drum brake type
Support body bottom and lift front wheel free of ground.
Remove the bolts, and disconnect speedometer cable.
Remove the wheel axle nut and pull out the axle. Then, remove the front brake panel and the front wheel.
Inspection
Wheel axle
Set the axle in V-blocks and measure the run-out.
Service limit: 0.2 mm.
Wheel Rim
Place the wheel onto a rotated bracket.
Turn the wheel with hand and measure its wobble value with a dial gauge.
Service limit:
Radial : 2.0 mm
Axial : 2.0 mm
Disassembly (Disc type)
Remove 3 hex socket bolts and brake disc.
Brake cable Wheel axle nut
Speedometer cable
Wheel axle
14-5
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14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER SYM
Remove the left axle ring and dust seal.
Remove the dust seal on the right side of speedometer gear.
Remove the bearing with the inner type bearing remover.
Take out the bearing spacer and then remove the other bearing.
Tool:
Inner type bearing remover
Disassembly (Drum Brake)
Remove the right dust seal.
Remove the bearing with the inner type bearing remover.
Take out the bearing spacer and then remove the other bearing.
Tool:
Inner type bearing remover
Bearing Inspection
Turn the inner race of bearing with fingers.
The bearing should be turn smoothly. Also check if the outer collar is tightly connected to the wheel hub.
If the bearing do not turn smoothly, or if they are too loose in the races, or damaged, then, remove and replace the bearings with new ones.
Caution
The bearing must be replaced in pair.
Installation
Install the bearing according to the reverse procedure of removal.
Apply some grease into the bearing seat of the wheel hub.
Install the left bearing onto the seat.
Install the bearing spacer and then install the right bearing onto the seat.
Speedometer gear dust seal
Bearing
Bearing
Dust seal
Wheel side collar
Dust seal
DISC BRAKE
Bearing spacer
Clearance
Bearing
DRUM BRAKE
Bearing spacer
Bearing
Clearance
14-6
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SYM 14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER
Caution
Do not install used bearing and replace the bearing once it has been removed.
Do not the bearing in tile motion when installing.
Tool:
C-type compressor or bearing compressor.
Disc Brake
Apply with some grease inside of the dust bearing.
Install the dust seal and the front wheel side collar.
Apply with some grease on both side of the speedometer gear oil seal, and then install the seal.
Drum Brake
Apply with some grease inside of the dust seal, and then install the seal and the front wheel side collar.
Installation
Drum Brake
Apply with some grease on the speedometer driving gear, and then install washer & driving gear into the brake panel.
This two example will to louse the bearing.
Speedometer gear dust seal
Bearing
Wheel side collar
Dust seal
Bearing
Bearing spacer
Bearing
Dust seal
Wheel side collar
DISC BRAKE
DRUM BRAKE
Bearing spacer
Bearing
14-7
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14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER SYM
Align the flange part on the speedometer gear with the slot of wheel hub, and then install the brake disc (drum brake) or speedometer gear box.
Caution
Contaminated brake lining will reduce brake performance so the brake lining, brake drum and disc must be free of grease.
Place the front wheel between the front shock absorbers.
Drum Brake
Align the brake panel slot with the stopper of the shock absorber.
Disc Brake
Align the flange part on the speedometer gear with the slot of shock absorber stopper.
Disc Brake
Install the front wheel axle from right shock absorber side.
Install the wheel axle nut, and tighten it to specified torque value.
Torque value: 11.0~13.0kgf-m
Connect the speedometer cable to the speedometer gear box.
Drum Brake
Install the front wheel axle from right shock absorber side.
Install the wheel axle nut, and tighten it to specified torque value.
Torque value: 5.0~7.0kgf-m
Connect the speedometer cable and brake cable to the brake panel.
DISC BRAKE DRUM BRAKE
Stopper
Gear box flange part
Wheel axle nut
Brake panel slot
Speedometer cable
Speedometer cable
Brake cable
Wheel axle nut
14-8
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SYM 14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER
FRONT SHOCK ABSORBER
Removal
Remove the front fender, front lower spoiler, front guard, and front wheel as well as front brake components.
Remove the brake fluid hose clipper or cable guide on the left shock absorber. (bolt x 1)
As for disc brake, remove the cable guide on the right shock absorber. (bolt x 1)
Remove the top connection bolt of the right shock absorber. (bolt x 4)
Remove the shock absorber from the front fork.
Installation
Install the shock absorbers according to the reverse procedure of removal.
