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SERVICE MANUAL
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This service manual contains the technical data of each component inspection
and repair for the SANYANG JET 50/100 and JET Euro 50/100 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, JET 50/100 and JET Euro
50/100 series, are different from that of the photos, pictures shown in this
manual, the actual vehicle shall prevail. Specifications are subject to change
without notice.
Service Department
Sanyang Industry Co., LTD.
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Contents
How to Use This Manual
This service manual describes basic information of different system parts and
system inspection & service for Sanyang JET 50/100 and JET Euro 50/100
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 information.
Th third to the tenth nine chapters covers engine and driving systems.
The tenth to the fourteenth is contained the parts set of assembly body.
The fifteenth chapter is electrical equipment.
The sixteenth chapter is wiring diagram
Please see index of content for quick
having the special parts and system
information.
All information, illustration, directions and specifications included in this manual
are current as at the time of publication. Sanyang reserves the rights to make
changes at any time without prior notice and without incurring any obligation
whatever. Without written consent by SANYANG can not copy any part of this
manual.
There are 4 buttons, “Forward,” “How to use this manual,” “Mechanism
Illustrations,” and “Contents” on the CD-R version, and can be access to
these items by click the mouse.
If user wants to look for the content of each chapter, selecting the words of
each chapter on the main contents can reach to each chapter. There are
two buttons, Back to homepage and Main contents, onto the top line of first
page of the each chapter. Thus, if the user needs to check other chapters, he
can click the top buttons to back the homepage or main contents. The
content of each chapter can be selected too. Therefore, when needs to
checking the content inside of the chapter, click the content words of the
chapter so that can back to the initial section of the content. In addition,
there is a “This chapter contents” button at the top line of each page so that
clicking the button can back to the contents of this chapter.
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CONTENTS
Page
Content
Index
1-1 ~ 1-18
GENERAL INFORMATION
1
2-1 ~ 2-14
SERVICE MAINTENANCE INFORMATION
2
3-1 ~ 3-6
LUBRICATION SYSTEM
3
4-1 ~ 4-4
ENGINE REMOVAL
4
5-1 ~ 5-8
CYLINDER HEAD/CYLINDER/PISTON
5
6-1 ~ 6-4
ALTERNATOR
6
“V” TYPE BELT DRIVING SYSTEM/KICK-STARTER
7
8-1 ~ 8-6
FINAL DRIVING MECHANISM
8
9-1 ~ 9-6
CRANKCASE/CRANKSHAFT
9
7-1 ~ 7-14
10-1 ~ 10-10 FUEL SYSTEM
10
11-1 ~ 11-12 BRAKE SYSTEM
11
12-1 ~ 12-12 BODY COVER
12
13-1 ~ 13-10 STEERING/FRONT WHEEL/SUSPENSION
13
14-1 ~ 14-4 REAR WHEEL/SUSPENSION
15-1 ~ 15-22 ELECTRICAL EQUIPMENT
16-1 ~ 16-4 ELECTRICAL DIAGRAM
14
15
16
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Contents
MODEL ILLUSTRATION
JET 50 / 100 Series
Light / Starter switch
Fuel tank cap
Rear turn signal
Seat lock
Front turn signal
Rear turn signal
Helmet hook
High & Low beam /
Turn signal / Horn switch
Battery / Fuses / C.D.I. /
Eng. Oil tank cap
Frame number
Tail light
Head light
Storage box
Air cleaner
Ignition switch
Front brake lever
Rear brake lever
Engine number
Muffler
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Contents
MODEL ILLUSTRATION
JET Euro Series
Light / Starter switch
Fuel tank cap
Rear turn signal
Seat lock
Front turn signal
Rear turn signal
Helmet hook
High & Low beam /
Turn signal / Horn switch
Battery / Fuses / C.D.I. /
Eng. Oil tank cap
Frame number
Tail light
Head light
Storage box
Air cleaner
Ignition switch
Front brake lever
Rear brake lever
Engine number
Muffler
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Contents
1. GENERAL INFORMATION
Symbols and Marks···························1-1
Torque values ·································· 1-7
General Safety ···································1-2
Cables and Harness Routing·········· 1-9
Service Precautions ··························1-3
Troubleshooting ······························ 1-13
Specifications····································1-5
Lubrication Points··························· 1-17
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
Caution
Engine oil
Grease
Means that serious injury or even death may result if procedures are not
followed.
Means that equipment damages may result if procedures are not
followed.
Limits to use SAE 20 JASO FC class oil. Warranty will not cover the
damage that caused by not apply with the limited engine oil.
(Recommended oil: MAX-2 serial oils)
King Mate G-3 is recommended.
Locking
sealant
King Mate gear oil serials are recommended. (Bramax HYPOID GEAR
OIL # 140)
Apply sealant, medium strength sealant should be used unless
otherwise specified.
Oil seal
Apply with lubricant.
Renew
Replace with a new part before installation.
Brake fluid
Use recommended brake fluid DOT3 or WELLRUN brake fluid.
Special tools
Special tools.
O
Correct
Meaning correct installation.
X
Wrong
Meaning wrong installation.
Indication
Indication of components.
Directions
Indicates position and operation directions.
Gear oil
Components assembly directions each other.
Indicates where the bolt installation direction, --- means that bolt cross
through the component (invisibility).
1-1
1
This chapter Contents
1. GENERAL INFORMATION
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 verified.
We recommend that you wash your hands
with soap and water right after contacting.
Keep the used oil beyond reach of children.
Battery
Caution
y
Battery emits explosive gases; flame is
strictly prohibited. Keep the place well
ventilated when charging the battery.
y 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 and then go to
hospital to see an ophthalmologist.
y 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.
y Keep electrolyte beyond reach of children.
Brake shoe
Do not use an air hose or a dry brush to clean
components of the brake system, use a vacuum
cleaner or the equivalent to avoid dust flying.
Caution
Inhaling dust may cause disorders and cancer
of the breathing system.
Brake fluid
Caution
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.
1-2
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 the brake fluid beyond reach of
children.
This chapter Contents
1. GENERAL INFORMATION
Service Precautions
z
Always use with Sanyang genuine parts and
recommended oils. Using non-designed parts
for Sanyang motorcycle may damage the
motorcycle.
z
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.
z
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.
z
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.
z
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.
z
z
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.
z
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.
z
Store complex components such as
transmission parts in the proper assemble
order and tie them together with a wire for ease
of installation later.
z
Note the reassemble position of the important
components before disassembling them to
ensure they will be reassembled in correct
dimensions (depth, distance or position).
z
Components not to be reused should be
replaced when disassembled including gaskets
metal seal rings, O-rings, oil seals, snap rings,
and split pins.
Never bend or twist a control cable to prevent
stiff control and premature worn out.
Caution
In addition to damaging paint finish, brake oil
can also damage the structural integration of
plastic or rubber parts.
1-3
This chapter Contents
1. GENERAL INFORMATION
z
z
z
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.
z
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.
z
Rubber and plastic boots should be properly
reinstalled to the original correct positions as
designed.
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.