Align the shock absorber top-edge with the top-end level of the front fork when installing the front shock absorber onto the front fork.
Then, tighten the nut.
Torque value: 2.4~3.0kgf-m
FRONT FORK/STEERING COLUMN
Removal
Firstly, remove the handlebar, front wheel, front brake set, and front shock absorbers.
Remove the steering column nut.
Remove the top cone ring, and then remove the steering column.
Caution
Place the steering column bearing balls into a parts container to avoid to missing or shortage.
Brake fluid hose clipper
DISC BRAKE
Shock absorbers
Steering column nut
Bolts
Cable guide
DRUM BRAKE
Top cone race
14-9
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14. STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER SYM
With a plastic hammer to tap the steering column slightly, and then remove the top ball bearing seat.
Remove the lower-end cone bearing seat on the frame with a punch.
Caution
Do not damage the frame and the steering column.
Installation
Install a new top-cone bearing seat onto the top of steering column.
And then, push the lower-cone bearing seat from bottom until to locking position.
Caution
Do not let the ball bearing in title motion as installation.
Apply with some grease onto the top & bottom bearing balls, and then install the balls into bearing seat.
Press in a new lower cone-race onto the steering column, and lubricate it with grease.
Install the steering column.
Lubricate the top-cone race with grease.
Drive the cone-race into the steering column until contact with the top bearing seat no clearance. Note, return 1/2 turn and then tighten the top cone race to specified torque.
(tighten the race around 1/4~3/8 turn more.)
Torque value: 0.2~0.3kgf-m
Caution
Do not tighten the top cone race too tight to prevent from damage the ball bearing seat when tightening the top cone race.
Install the steering column nut and lock the top cone race. Then, tighten the nut.
Torque value: 1.0~2.0kgf-m
Install the bearing seat according to the reverse procedure of removal.
Caution
Lower all bearing seat
Balls
Lower cone-race
Steering column nut
Top cone-race
Steering column nut
Steering column nut
Top cone-race
Balls
Top ball bearing seat.
Return 1/2 turn
Locking to
1/4~3/8 turn
Check the steering column if it can be turned freely and no clearance in vertical motion.
Top cone-race
14-10
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SYM 15. REAR WHEEL/REAR SHOCK ABSORBER
MECHANISM DIAGRAM.................... 15-1
PRECAUTIONS IN OPERATION....... 15-2
TROUBLE DIAGNOSIS ..................... 15-2
MECHANISM DIAGRAM
2.4~3.0kgf-m
0.8~1.2kgf-m
EXHAUST MUFFLER......................... 15-3
REAR WHEEL.................................... 15-3
REAR SHOCK ABSORBER ............... 15-4
3.5~4.5kgf-m
1.0~1.4kgf-m
3.0~3.6kgf-m 11.0~13.0kgf-m
15-1
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15. REAR WHEEL/REAR SHOCK ABSORBER SYM
PRECAUTIONS IN OPERATION
General Information
As for the wheel removal, service, and installation procedures, please refer to the service manual of high speed tire.
Wheel wobbling
Radial - 2.0
Axial - 2.0
Thickness of rear brake lining 4.0 2.0
Torque values:
Rear axle nut
Rear shock absorber upper mount bolt
Rear shock absorber lower mount bolt
Exhaust muffler connection nut
Exhaust muffler connection bolt
TROUBLE DIAGNOSIS
Rear wheel wobbling
bend wheel rim
poor tire
loosen wheel shaft
Shock absorber too soft
insufficient shock absorber spring force
Braking Noise
worn brake lining
brake drum deformation
improperly brake panel installation
unparalleled brake drum or wheel unparallel.
11.0~13.0kgf-m
3.5~4.5kgf-m
2.4~3.0kgf-m
1.0~1.4kgf-m
3.0~3.6kgf-m
Poor brake performance
Poor brake adjustment
contaminated brake lining
worn brake lining
greased brake drum
contaminated and seized brake cable
improperly installation of brake cable
15-2
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SYM 15. REAR WHEEL/REAR SHOCK ABSORBER
EXHAUST MUFFLER
Removal
Remove the front-end nut of the exhaust muffler. (nuts x 2)
Remove the bolts. (bolts x 2)
Remove the exhaust muffler.
Installation
Install the exhaust muffler according to the reverse procedure of removal.
Exhaust muffler
Caution
Replace the exhaust muffler gasket if it is broken or deformed.
Torque value:
Exhaust muffler connection bolt:
3.0~3.6kgf-m
Exhaust muffler connection nut:
1.0~1.4kgf-m
REAR WHEEL
Inspection
Measure wheel rim wobbling.
Service limit:
Radial: 2.0mm
Axial: 2.0mm
If the wheel rim wobbling out of the specification, except resulted from the wheel rim deformation, it might be loosen or worn final driving shaft bearing or bend, deformed driving shaft.
Removal
Remove the right cover.(screws x 4)
Remove the battery. (bolts x 2)
Remove the battery cover assembly. (bolts x2, nuts x 2)
Remove the rear wheel. (wheel axle nut x1)
Nuts x 2
Bolts x 2
15-3
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15. REAR WHEEL/REAR SHOCK ABSORBER SYM
REAR SHOCK ABSORBER
Removal
Remove the left & right covers. (screws x 8)
Remove the luggage box. (bolts x 4, nuts x 2, screw x 1)
Remove the rear carrier. (bolts x 3)
Remove the body cover (bolts x2)
Remove the air cleaner bolts (bolts x2)
Remove the lower nut of the rear shock absorber (bolt x 1)
Remove the upper nut of the rear shock absorber (bolt x 1)
Remove the rear shock absorber. lower mount bolt
Installation
Install the rear shock absorber according to the reverse procedure of removal.
Caution
The rear shock absorber has to be replaced with one set and can not be replaced by unauthorized persons. Otherwise, it might damage the rubber bushing and construction.
Torque values
Rear shock absorber lower mount bolt:
2.4~3.0 kgf-m
Rear shock absorber upper mount bolt:
3.5~4.5 kgf-m upper mount bolt
15-4
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SYM 16. ELECTRICAL EQUIPMENT
MECHANISM DIAGRAM ....................16-1
PRECAUTIONS IN OPERATION .......16-2
SPECIFICATION ................................16-3
TROUBLE DIAGNOSIS......................16-4
CHARGING SYSTEM.........................16-5
IGNITION SYSTEM ............................16-11
MECHANISM DIAGRAM
Front/Rear stop switch
Winker relay
REG.REC/Horn/
/Resistor
Starting/headlight switch
Fuel unit
Starter magnetic switch
Engine start control switch
Spark plug
STARTING SYSTEM ..........................16-14
METER ...............................................16-15
LIGHTS/BULBS ..................................16-17
MAIN SWITCH/HORN ........................16-19
FUEL UNIT .........................................16-22
High & low beam/seat open/turn signal light/Horn
Main switch
Battery/ fuse box
/C.D.I
Auto by-star
Ignition coil
Alternator
16-1
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16. ELECTRICAL EQUIPMENT SYM
PRECAUTIONS IN OPERATION
Charging System
When remove the battery, the disconnection sequence of cable terminals shall be strictly observed.
(First disconnect the negative cable terminal, next, the positive cable terminal.)
MF (Maintenance Free) battery does not need to check, add electrolyte or distilled water.
Battery must be taken out from scooter when charging the battery. But do not open the battery caps.
Do not quick charge the battery unless in emergency.
A voltmeter must be used when checking battery charging condition.
Battery can be charged or discharged alternately. To set a discharged battery idle for a prolonged period will shorten its service life and reduce its capacity. Usually, battery’s capacity will reduce after
1~2 years. After low capacity battery was charged, its voltage will increase. If it connects to an additional load, the voltage will reduce suddenly, and then go up again.
Over-charged battery. Usually, the over-charged battery can be seen externally. If a short circuit occurred inside the battery, there will be no voltage on the terminals of battery if voltage regulator does not operate. Then, the battery’s voltage will be too high that may reduce battery’s life.
The battery will be self-discharged if it was set idle for a long time. An idle battery must be charged about every 2months.
A new battery filled with electrolyte will generate a voltage after filled out electrolyte. The voltage should be in 12.5V or more after 10 minutes. When electrolyte is not enough, the battery must be filled with electrolyte and then charged to prolong the battery’s life-span.
Please check electrical device according to the procedure of diagnosis chart.
Do not disconnect and connect the connector of electrical devices when current is passing these devices because this will generate high voltage and the electrical components in the voltage-current regulator will be damaged. The ignition switch must be turned OFF before performing any work.
Please do not replace with traditional type battery as replacement.
Please refer to the removal instruction when removing the alternator and the pulse generator.
Ignition System
Please follow the procedure of trouble diagnosis chart to check ignition system.