Boots
z
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.
Manufacturer's name
z
Remove residues of the old gasket or sealant
before reinstallation, grind with a grindstone if
the contact surface has any damage.
Both of these examples can result in bearing damage.
z
1-4
Lubricate the rotation face as assembling.
Check if positions and operation for installed
parts is in correct and properly.
This chapter Contents
1. GENERAL INFORMATION
Specifications
1785 mm
Overall Width
630 mm
Overall Height
1115 mm
Wheel Base
1275 mm
Front
40 kg
Rear
54 kg
Total
94 kg
MODEL
Front
TELESCOPIC
Rear
UNlT SWING
Tire
Specifications
Front
120 / 70 – 12
Rear
130 / 70 – 12
Front
DlSK (ψ190mm)
Rear
DRUM (ψ110mm)
Brake System
Two /110 kg
Front
84 kg
Rear
120 kg
Total
204 kg
JET 50 SERIES
Suspension
System
FORMAN PERCE
Total Weight
Passengers /
Weight
Max. Speed
50 km/hr Below
Climb Ability
22° Below
Primary Reduction
BELT
Secondary
Reduction
GEAR
Clutch
Centrifugal, dry type
Transmission
C.V.T.
Type
Gasoline
Installation and
arrangement
Horizontal, below
center, incline
Fuel Used
Unleaded (92/95)
Speedometer
0 ~ 90 km/hr
Cycle/Cooling
2-stroke/forced air
cooled
Horn
80 ~ 112 dB/A
Bore
39 mm
Muffler
Expansion & Pulse Type
Stroke
41.4 mm
Number/Arran
gement
Single Cylinder
Exhaust Pipe Position
Right side, and Backward
and Direction
Lubrication System
Exhaust
Concentration
Cylinder
WEIGHT
ENGINE
SANYANG
Overall Length
Curb
Weight
DIMENSION
Make
Separated-lubrication
Displacement
49.4 cc
Solid Particulate
Compression
Ratio
7.2 : 1
Max. HP
3.2 kw / 7000 rpm
Max. Torque
4.6 Nm / 6500 rpm
E.E.C.
Below 2g / test
Ignition
C.D.I.
P.C.V.
X
Starting System
Electrical & kick
Catalytic reaction
control system
○
CO
8.0 g/km ↓
HC
5.0 g/km ↓
1-5
This chapter Contents
1. GENERAL INFORMATION
Specifications
1785 mm
Overall Width
630 mm
Overall Height
1115 mm
Wheel Base
1275 mm
Front
40 kg
Rear
54 kg
Total
94 kg
MODEL
Front
TELESCOPIC
Rear
UNlT SWING
Tire
Specifications
Front
120 / 70 – 12
Rear
130 / 70 – 12
Front
DlSK (ψ190mm)
Rear
DRUM (ψ110mm)
Brake System
Two /110 kg
Front
84.5 kg
Rear
122.5 kg
Total
207 kg
JET 100 SERIES
Suspension
System
FORMAN PERCE
Total Weight
Passengers /
Weight
Max. Speed
50 km/hr Below
Climb Ability
22° Below
Primary Reduction
BELT
Secondary
Reduction
GEAR
Clutch
Centrifugal, dry type
Transmission
C.V.T.
Type
Gasoline
Installation and
arrangement
Horizontal, below
center, incline
Fuel Used
Unleaded (92/95)
Speedometer
0 ~ 120 km/hr
Cycle/Cooling
2-stroke/forced air
cooled
Horn
80 ~ 90 dB/A
Bore
51 mm
Muffler
Expansion & Pulse Type
Stroke
49.6 mm
Number/Arran
gement
Single Cylinder
Exhaust Pipe Position
Right side, and Backward
and Direction
Lubrication System
Exhaust
Concentration
Cylinder
WEIGHT
ENGINE
1-6
SANYANG
Overall Length
Curb
Weight
DIMENSION
Make
Separated-lubrication
Displacement
101.3 cc
Solid Particulate
Compression
Ratio
6.3 : 1
Max. HP
7.0 ps / 6500 rpm
Max. Torque
0.89 kg-m / 5500 rpm
E.E.C.
Below 2g / test
Ignition
C.D.I.
P.C.V.
X
Starting System
Electrical & kick
Catalytic reaction
control system
X
CO
4.5 % ↓
HC
7000 ppm ↓
This chapter Contents
1. GENERAL INFORMATION
Torque values
Standard Torque Values for Reference
Type
Torque value
Type
Torque value
5 mm Bolt, nut
0.45 - 0.6 kg-m
5 mm Bolt
0.35 - 0.5 kg-m
6 mm Bolt, nut
0.8 - 1.2 kg-m
6 mm Bolt, SH nut
0.7 - 1.1 kg-m
8 mm Bolt, nut
1.8 - 2.5 kg-m
6 mm Flange bolt, nut
1.0 - 1.4 kg-m
10 mm Bolt, nut
3.0 - 4.0 kg-m
8 mm Flange bolt, nut
2.4 - 3.0 kg-m
12 mm Bolt, nut
5.0 - 6.0 kg-m
10 mm Flange bolt, nut
3.5 - 4.5 kg-m
The torque values listed in below table are for more important tighten torque values. Please see
above standard values for not listed in the table.
Engine
Thread Dia.
Torque Value
(mm)
(Kg-m)
4
6
1.0
Spark plug
1
14
1.4
Flywheel nut
1
10
3.8
Sliding driving disc nut
1
10
3.8
Sliding driving disc nut
1
28
5.5
Clutch outer cover nut
1
10
3.8
Drain bolts
1
8
1.3
Crankcase bolts
6
6
1.0
Item
Cylinder head bolt
Q’ty
Remarks
When engine
cooled
1-7
This chapter Contents
1. GENERAL INFORMATION
Frame
Item
Bolt for engine suspension
Bolt for engine suspension bracket
Upper bolt for rear shock absorber
Lower bolt for rear shock absorber
Mounting screws for exhaust pipe
connection
Nut for exhaust
Brake hose bolts
Brake caliper mounting bolts
Brake cushion guide bolts
Brake cushion guide bolts cap
Brake drain valve
Rear brake arm bolts
Tightening nut for steering rod
Front shaft nut
Mounting bolt for handle
Mounting nut for front hub
Mounting bolt for front brake disc
Rear shaft nut
Nut for rear hub
1-8
Thread Dia.
Torque Value
(mm)
(Kgf-m)
1
10
5.0
1
12
6.0
1
10
4.0
1
8
2.7
2
6
1.2
2
8
3.3
2
10
3.5
2
8
3.1
2
6
1.8
2
6
1.0
1
6
0.6
1
5
0.55
1
25.4
7.0
1
12
6.0
1
10
5.0
4
8
2.5
3
8
4.5
1
14
11.0
4
8
2.5
Q’ty
Remarks
This chapter Contents
1. GENERAL INFORMATION
Cables and Harness Routing
Note the following when routing cables
and wire harnesses:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
A loose wire, cable or harness may cause
safety hazard. After clamping, check each
wire to make sure it is secured.