The ignition system equipped with a auto-advanced timing device in CDI unit. Thus, ignition timing need not to be adjusted. In case of incorrect ignition timing occurred, check the CDI unit or alternator system. It has to check the ignition timing with the ignition timing light if replaced these components.
Do not hang or impact the CDI unit of ignition system because the major faulty of CDI unit is caused by impact. Therefore, take care when disassembling.
Most of ignition system problems were resulted from poor connecting connector. Please check the connectors first when servicing.
Make sure that the heat range of spark plug is suitable. Improper spark plug is the main cause of poor engine operation or combustion.
Inspection procedures in this manual are based on Max. voltage. This manual also contains methods of how to check ignition coil resistance and component operation.
Please follow the continuity chart to check ignition switch.
Starting System
Starting motor can be removed directly from engine.
Please refer to chapter 10 for starting clutch removal procedures.
16-2
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SYM 16. ELECTRICAL EQUIPMENT
Specification
Charging System
Items Specification
Battery
Alternator
Capacity/type
Charging rate
Voltage
(20℃)
Full charged
12V 6Ah(MF)
STD:0.6A/5~10hrs, emergency charging:
6A/0.5hrs
13.1V
Under charged 12.3V
Capacity 12V / 6.2A
Lighting coil resistance (20℃) Between yellow-green: 0.8±0.1Ω
Charging coil resistance (20℃) Between white-green: 0.6±0.1Ω
Leaking current
RPM for starting charging
Less 1mA
1700rpm(headlight ON)
Resistance (20℃) 5W5Ω
Resistor
Resistance (20℃) 30W7.5Ω
Ignition System
4.5~5.5
7.0~8.0
Ω
Ω
Item Specification
Spark plug
Ignition coil resistance
(20℃)
Standard
Hot type
NGK CR7HSA (Recommended usage)
NGK CR8HSA
Cold type NGK CR6HSA
Spark plug gap 0.6~0.7 mm
Primary 0.21±10%
Ω
With plug cap : 7.6±10%K
Ω
Secondary
Without plug cap : 3.1±10%K
Ω
“F” Mark Before TDC 13°±3°/<1800 rpm
Ignition timing
Timing advanced character
Pulse generator resistance (20℃)
Exciting coil resistance (20℃)
Ignition coil-primary max. voltage
Before TDC 28° / 4000 rpm
Before TDC 27° / 8000 rpm
50~200
Ω
400~800
Ω
95~400 V
Pulse generator voltage
Exciting coil voltage
Starting System
1.7 V above
95~400 V
Item Specification
Starting motor
16-3
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16. ELECTRICAL EQUIPMENT SYM
TROUBLE DIAGNOSIS
Charging System
No power supply
Dead battery
Disconnect battery cable
Fuse burned out
Faulty ignition switch
Low voltage
Weak battery
Loose battery connection
Charging system failure
Voltage-current regulator failure
Intermittent power supply
Loosen wire connector in charging system
Loose battery cables
Loose charging system connection
Loose connection in lighting system
Charging system failure
burn Fuse
Loose, broken or shorted wire or wire connection
Faulty voltage-current regulator
Faulty alternator
Starting System
Starter motor does not work
The fuse is blown
The battery is not fully charge
Poor main switch
Poor starter switch
The front and rear brake switches do not operate correctly
Starter magnetic switch is out of work
The ignition coil is poorly connected, open or short-circuited
The starter motor is out of work
Ignition
System
No spark produced by spark plug
The spark plug is out of work
The cable is poorly connected, open or short-circuited
- Between alternator and C.D.I.
- Between CDI and ignition coil.
- Between CDI and main switch
Poor main switch
Poor C.D.I. alternator is out of work
Engine does not crank smoothly
Primary coil circuit
- Poor ignition coil
- Poor connection of cable and connectors
- Poor main switch
Secondary coil circuit
- Poor ignition coil
- Poor spark plug
- Poor high-tension cable
- Current leakage in the spark plug cap
Incorrect ignition timing
- Poor alternator
- Improper installation of the pulse sensor
-
Poor C.D.I.
Weak starter motor
Poor charging system
The battery is not fully charged
Poor connection in the windings
The motor gear is jammed by foreign material
Starter motor is working, but engine does not crank
Poor starter motor pinion
Poor starter clutch
The starter motor run in reverse direction
Poor battery
16-4
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SYM 16. ELECTRICAL EQUIPMENT
CHARGING SYSTEM
Charging wire diagram alternator yellow white
REG.REC. green/black
Auto by-starter
5
W
5
Ω
Current Leakage Inspection
Turn the main switch to OFF position, and remove the negative cable terminal (-) from the battery.
Connect an ammeter between the negative cable terminal and the battery negative terminal (as shown on left diagram). red green fuse(7A
) red
Battery
12V 6AH green green
Battery(-) terminal
Caution
In the current leakage test, set the current range at larger scale, then gradually decrease to the lower scale as the test process goes to avoid possible damage to the ammeter and the fuse.
Do not turn the main switch to “ON” position during test.
If the leaked current exceeds the specified value, it may indicate a short circuit.
Allowable current leakage: Less than 1 mA.
Disconnect each cable one by one and take measurement of the current of each cable to locate the short circuit. ground wire
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16. ELECTRICAL EQUIPMENT SYM
Battery
Removal
Remove the 4 screws on the battery cover.
(Screws x 4).
4 screws
Battery cover
CAUTION
Electrolyte (diluted sulfuric acid) is very toxic. Once it spreading on clothes, skin, or eyes, it will cause burned or blind. In case of being spread, flush with great quantity of water immediately, and then send to hospital.
When clothes is spread by electrolyte, it will contact with skin. So, it must flush with great quantity water to take off the clothes.
Remove the battery cover.
Disconnect the negative (-) cable from the battery first, then the positive (+) cable.
Remove the battery.
Install the battery in reverse order of removal. positive (+) fuse negative (-)
C.D.I.
CAUTION
To prevent form circuit short, connect positive(+) terminal at first, and next negative (-) terminal.
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SYM 16. ELECTRICAL EQUIPMENT
Voltage Check
With a digital voltage meter or multi-meter to measure battery voltage.
Voltage:
Fully charged: 13.0 – 13.2V (at 20℃)
Undercharged: Below 12.3 V (at 20℃)
CHARGING
Connect the Charger positive (+) to the battery positive (+) terminal.
Connect the Charger negative (-) to the battery negative (-) terminal.
Standard Max.
Charging current
0.6A 6.0A
Charging time
5~10H 1H
Warning
Strictly keep flames away from a charging battery.
The charging “ON”/ “OFF” is controlled by the charger’s switch. Do not control the charging by battery jump wires.
Turn the charger’s switch “OFF” at first before or after charging to prevent from sparks created on the connectors and explosion.
To charge a battery must be based on the battery’s ampere-hour showed on label.
CAUTION
Quick charge a battery should be used only in an emergency.
Make sure the current and charging time of above description.
The battery will be damaged by too much current or too rush charging.
When finishing charge, it is necessary to measure voltage after 30 minutes.
After installing the battery, coat the terminals with clean grease.
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16. ELECTRICAL EQUIPMENT SYM
Charging Voltage/Current
Inspection
Caution
Before conducting the inspection, be sure that the battery is fully charged.
Use a fully charged battery having a voltage larger than 13.0 V. If undercharged, the current changes dramatically.
While starting the engine, the starter motor draws large amount of current from the battery. Thus, do not start the engine with battery.
After the engine is warmed up, replace original battery with a fully charged battery.
Connect a digital voltmeter to the battery terminals.
Connect an ammeter between both ends of the main fuse.
Caution
When the probe is reversibly connected, use a voltmeter having an indication that the current flows from the positive or the negative direction and the measurement should be at zero, ammeter at one direction only. digital voltmeter ammeter
Fuse ends
Connect a tachometer.
Turn on the headlight to high beam and start the engine.
Accelerate the engine gradually to the specified revolution per minute and measure the charging voltage/current.
Specified Charging Current:
(headlight OFF) 0.6 A or more/2500rpm
1.2 A or more / 6000 rpm
(headlight ON) 0.4 A or more/2500rpm
1.0 A or more / 6000 rpm
Control Charging Voltage:
14.0+/0.5 V / 2000 rpm
Caution
Do not use short-circuit cable.
It is possible to measure the current by connecting an ammeter between the battery positive terminal and the cable position terminal, however, while the starter motor is activated, the surge current of the motor draws from the battery may damage the ammeter. Use the kick lever to start the engine.
The main switch shall be turned to OFF position during the process of inspection.
Never tamper with the ammeter and the cable while there is current flowing through. It may damage the ammeter.
Caution
To replace the old battery, use a new battery with the same current and voltage.