Do not squeeze wires against the weld or its
clamp.
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.
Route harnesses so that they neither pull too
tight nor have excessive slack.
Protect wires or wire harnesses with
electrical tape or tube if they contact a sharp
edge or corner.
Route wire harnesses to avoid sharp edges
or corners.
Avoid the projected ends of bolts and
screws.
Keep wire harnesses far away from the
exhaust pipes and other hot parts.
Be sure grommets are seated in their groves
properly.
After clamping, check each harness to be
certain that it is not interfered with any
moving or sliding parts.
After routing, check that the wire harnesses
are not twisted or kink.
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.
Thoroughly clean the surface where tape is
to be applied.
Wrap electrical tape around the damaged
parts or replace them.
O:Correct
X:Wrong
1-9
This chapter Contents
1. GENERAL INFORMATION
Headlight switch
Speedometer
Winker switch
High/low beam switch
Starter switch
Horn switch
Front brake
lamp switch
Rear brake lamp switch
Throttle cable
Speedometer cable
Front brake cable
Rear brake cable
Headlight
Throttle cable
Winker relay
Main switch
Regulator
Horn
Resistor
Front brake hose
Speedometer cable
1-10
This chapter Contents
1. GENERAL INFORMATION
Front brake hose
Speedometer cable
Rear brake cable
Throttle cable
Winker relay
Fuel unit
Rear brake cable
Throttle cable
Front brake hose
Rear brake cable
Throttle cable
Fuel unit cord
Front brake hose
Fuel pump
Speedometer cable
Fuel filter
1-11
This chapter Contents
1. GENERAL INFORMATION
Battery
Fuse
Purge control valve
Oil control cable
C.D.I. UNIT
Fuel hose
Fuel pump
Carburetor
Fuel filter
Rear brake cable
Oil hose
Vacuum hose
Oil lever switch
1-12
This chapter Contents
1. GENERAL INFORMATION
Troubleshooting
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.
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
Check if sparks
Week sparks or no spark
at all
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
Perform cylinder
compression pressure test.
7. Malfunction of main switch
1. Piston ring seized
cylinder compression pressure normal
Low compression
pressure or no pressure
2. Malfunction of cylinder valves
3. Worn cylinder and piston ring
4. Cylinder gasket leak
5. Sand hole in compression parts
Re-start by following the
starting procedures
No ignition
6. Crankcase leakage for pre-compression
There are some signs of
ignition, but engine can
not be started
1. Malfunction of throttle valve operation
2. Air sucked into intake manifold
3. Incorrect ignition timing
Remove the spark plug
again and check it.
1. Fuel level in carburetor too high
Dry spark plug
Wet spark plug
2. Malfunction of throttle valve operation
3. Throttle valve opening too wide
Remove carburetor after 30
minutes and connect a hose
onto fuel supplement circuit.
Then blow the hose with air
Blowing in normal
Blowing clogged
1. Malfunction of auto-starter
1-13
This chapter Contents
1. GENERAL INFORMATION
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.
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
Check ignition timing
(Using ignition lamp)
Ignition timing correct
Incorrect ignition timing
1. Malfunction of CDI
2. Malfunction of AC generator
Check cylinder compression
pressure (using compression
pressure gauge)
1. Cylinder & piston ring worn out
2. Cylinder gasket leaked
Compression pressure correct
No compression pressure
3. Sand hole in compression parts
4. Valve deterioration
5. Crankcase leakage for
pre-compression
Check if carburetor is
clogged
Normal
Clogged
1. Remove dirt
Fouled and discoloration
1. Remove dirt
Remove spark plug
No foul or discoloration
2. Incorrect spark plug heat range
Check if engine over heat
1. Piston and cylinder worn out
2. Lean mixture
Normal
Engine overheat
3. Poor fuel quality
4. Too much carbon deposited in
combustion chamber
5. Ignition timing too advanced
Continually drive in
acceleration or high speed
No knock
1-14
Knock
1. Too much carbon deposited in
combustion chamber
2. Lean mixture
3. Poor fuel quality
4. Lean mixture
This chapter Contents
1. GENERAL INFORMATION
C. Engine runs sluggish (especially in low speed and idling)
Check and adjustment
Fault condition
Probable causes
Check ignition timing
(using ignition lamp)
Normal
Abnormal
1. Incorrect ignition timing (malfunction
of CDI or AC generator)
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
1. Poor heat insulation gasket
Air sucked
No air sucked
2. Carburetor lock loose
3. Poor intake gasket
4. Poor carburetor O-ring
Remove spark plug, install
spark plug into spark plug
cap and perform spark test
against engine ground
1. Spark plug fouled
2. Malfunction of CDI
3. Malfunction of AC generator
Poor
Good spark
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
PROBABLE CAUSES
Check ignition timing
Normal
Abnormal
1. Malfunction of CDI
2. Malfunction of AC generator
Check for fuel supplying
system in automatic fuel cup
1. Insufficient fuel in fuel tank
Good
Poor
2. Fuel filter clogged
3. Restricted fuel tank vent
Check if carburetor clogged
Normal
Clogged
1. Cleaning
1-15
This chapter Contents
1. GENERAL INFORMATION
E. CLUTCH, DRIVING AND DRIVING PULLEY
FAULT CONDITION
PROBABLE CAUSES
1. Driving belt worn out or deformation
2. Driving disk damaged
3. Driving pulley spring broken
Engine can be started but
motorcycle can not be driving
4. Clutch ling broken
5. Driving slide-shaft gear groove broken
6. Transmission gear damage
7. Transmission gear worn out or burned
Engine running and misfire as
motorcycle initial forward moving
or jumping sudden (rear wheel
rotating as engine in running)
1. Clutch ling spring broken
2. Clutch outer cover stuck with clutch balance weights
3. Connection parts in clutch and shaft worn out or
burned
1. Driving belt worn out or deformation
Poor initial driving (Poor climbing
performance)
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.