The following problems are related to the charging system, follow the instructions provided in the checking list to correct it if any one of the problems takes place.
(1) The charging voltage can not exceed the voltage between two battery terminals and the charging current is in the discharging direction.
(2) The charging voltage and current are too much higher than the standard values.
The following problems are not related to the charging system; correct it if any by following steps indicate in the checking list.
(1) The standard charging voltage and current can only reach when the revolution of the engine exceeds the specified rpm.
Bulbs used exceed their rate and consume too much power.
The replacement battery is aged and does not have enough capacity.
(2) The charging voltage is normal, but the current is not.
The replacement battery is aged and does not have enough capacity.
Battery used do not have enough electricity or is over charged.
The fuse of the ammeter is blown.
The ammeter is improperly connected.
(3) The charging current is normal, but the voltage is not.
The fuse of the voltmeter is blown.
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SYM 16. ELECTRICAL EQUIPMENT
VOLTAGE REGULATOR INSPECTION
Remove the front cover. (screws x 3 x 2).
Remove the front cover mounting screw(screws x 1)and remove the headlight wiring connector.
Disconnect the 4P connector on the diode, and check the continuity between main wire terminals according to following method.
REG.REC
Main wire circuit inspection
Item (wire color)
Check voltage between battery terminal (red) and
Judgment
Battery voltage ground (green).
Check continuity between ground(green) and frame.
Check illumination wire
(yellow) to ground.
(disconnect the connector of the resistor’s pin and automatic by-starter pin.
Illumination switch is in OFF)
Continuity
Continuity & resistance
Check charging coil (white) to Continuity & ground) resistance
If the measured value is abnormal, check the abnormal wire circuit. If components are good, it could be a poor wire circuit.
If all items are in good condition, then replace the voltage regulator.
If main wire circuit check is in normal and there is no loose in the pins of voltage regulator connector, then measure the resistance between the connector of voltage regulator.
Voltage Regulator Check Unit:
Ω
Multi-meter(+)
Red White Yellow Green
Multi-meter
(R) (W) (Y) (G)
Red (R) ∞ ∞ ∞
White (W)
Yellow (Y)
∞
∞
0.04~0.06
0.04~0.06
160~180
160~180
Green (G)
∞
160~180 160~180
If the resistance values are abnormal among the pins, replace the voltage regulator.
REG.REC
Caution
Do not touch the probe of multi-meter by fingers, then the resistance values will be incorrect because there is some resistance existence in human body.
To use the multi-meter recommended by
SYM. Otherwise, the measured resistance might be different.
White
Green
RED
Yellow
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16. ELECTRICAL EQUIPMENT SYM
Alternator charging coil
Ignition connector light coil connector
Charging coil connector
Caution
The check of alternator charging coil and illumination coil can be done when the alternator is mounted on engine.
Check
Remove the 3P connector of the alternator.
Measure the resistance between the white wire on the alternator and frame ground with a multi-meter.
Standard: 0.6±0.1Ω (20℃)
Replace the alternator charging coil if the measured value exceeds standard.
Alternator lighting coil
Check
Remove the 3P connector of the alternator.
Measure the resistance between the yellow wire on the alternator and frame ground by multi-meter.
Standard: 0.8±0.1Ω (20℃)
Replace the alternator lighting coil if the measured value exceeds standard.
Resistor check
Remove the front cover.
Measure the resistance between the resistor wire (green/black) and frame ground.
Standard: 5Ω/5W: 4.5~5.5(green/black)
Pulse generator connector
Auto by-starter resistors
Standard: 7.5Ω/30W: 7.0~8.0(pink)
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SYM 16. ELECTRICAL EQUIPMENT
IGNITION SYSTEM
Ignition System Circuit
Pluser green green
Black/red
Black/red green
Blue/yellow
Black/white
C.D.I. unit main switch
Blue /yellow
Black/ yellow
Black/ white black/yellow
Ignition coil green green spark plug
CDI UNIT
Removal
Remove the right body cover, then the C.D.I. unit can be removed from the frame.
CDI UNIT
Check
Disconnect the connector from the CDI unit.
Make the following inspection at each terminal of the harness side connector.
ITEM Measure at: Standard (at 20C)
Pulse Generator
Primary Black/yellow-green 0.21
Ω±10%
Ignition
Coil
Secondary
Green-high voltage cable -w/o cap 3~5K
Ω
Green-high voltage cable - w/ cap 7~12K
Ω
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16. ELECTRICAL EQUIPMENT
Ignition coil
Removal
Remove the luggage box, center cover.
Remove spark plug cap.
Remove the primary coil wire of ignition coil.
Remove the fix bolts for the ignition coil, and remove the ignition coil.
Install the ignition coil in reverse order of removal.
Caution
Install primary coil with black/yellow lead connected to black connector and green lead connected to green connector.
Spark plug confirmation
Remove the spark plug and install a good plug into plug cap, and then ground it to engine ground.
Make sure its spark condition. If it is in not good or burnt spark plug, replace the spark plug with new one.
Caution
Make sure each wire connection is correct, and test as required. Even the wire connection is in correct, sometimes, it might not be tested occurred.
Connect the high voltage shunt with a multi-meter or input a resistor in the 10MΩ
100V of voltage meter.
Connect ignition coil wires, and connect a shunt between primary terminal (black/yellow and green) and frame ground.
Press the starting motor button, or starting lever to test the max. primary voltage of ignition coil.
Connection: connect (+) terminal to green side, and (-) to black/yellow side.
Min. voltage: Above 95 V.
Caution
Do not touch metal parts on the test probe with fingers to avoid electric shock.
Primary coil check
Disconnect the primary coil connector and check the resistance between primary coil terminals.
Standard: 0.21Ω±10%Ω(at 20℃)
Primary coil is good if resistance within standard.
Primary coil is broken if resistance is infinite.
Replace the coil.
Ignition coil high voltage shunt
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black/yellow green
SYM 16. ELECTRICAL EQUIPMENT
Secondary coil
Attached the spark plug cap, measure the resistance between plug cap side and green terminal.
Standard value: 7-12 kΩ(20℃)
Remove the spark plug cap, measure the resistance between plug cap side and green terminal.
Standard value: 3-5 kΩ(20℃)
Secondary coil is good if resistance within standard.
Secondary coil is broken if resistance is infinite. If the spark plug cap attached and the measured value is exceed standard value, it means the spark plug cap is in not good.
Replacement
Remove the ignition coil bolt to replace the ignition coil if necessary.
Pulse generator
Ignition coil
Caution
Checking pulse generator can be done on engine. But, the spark plug must be installed onto the cylinder head, and cylinder compression pressure must be in normal condition.
Check
Remove body cover.
Remove the pulse generator connector.
Measure the resistance between blue/yellow terminal on engine side and frame ground.
Standard: 140±20Ω(20℃)
Replace the alternator if the measured value exceeds standard value.
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16. ELECTRICAL EQUIPMENT
STARTING SYSTEM
Starting Circuit
Starter magnetic switch inspection
Turn main switch to "on", and operate the brake lever. Then press starting button to check if there a click sound. It is normal if there is a click sound.
Remove the luggage box.
Disconnect the battery negative (-) terminal.
Remove the battery positive (+) connection and starting motor wires from the starter magnetic switch large pin.
Remove the power control connector of the
Starter magnetic switch.
Connect a Ohmmeter between the Starter magnetic switch large pins.
Connect the green/yellow wire to battery positive (+) terminal, and yellow/red to battery negative (-) terminal.
Check the continuity between the Starter magnetic switch large pins. If it is not continuity, then replace the starter magnetic switch.
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Starter magnetic switch
Starter magnetic switch http://www.motorcycle.in.th
SYM 16. ELECTRICAL EQUIPMENT
Starting Motor Removal
Remove the right side cover. (screws x3)
Firstly, remove the battery negative (-) terminal, and then remove the positive (+) terminal.
Remove the luggage box.
Remove the starting motor power wire.
Remove the starting motor mounting bolts and motor.
Starting Motor Installation
Install the motor in reverse order of removal.
Bolts x2
METER
Removal
Remove the front handle cover.
Remove the speedometer cable.
Remove the front cover.
Remove the power connector of the meter.
Meter
Meter connector speedometer cable
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16. ELECTRICAL EQUIPMENT
Remove the rear handle cover.
Remove the meter mounting screws.
Take out the meter.
Speedometer
Turn Left Signal
Indicator
Odometer
High Beam Indicator
Turn Right
Signal Indicator
Fuel meter
Caution
Do not wipe the meter or headlight with organic solvent such as gasoline to prevent from damage these components.
Installation
Install the meter in reverse order of removal.
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SYM 16. ELECTRICAL EQUIPMENT
LIGHT/BULBS
Headlight Bulb Replacement
Remove the left/right back mirror.
Remove the front handle cover.