1-16
This chapter Contents
1. GENERAL INFORMATION
Lubrication Points
Throttle cable/
Front & rear brake lever pivot
Engine suspension bushing
Seat lock
Steering shaft bearing
Speedometer gear/ front
wheel bearing
Side stand shaft
Main stand shaft
Rear wheel bearing
1-17
This chapter Contents
1. GENERAL INFORMATION
Note:
1-18
Home page
Contents
2. SERVICE MAINTENANCE INFORMATION
General Information ························· 2-1
Suspension····································· 2-10
Periodical Maintenance Schedule··· 2-2
Transmission Oil ···························· 2-11
Air Cleaner ········································ 2-3
Spark Plug ······································ 2-11
Fuel Lines ········································· 2-3
Control Cable Lubrication ············· 2-12
Fuel Filter ·········································· 2-4
Driver Belt ······································· 2-12
Engine Oil Line ································· 2-4
Ignition Timing ······························· 2-12
Oil Pump Control Cable ··················· 2-5
Throttle Valve Operation················ 2-12
Tire····················································· 2-6
Carburetor Idle Speed Adjustment 2-13
Battery··············································· 2-6
Carbon Removing For Exhaust Pipe &
Rear Brake Free Play: (Drum Brake Type) Muffle··············································· 2-13
···························································· 2-7
Cylinder Compression Pressure Test
Brake System Hose: (Front Disc Brake
Type)·················································· 2-8
2-13
Headlight Adjustment ···················· 2-14
Steering System ······························· 2-10
General Information
Specification
Model
Item
JET 50
Tire dimension
Tire pressure at cold
JET 100
Front: 120 / 70 – 12, Rear: 130 / 70 - 12
Only rider
Front: 1.75kg/cm2 Rear: 2.0 kg/cm2
Rear brake lever free play
Transmission oil / Recommendation
Spark plug / Recommendation
Driving belt width
10~20 mm
Type: HYPOID GEAR OIL
Oil: SAE #140 Quantity: 0.12 L Replacement: 0.11L
Type: NGK BR8 HSA
Plug gap: 0.6-0.7mm
Type: NGK BR6 HSA
Plug gap: 0.6-0.7mm
Standard 18.0mm
Allowable limit: replace it if below 16.5mm
Ignition timing F mark
17 °, BTDC/1500 rpm
Acceleration operation
2~6 mm
Idle speed
Cylinder compression pressure
2000 ±100 rpm
2100 ±100 rpm
7 ±1 kgf/cm²
10 ±2 kgf/cm²
2-1
2
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Periodical Maintenance Schedule
Check item
Maintenance
kilometer
300KM
Maintenance
interval
New
☆ 1. Air cleaner
Every
1000KM
Every
3000KM
Every
6000KM
Every
12000KM
1 month
3 month
6 month
1 year
I
C
☆ 2. Fuel filter
☆ 3. Engine oil filter cleaning
4. Oil pump linkage operation
☆
check
5. Tire pressure
6. Battery inspection
7. Brake & free play check
8. Steering handle check
9. Cushion operation check
10. Every screw tightening check
11. Gear oil check for leaking
☆ 12. Spark plug check or change
☆ 13. Gear oil change
14. Frame lubrication
15. Exhaust pipe
☆ 16. Carburetor
☆ 19. Emission check in Idling
☆ 20. Idle speed check
21. Fuel lines
☆ 22. Throttle operation
☆ 23. Engine bolt tightening
C
I
I
I
I
I
I
I
I
I
I
R
I
I
I
I
I
I
I
I
I
I
I
R
Replacement for every 5000km
L
I
I
I
I
I
I
I
I
I
I
I
I
I
☆ 24. Engine screw torque
☆
25. Carbon cleaning for cylinder
head, cylinder, piston head,
and exhaust system.
R
C
C
17. Driving belt check
☆ 18. Ignition timing
Reference
I
I
Have your scooter checked, adjusted periodically by your SYM Authorized Dealer to maintain the scooter at the
optimum condition
Code: I ~ Inspection, cleaning, and adjustment R ~ Replacement
C ~ Cleaning (replaced if necessary)
L ~ Lubrication
The above maintenance schedule is established by taking the monthly 1000 kilometers as a reference which
ever comes first.
Remarks:
1. Clean or replace the air cleaner element more often for pro-long engine life-span when the
scooter is operated on dusty roads or in the Heavily- polluted environment.
2. Maintenance should be performed more often if the scooter is frequently operated in high speed
and after the scooter has accumulated a higher mileage.
2-2
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Air Cleaner
Mounting screw X 7
• Remove the mounting screw from the air
cleaner cover
• Remove the air cleaner cover
Air cleaner element
Remove the air cleaner element
Clean the element with non-flammable or
high-flash point solvent and then squeeze it for
dry.
Caution
Never use gasoline or acid organized solvent
to clean the element.
Soap the element into cleaning engine oil and
then squeeze it out. Install the element onto
the element seat and then install the air cleaner
cover.
• Limit to use SAE 20 JASO FC class engine
oil, otherwise, SYM is no responsible for the
warranty.
• Recommended engine oil: MAX-2 serial oils.
Clean
Squeeze oil out
Fuel Lines
Remove the body cover
Check fuel lines and replace damaged lines if
found.
Install the body cover.
Soap
Squeeze out remaining oil
Carburetor
Fuel pump
Fuel line
2-3
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Fuel Filter
Remove the luggage box.
Remove the fuel line from the fuel filter.
Replace the fuel filter with new one.
Install the fuel filter. The arrow indicates the fuel
flowing direction.
Check the fuel line for leaking.
Fuel filter
Engine Oil Line
Remove the body cover.
Check the engine oil line and replace damaged
parts.
Remove the filling pipe from the oil pump, and
drain oil into a cleaning container.
Loosen the clamp under the engine oil tank, and
then remove the oil pipe.
Bleed the air inside the oil pump and oil pipe if
air found.
Install the body cover.
Engine oil pipe
Oil pump
Oil filling pipe
2-4
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Oil Pump Control Cable
Mounting nut
Caution
To adjust the oil pump control cable after
adjusted the throttle grip play.
Remove the body cover.
Wide open the throttle valve, and check if the
calibration point aligns on the oil pump lever with
the mark of pump body.
Loosen the adjustment nut of the oil pump
control cable.
Turn the adjustment nut and align with the point,
then tighten the nut.
Adjustment nut
2-5
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Tire
Caution
Tire pressure should be checked when cold.
Check tire for cracks, damage, nail, or other
object stuck in tread.
Recommended tire and tire pressure
Front:
Rear:
Tire size
120 / 90 - 10
130 / 90 - 10
Tire pressure
1.75
2.0
(cold) kg/cm2
Check if the tire tread and wall rubber for crack
or damage, and replace if necessary.
Check if foreign materials such as nail, metal
pieces, and stones stuck on tire.
The thread depth can be checked by visual
inspection or by a depth gauge.
• If the tread bend too much, replace the tire.
• If tire wear exceeds limitation, replace the
tire, and check it for un-even wear.
Caution
Wear indicator “△” is distributed on average
along the wall rubber for check.
Battery
Open the seat.
Loosen two screws of battery cap and then
remove the cap. Check if the battery
terminals are loosen. Remove the battery if its
terminals are corroded obviously.
Battery Removal
1.
Remove the Negative (-) battery cable at
first.
2. Then, remove the Positive (+) battery cable.
3. Remove the battery.
Clean the rust with steel brush.
Install the battery in reverse order of removal,
and apply with grease onto two terminals.
Caution
The electrolyte is contained sulfuric acid so
be careful not to let it touch to eyes, skin, or
clothes. If touched by accident, flush them
with clean water immediately. However, if
the electrolyte sprays to eyes, medical care
should be done quickly.
2-6
Wear indicator
△ Mark
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Rear Brake Free Play:
Brake Type)
(Drum
10∼20mm
(3/8∼3/4 in)
Measure the free play of the rear brake lever at
the end of the lever.
Free play: 10-20 mm (3/8-3/4 in)
Adjust the free play by turning the front brake
adjustment nut if necessary.
Adjustment nut
Brake Confirmation
Caution
After brake adjustment, it has to check the
brake operation to make sure the front and
rear wheel can be braked.
Decreasing
free play
Increasing
free play
2-7
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Brake System Hose: (Front Disc
Brake Type)
Lower limit
Make sure that the brake hose is corrosion or
damage, and also check the 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 DOT-3 to UPPER limit. Also
check brake system for leaking if low brake level
found.
Brake fluid
reservoir cap
Caution
z
In order to maintain brake fluid in the
reservoir in horizontal position, do not
remove the cap until handle bar stop.
z
Do not operate the brake lever after the cap
had been removed. Otherwise, the brake
fluid will spread out if operated the lever.
z
Do not mix non-compatible brake fluid
together.
Arrow
Brake Lining Wear: (Rear Drum Brake
Type)
Wear limit mark
Replace the brake lining if the wear limit mark
“△” on the brake arm aligning with the indicator
of brake drum.
Brake lining
Brake Lining Wear: (Front Disc Brake
Type)
The arrow 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
In order to maintain brake power balance, the
brake lining must be replaced with one set.
2-8
Brake caliper
Brake disc
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
z
z
z
z
Remove the pin bolt cap.
Loosen the bolt.
Remove the front wheel shaft bolt.
Take out the front wheel.
Pin bolt cap
Remove brake caliper mounting bolt and then
remove the brake caliper.
Caution
Mounting bolt
Do not operate the brake lever after the
clipper removed to avoid clipping the brake
lining.
Pin bolt
Pry out the brake lining with a flat driver if lining
is clipped.
Brake lining
Remove brake lining bolt.
Take out the lining.
Tighten Torque:
Mounting bolt: 2.9-3.5 kgf-m
Pin bolt: 1.5-2.0 kgf-m
Pin bolt cap: 0.8-1.2 kgf-m
Pin bolt
The brake LIGHT switch is to light up brake
LIGHT as brake applied. Replace the switch if
the light does not light up in properly.
Caution
The brake light switch is un-adjustable.
2-9
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Steering System
Caution
The control cables can not interfere with the
rotation of steering handle.
Lift the front wheel out of ground, and check if
the steering handle turning is smoothly.
If handle turning is uneven and bending, stuck,
or the handle can be operated in vertical
direction, then adjust the handle top bearing by
adjusting the steering nut.
Suspension
Warning
Do not ride the scooter with poor suspension.
Looseness, wear or damage suspension
system will make poor stability and
drive-ability.
Front Shock Absorber
Press down the front shock absorber for several
times to check it operation.
Check if the shock absorber assembly is
damage. Replace it if damage found and can
not be repaired.
Tighten all nuts and bolts.
Rear Shock Absorber
Park the scooter with its main stand.
Shake the rear wheel side to side to check
engine suspension bushing for wear.
Replace the bushing if looseness found.
Check the shock absorber for damage.
Tighten all nuts and bolts.
Nuts, Bolts Tightness
Check if all bolts and nuts on the frame are
tightened to specified torque in accord with the
interval of Periodical Maintenance Schedule.
Check all split pins, snap rings, hose clamps,
and wire holders for security.
2-10
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Transmission Oil
Leak
Check if the transmission is leak.
Oil level check bolt
Draining bolt
Check
Caution
Park the scooter on flat ground with its main
stand.
Remove the oil level check bolt, and check if the
oil level is placed on the hole of check bolt.
Replacement
Remove the oil level check bolt.
Remove the oil draining bolt, and then drain oil
out.
Install the oil draining bolt.
Tighten torque: 1.3 kg-m
Oil level check bolt hole
Caution
Check if oil seal and washer is in good
condition.
Replacement Quantity: 0.09 L (90 cc)
Recommended oil: King Bramax HYPOID
GEAR OIL #140
Spark Plug
Recommended plug: NGK BR8HSA
z
z
z
z
z
z
z
z
z
z
Remove the luggage box.
Remove the spark plug cap.
Clean any dirt on the spark plug seat.
Remove the spark plug.
Visually inspect the spark plug electrodes
for wear.
The center electrode should have square
edges and side electrode should have a
constant thickness. Replace the spark plug
if there is apparent wear or if the insulator is
cracked and/or chipped. If the spark plug
deposits can be removed by sandpaper, the
spark plug can be reused.
Measure the spark plug gap with feeler
gauge.
Spark plug gap: 0.6-0.7mm
(0.024-0.028in)
Adjust the gap by careful bending the side
electrode.
Install the spark plug by screwing it with
hands after installed the spark plug washer
so that can prevent the plug from out of
thread. Then, tighten the spark plug with a
spark plug wrench.
Install the spark plug cap.
0.6~0.7mm
Center electrode
Side electrode
2-11
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Control Cable Lubrication
Remove the throttle control and the brake cables
periodically, and lubricate the moving parts of
the cables thoroughly.
Tooth face
Belt width
Driver Belt
Remove left crankcase cover.
Check if the belt is crack or worn out.
Replace the belt if necessary.
z
Measure the driving belt width
Allowable limit: 16.5mm
z
z
Ignition Timing
Caution
z
C.D.I ignition timing can not be adjusted. If
the ignition timing is incorrect, check the
C.D.I. device and the alternator and
replace damaged components.
z
Check ignition timing with standard
instrument.
Remove the right-side cooling fan cover.
Check ignition timing with the timing light.
When engine speed setting to 1800 rpm, and if
the mark aligns with “F” mark, then it means that
the ignition timing is correct.
Throttle Valve Operation
Check if each steering positions are operated in
smooth, and handle bar if its operation is
smooth as the throttle valve wide opening or
fully closed.
Check throttle cable and replace it if deteriorated,
twisted or damaged.
Lubricate the cable if operation is not smooth
Measure throttle valve handle free play.
Free play:2~6 mm (1/8-1/4 in)
Loosen the mounting nut, and turn the free play
adjustment nut of the throttle valve handle for
adjustment.
Replace the cable if it can not be adjusted.
2-12
Ignition lamp
“F” mark
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Carburetor Idle Speed Adjustment
Pilot screw
Caution
z
Inspection & adjustment for idle speed
have to be performed after all parts in
engine had been adjusted in specification.
z
Idle speed check and adjustment have to
be done after engine is being warn up. It
around operates engine from stop to
running for 10 minutes.
Idle speed adjustment screw
Remove the body cover.
Park the scooter with main stand after warned
up engine. According to the required idling and
air screw to adjust to specified idle speed.
Idle speed: 2000±100 rpm (JET 50)
Idle speed: 2100±100 rpm (JET 100)
Carbon Removing For Exhaust
Pipe & Muffle
Adjust the idling after warn up engine for 10
minutes.
1. Connect tachometer.
2. Adjust the idle speed screw to let engine
speed in 2000±100 rpm.
3. Insert the sampling pipe of the CO/HC meter
to the test hole on the front end of exhaust
pipe. Adjust the idling emission value to
standard range. (CO: 1.8-2.6%)
4. Slightly accelerate the throttle valve and
release it. Repeat this operation for 1-2
times.