Disconnect the headlight wire connector.
Press down the bulb spring locker and then remove the locker with turning it left motion.
Remove the bulb.
Replace the bulb with new one if necessary.
(12V 35W/35W)
Caution
Do not touch the bulb surface with fingers because the bulb will create hot-spot so that let it be burnt. It has to be package with cloth or wear glove as installing.
Wipe the bulb with cloth to prevent from damaged if the bulb be touched by hands.
Install the bulb in reverse order of removal.
Turn the main switch ON/OFF to check if the bulb has been installed properly after installation.
Please conduct the headlight beam adjustment job if replace the headlight bulb.
The headlight beam adjustment
Loosen the adjustment bolt located under the front handle cover. headlight beam adjustment screw
Caution
This outer cover of headlight is a fixed type so that the light seat will be moved only when adjusting.
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16. ELECTRICAL EQUIPMENT
Front Turn Signal Lamp Bulb
Replacement
Remove the front cover.
Remove the wire connector of the turn signal light.
Pull out the bulb and replace it with new one.
(12V 10W)
Installation
Install the bulb in reverse order of removal.
Bulbs Replacement of tail light/brake light/rear turn signal light.
Remove the 2 screws of the tail light assembly.
Replace the bulbs of the tail light, brake light
(12V 5W/21W)
Replace the bulbs of the turn signal light
(12V/10W).
Installation
Install the bulb in reverse order of removal.
Front turn signal light the wire connector of the turn signal light
2 screws turn signal light tail light & brake light
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SYM 16. ELECTRICAL EQUIPMENT
MAIN SWITCH/HORN
Main Switch
Check
Remove the headlight connector and the front cover.
Disconnect main switch leads connector.
Check connector terminals for continuity. main switch connector terminals color
Black
Location
Black/ white
LOCK
●
Red Green
●
Green
(2)
OFF
●
● main switch bolts x 2
ON
●
●
Replacement
Remove the main switch connector and fixing bolts (bolts x 2)
Remove the main switch.
Install a new main switch and tighten the bolts. (bolts x2) http://www.motorcycle.in.th
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16. ELECTRICAL EQUIPMENT
Handle switch
Remove the front handle cover.
Disconnect the connector of the handle switch.
Check the continuity of follow pins listed below columns.
Headlight switch
color
Brown Yellow Pink
Location
Brown
/White
●
● ●
Yellow
●
●
●
●
Starting switch
Location color
Yellow/red
● green
●
FREE
● ●
High/Low beam switch/ seat open
color blue white
Location brown/ white black purple
● ●
●
● seat open ●
Horn switch color
Location
Black
● ●
Light green
●
FREE
●
● headlight switch brown /white brown yellow yellow/red turn signal switch horn switch
Black
Blue orange
Sky blue
Black starting switch yellow headlight switch pink green
Starting switch
High/Low beam switch/ seat open
High/Low beam switch/ seat open white brown/white turn signal switch gray
Light green
Horn switch
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SYM 16. ELECTRICAL EQUIPMENT
Turn signal light switch
Location
color Sky blue
Gray orange
● ●
FROM R
● ● orange turn signal light switch
N
FROM L
● ●
● ●
Brake light switch
The circuit of black wire and the green/yellow wire on the brake light switch should be in continuity when operating the brake lever.
If the switch damaged, replace it with new one.
Horn
Remove the front cover.
Connect the light blue wire on the horn to the battery positive (+) terminal, and the green wire to the battery negative (-) terminal. Then, the horn should sound.
Replace it if necessary.
Sky blue gray http://www.motorcycle.in.th
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16. ELECTRICAL EQUIPMENT
FUEL UNIT
Open the seat.
Remove the luggage box(bolts x 6) .
Remove the engine start control switch wire connector.
Disconnect the fuel unit wire connector.
Caution
Do not damage or bend the float arm as removing.
The resistance values are listed below when the float arm in “F” and “E” positions.
Float arm position Resistance value
E(empty) 97.5~107.5
Ω
4~10
Ω
F(full)
DOWN(empty)Connect the fuel unit to the main harness.
Turn the main switch “ON” position.
Move the float arm in “UP” & “DOWN”, and then check if the fuel unit indication needle is in correct position.
Caution
Turn on the turn signal light to make sure battery is in good condition before this test.
Float arm position Indicator needle
UP(full) E(empty)
DOWN(empty) F(full)
UP
(full)
DOWN
(empty)
Fuel unit
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