5. Read the engine idle speed and the emission
value after engine speed in stable. Repeat
the operation on step No. 2 – No. 4. until
these value within standard range.
Compression pressure gauge
Remove the body cover.
Remove the exhaust pipe & muffler.
Clean the carbon deposits on the muffler &
cylinder exhaust edge.
Cylinder Compression Pressure
Test
Remove the left body cover, and warn up engine.
Stop the engine and remove the spark plug.
Insert the compression gauge and wide open
the throttle, and then rotate the engine by means
of the starting motor.
Compression pressure: 7.0±1 kg/cm2
Probable causes for low compression pressure.
z Damaged cylinder head gasket.
z Worn piston ring
z Worn cylinder
Probable causes for high compression pressure.
z Carbon on the combustion chamber or
cylinder head
2-13
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Headlight Adjustment
JET Euro
Loosen headlight mounting bolt.
Move the headlight for adjustment its light beam.
Tighten the headlight mounting bolt after
adjusted.
Caution
Improper headlight beam adjustment will
make in coming driver dazzled or insufficient
lighting for safety distance.
Headlight mounting bolt
JET
Headlight mounting bolt
2-14
Home page
Contents
3. LUBRICATION SYSTEM
Lubrication System Diagram············ 3-1
Oil Pump Removal ···························· 3-3
Precautions In Operation·················· 3-2
Oil Pump Installation ························ 3-3
Lubricant············································ 3-2
Oil Pump/Oil Tube Air Bleeding······· 3-4
Trouble Shooting······························· 3-2
Oil Tank ············································· 3-5
3
Lubrication System Diagram
Oil lever switch
Oil tank
Oil tube
Oil output tube
Oil pump
3-1
This chapter Contents
3. LUBRICATION SYSTEM
Precautions In Operation
z
z
z
z
Be careful not let dirt enter into engine or oil hoses when removing or installing the oil pump.
If air is found in the oil tube (from oil tank to oil pump) or oil tube is removed, the oil pump should
be conducted air-bleeding operation.
It should bleed the oil output tube (from oil pump to carburetor) as hose removed.
The adjustment of oil pump control cable.
Lubricant
z
z
z
Appointed to apply SAE 20 JASO FC class oil. Otherwise, warranty shall not cover the damage.
Recommended Oil: MAX-2 oil.
Oil tank capacity: 1.2 lit.
Trouble Shooting
Too much smoke, carbon in spark plug.
1. Improperly oil pump adjustment (too much oil).
2. Poor quality oil.
3. Applying with poor quality oil.
Over heat
1. Improperly oil pump adjustment (insufficient oil).
2. Poor quality oil.
3. Applying with poor quality oil.
Piston seized
1.
2.
3.
4.
No oil in oil tank or clogged hose.
Improperly oil pump adjustment (insufficient oil).
Air in oil hose.
Malfunction of oil pump.
Oil did not flow out the oil tank
1. Clogged breath hole on the oil tank cover.
3-2
This chapter Contents
3. LUBRICATION SYSTEM
Oil Pump Removal
Oil tube
Oil output tube
Caution
Before removing the oil pump, clean the oil
pump and crankcase.
Remove the luggage box and seat.
Loosen the mounting nut of the oil pump control
cable, and remove the control cable.
Remove the oil tube, and clip its end side to
prevent oil from flowing out.
Control cable
Mounting nut
Adjustment nut
Remove the oil output tube form intake manifold.
Remove the oil pump mounting bolt, and then
take out the oil pump.
Inspection
Inspect the following items on the removed oil
pump.
z Check if O-ring is damaged or softening.
z Check if crankcase interface is damaged.
z Check if pump body is damaged.
z Check if pump gear is damaged.
z Check for oil leaking.
Oil output tube
Caution
The oil pump can not be disassembled.
Oil Pump Installation
Install the oil pump onto the crankcase.
Caution
z
z
Apply with some grease onto oil pump
O-ring.
The connection between both oil pump and
crankcase has to be installed in position
security.
Tighten the oil pump mounting bolt security.
Install the oil tube.
Installation in the reverse order of removal.
Caution
Inspection and adjustment following items as
installed.
The adjustment operation of control cable.
Air bleeding operation of oil pump.
Air bleeding operation of oil tube.
Check each section for leaking.
3-3
This chapter Contents
3. LUBRICATION SYSTEM
Oil Pump/Oil Tube Air Bleeding
Oil tube
Caution
The oil tube system has to be conducted air
bleeding operation because air will clog or
restraint oil flowing so that cause serious
engine damage.
Oil output tube
Caution
After disconnect the oil tube, air enters oil
tube due to oil leak out without added oil.
There is why the oil tube and oil pump have to
conduct air bleeding operation.
Control cable
Oil Tube/Oil Pump
z
z
z
z
z
z
It has to add some oil into the oil tank.
Place a piece of dry cloth around the oil
pump.
Disconnect the oil tube.
Fill out oil to oil pump connection section by
means of the oil pot so that the oil pump body
is full with oil.
Fill out oil to oil tube connection section so
that the oil tube is full with oil. Then, install
the tube onto oil pump.
Make sure whether air is in the oil tube or not
after installation.
Caution
Oil tube
Oil output tube
After bleeding the oil tube and oil pump, the
oil tube has to be conducted air bleeding
operation too.
Oil Tube Air Bleeding
Remove the oil output tube and plug its input
connector. Bend the oil tube into “U “shape,
and fill out new oil into the output tube.
Connect the oil output tube to the oil pump
connection part.
Start engine, and run it in idling as the oil control
lever in wide open position. Make sure oil flows
out from the oil output tube.
Caution
z
z
Motorcycle’s exhaust gas includes with CO
which causes human to coma or death so
perform this operation in well-ventilation
place.
Run the engine in extreme low speed to
avoid to damaging the engine caused from
clogged oil tube.
3-4
Recommended oil
This chapter Contents
3. LUBRICATION SYSTEM
Oil Tank
Mounting bolt
Removal/Installation
Remove the luggage box and seat.
Remove the battery and battery box.
Remove the R/L. side cover, rear center cover,
rear carrier and body cover.
Remove the rear fender.
Remove the oil input tube from oil pump, and
then drain oil to a clean container.
Remove the oil switch wire of the oil indicator.
Blot ×2
Screw ×2
Remove the mounting bolt on the oil tank upper
side, and then remove the oil tank.
Installation in the reverse order of removal.
Air bleeding the oil tubes after installation.
Blot ×1
3-5
This chapter Contents
3. LUBRICATION SYSTEM
NOTES:
3-6
Home page
Contents
4. ENGINE REMOVAL
Maintenance Information ················ 4-1
Engine installation···························· 4-4
Engine removal ································ 4-2
Maintenance Information
There are parts that require removal of engine for maintenance.
z Crankcase
z Crankshaft
4
Related bolts tightening torque for removal of engine:
Engine hanger bolt
5.0kgf-m
Engine bracket bolt
6.0kgf-m
Rear shock absorber upper mounting bolts
4.0kgf-m
Rear shock absorber lower mounting bolts
2.7kgf-m
Exhaust pipe connection nut
1.2kgf-m
Muffle mounting bolt
3.3kgf-m
4-1
This chapter Contents
4. ENGINE REMOVAL
Engine removal
Spark plug
Remove body cover.
Remove the spark plug cap from the spark plug
section.
Fuel output tube
Remove the fuel output and the vacuum tubes
from fuel pump.
Remove the oil control cable from oil pump.
Remove the oil tube from oil pump and then clip
the tube.
Vacuum tube
Remove the wire connectors of auto by starter
and ACG.
Remove the upper part of the carburetor from its
upper side.
Remove the vapor emission vacuum tube from
carburetor intake manifold.
4-2
Fuel pump
Oil tube
Oil control cable
Wire connector
This chapter Contents
4. ENGINE REMOVAL
Remove rear brake cable from engine rear-lower
side.
Brake cable
Remove air cleaner mounting bolts. (2 bolts)
Mounting bolt
Support the engine and then remove shock
absorber lower mounting bolt.
Shock absorber lower
mounting bolt
Remove two exhaust pipe connection nuts.
Remove two bolts beside fan cover and exhaust
pipe.
Connection nut
Exhaust pipe
Bolt
4-3
This chapter Contents
4. ENGINE REMOVAL
Remove engine mounting nut and bolt.
Engine mounting bolt
Engine installation
Install in the reverse order of removal
procedures.
Tighten the engine mounting and rear shock
absorber upper/lower bolts.
Torque value:
Engine hanger bolt:
Rear shock absorber upper
mounting bolts:
Rear shock absorber lower
mounting bolts:
Exhaust pipe connection nut:
Muffle mounting bolt:
5.0kgf-m
4.0kgf-m
2.7kgf-m
1.2kgf-m
3.3kgf-m
Perform the following inspection and adjustment
after installation.
z Check if control cable is correct.
z Check if throttle valve cable is correct.
z Check if oil pump control cable is correct.
z Oil input and output of the oil pump.
z Adjust rear brake.
4-4
Home page
Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Maintenance Information·················· 5-2
Cylinder Head ·····································5-3
Troubleshooting································ 5-2
Cylinder/Piston···································5-5
5
5-1
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Maintenance Information
Precautions In Operation
z
z
z
z
z
The inspection and maintenance of the cylinder head, cylinder and piston can be carried as
engine mounted on the body.
It should clean the engine to prevent dirt from entering into cylinder and crankcase before
removal.
Remove all washes from the interfaces of cylinder head, cylinder and crankcase.
Be careful do not damage cylinder head, cylinder and piston when removing.
Inspect the removed & cleaned parts thoroughly, and apply with oil onto the rotation surfaces
before installation.
Specification
Item
Cylinder
Deformation
head
Piston OD
Clearance between
cylinder and piston
Piston pin hole
Piston pin OD
Piston
Clearance between
piston and piston pin
Piston ring end gap
ID of connecting rod
small end
ID
Cylinder
Deformation
ID: inner diameter
OD: outer diameter
JET 50 series
Standard value
Limit (mm)
(mm)
JET 100 series
Standard value
Limit (mm)
(mm)
-
0.100
-
0.100
39.030~39.045
38.935
51.030~39.045
50.935
0.040~0.050
0.100
0.040~0.050
0.100
12.002~12.008
11.994~12.000
12.030
11.970
14.002~14.008
13.994~14.000
14.030
13.970
0.002~0.014
0.030
0.002~0.014
0.030
0.100~0.250
0.400
0.100~0.250
0.400
17.05~17.015
17.025
17.05~17.015
17.025
39.000~39.015
-
39.050
0.100
51.000~51.015
-
51.050
0.100
Tighten torque value
Cylinder head
Spark plug
1.0 kgf-m
1.4 kgf-m
Exhaust pipe connection nut
Exhaust muffler mounting bolt
1.2 kgf-m
3.3 kgf-m
Troubleshooting
Compression Pressure Too Low/Difficult
To Start/Rough Idling
1.
2.
3.
4.
5.
Cylinder head gasket leaking
Spark plug not tighten enough
Worn, seized or crack piston ring
Damaged, worn cylinder or piston
Poor reed
Compression Pressure Too
High/Overheat/Knock
1. Too much carbon deposit built up in
combustion chamber
5-2
Piston Noise
1. cylinder and piston worn out
2. piston pin or piston pin hole worn out
3. connecting rod small end bearing worn out
Piston Ring Noise
1. Worn, seized or crack piston ring
2. Cylinder worn out or damaged
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Tightening bolt
Cylinder Head
Cylinder Removal
Removal body covers.
Remove spark plug cap.
Remove fan cover.
Remove engine shield.
Tightening bolt
Engine shield
Remove two connection nuts of the exhaust
pipe.
Remove exhaust muffle mounting bolt, and then
remove the exhaust pipe.
Tightening bolt x 2
Muffle
Cylinder Head Removal
Bolt x 2
Tightening bolts
Remove the 4 cylinder head bolts and then
remove the cylinder head.
Caution
Loosen the cylinder head bolts with diagonal
direction to avoid to damaging it.
Cleaning Carbon In Combustion
Chamber
Clean carbon deposit in which built up in
combustion chamber with shown chisel.
Caution
Do not scratch to the interfaces of combustion
chamber and cylinder.
Chisel
5-3
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Cylinder Head Inspection
Use a straight edge and a feeler gauge to
measure the cylinder head for warp.
Service limit: 0.10 mm
Cylinder Head Installation
Tightening bolts
Replace the cylinder head gasket with new one,
and place the cylinder head onto cylinder.
Tighten the 4 bolts with diagonal direction and
by 2-3 sequences.
Tighten torque: 1.0 kgf-m
Install spark plug
Tighten torque: 1.4 kgf-m
Replace the exhaust pipe washer with new one
and then install exhaust pipe.
Tighten exhaust pipe connection nut.
Tighten torque: 1.2 kgf-m
Tighten exhaust pipe mounting bolt.
Tighten torque: 3.3 kgf-m
Install the removed parts in the reverse order of
removal procedures.
Inspect following item after installation.
Compression pressure test.
Check for engine noise.
Tightening bolt x 2
Muffle
5-4
Bolt x 2
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Cylinder/Piston
Cylinder Removal
Be careful to pull the cylinder up and prevent
piston from damage.
Caution
Do not have pry out operation between
cylinder and crankcase. Or let radiation fan
be knocked seriously.
Piston Removal
Place a clean rag onto crankshaft to cover the
piston.
Remove piston pin clip (one piece) and then
push piston pin out the piston.
Piston
Caution
y Do not damage or scratch the piston.
y Do not apply with lateral force to
connecting rod.
y Do not let piston pin snap ring falling into
crankcase.
Piston pin clip
Piston pin
Piston Ring Removal
Caution
Pry out the opening end of each piston ring
and then remove the ring from piston.
Check if cylinder and piston are worn or
damaged, and then clean carbon deposit on
exhaust opening area as the diagram shown.
Caution
Do not scratch both the cylinder and the
piston.
5-5
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Use a straight edge and a feeler gauge to
measure the cylinder head for warp.
Service limit: 0.10 mm
In “X” and “Y” direction, measure the cylinder for
worn out as the three levels shown in the figure.
With the max. value to decide cylinder wear out
condition.
Service limit
JET 50 : 39.050mm
JET 100 : 51.050mm
Measure the OD of piston at the 7 mm from the
bottom of the piston.
Service limit
JET 50 : 38.935 mm
JET 100 : 50.935 mm
Calculate the clearance between piston and
cylinder.
Service limit: 0.100 mm
Measure the ID of piston pin hole.
Service limit
JET 50 : 12.030mm
JET 100 : 14.030 mm
Measure the OD of piston pin.
Service limit
JET 50 : 11.970 mm
JET 100 : 13.970 mm
5-6
7mm
The ID of piston pin hole
The OD of piston pin
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Piston Ring Inspection
Measure the end gap of each piston ring.
Service limit: 0.40 mm
Caution
With the piston, push each piston ring into
cylinder correctly.
Connecting Rod Inspection
Install bearing and piston pin onto connecting
rod small end, and then check its clearance.
Measure the ID of connecting rod small end.
Service limit: 17.025mm
Clearance
Piston/Cylinder Installation
Install the expanding ring into the groove of 2nd
ring.
Align the ring end with the lock pin in the ring
groove.
Install the top ring and the 2nd ring onto the ring
groove respective.
Top ring
2
ring
Piston ring mark
Caution
The top ring and the 2nd ring can not be
changeable each other.
nd
Expanding ring
1T: top ring
nd
2T: 2 ring
Push the rings into ring groove and then check
rings’ mating condition.
If ring could not be push in the ring groove, it
means that ring groove is dirty or wrong ring
groove installation.
Caution
y All rings should be installed with the marks
facing up.
y All ring should be replaced at same time,
and it can not be replaced one ring only.
y It should use same brand name piston ring
in an engine and can not mix with other
one.
5-7
This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Place a cleaning cloth onto the crankcase
opening to prevent the piston pin snap ring from
falling into the crankcase.
Apply with two-stroke engine oil onto needle
bearing and piston pin, and then install the
piston pin onto connecting rod. Install piston,
and place “EX” mark of the piston toward to
exhaust side.
Install new piston pin snap ring.
Piston
〝EX〞mark
Piston pin
Piston pin snap ring
Clean all gaskets onto the interfaces of cylinder
and crankcase.
Place a new gasket onto the crankcase.
Make sure that the piston ring aligns with the
lock pin in piston ring groove.
Caution
Make sure that all rings in the piston ring
groove can not be rotated around the lock pin
to avoid to damaging the rings, piston and
cylinder.
Lock pin
Lubricate cylinder and piston with two-stroke
engine oil. Hold the piston and then install it
into cylinder.
Caution
To avoid to damaging the piston and the
cylinder sliding surface.
Install the cylinder head.
5-8
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Contents
6. ALTERNATOR
Maintenance Information ················ 6-2
Alternator Installation······················· 6-4
Alternator Removal·························· 6-3
6
3.8 kgf-m
6-1
This chapter Contents
6. ALTERNATOR
Maintenance Information
Precautions in Operation
z
z
The maintenance service of A.C. alternator can be carried out directly on the motorcycle.
Please refer to Chapter 15 for the relative alternator inspection.
Torque value:
Flywheel
3.8 kgf-m
Tool
General tool
Rotor puller
Universal holder
Coil resistance value for the A.C. alternator
JET 50/100 series
Earth
Y/L
Y
W
R/B
50~200Ω
0.2~0.8Ω
0.2~1.0Ω
400~800Ω
JET EURO 50/100 series
Y/L
Earth
Y
Y
50~200Ω
0.4~0.8Ω
L/Y
Y
Y
Y
AC.G
6-2
3P
Earth
This chapter Contents
6. ALTERNATOR
Alternator Removal
Cooling fan cover
Remove the body cover.
Remove two bolts and then take out cooling fan
cover.
Bolt
Remove four bolts, and then take out the cooling
fan.
Cooling fan
10mm flanged nut
Hold flywheel with universal holder.
Support the flywheel and the remove the 10 mm
nut on the flywheel.
Universal holder
Remove the flywheel with rotor puller.
Rotor puller
6-3
This chapter Contents
6. ALTERNATOR
Disconnect alternator wire connector and pulse
generator connector.
Wire harness connector
Remove the pulse generator and alternator four
(4) bolts, and then take out the alternator
assembly.
Caution
Care to be taken for not damaging the
alternator coil.
10mm flanged nut
Alternator Installation
Install the alternator assembly.
Connect the alternator connector.
Caution
Connect the alternator wire harness properly
and then clip the harness with clipper.
Install the woodruff key onto the crankshaft
groove.
Caution
z
z
Clean dirt and metal pieces inside the
flywheel.
Make sure that there is no foreign material
inside the flywheel.
Install the flywheel
Tighten the flywheel 10 mm nut.
Torque value: 3.8 kgf-m
Install the removed parts in reverse order of
removal procedures.
Start engine and check its ignition timing.
6-4
Universal holder
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Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Maintenance Information ················ 7-2
Drive Belt··········································· 7-5
Trouble Shooting ····························· 7-2
Movable Driven Pulley ····················· 7-6
Left Crankcase Cover ······················ 7-3
Clutch/Driven Pulley························· 7-10
Reassembly Of Kick Starter ············ 7-4
Installation Of The Left Crankcase
Cover················································· 7-4
5.5 kgf-m
7
3.8 kgf-m
3.8 kgf-m
7-1
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Maintenance Information
Precautions In Operation
The surfaces of drive belt and driven pulley must be free of grease.
Specification
Item
Standard value(mm)
Limit(mm)
18.0
16.5
ID of movable drive face
20.035~20.085
20.120
OD of movable drive face boss
23.964~23.985
23.918
OD of weight roller
15.92~16.08
15.40
ID of clutch outer
107.0~107.2
107.5
4.0~4.1
2.0
87.9
82.5
33.965~33.985
33.940
33.000
34.060
Drive belt width
Thickness of clutch weight
Free length of driven pulley spring
OD of driven pulley
ID of movable driven face
ID: Inner Diameter
OD: Outer diameter
Torque Values:
Special Service Tools
Movable drive face: 3.8 kgf-m
Driven pulley: 5.5 kgf-m
Clutch outer: 3.8 kgf-m
Clutch spring compressor
Bearing driver
Clutch nut wrench 39x41 mm
Bearing driver accessory 39x41 mm
Universal holder
Driver
Trouble Shooting
Engine can be started but motorcycle
can not be moved
Insufficient horsepower or poor high
speed performance
1.
2.
3.
4.
1.
2.
3.
4.
Worn drive Belt
Worn ramp plate
Worn or damaged clutch weight
Broken driven pulley spring
Shudder or misfire when drive
1.
2.
Broken clutch weight
Worn clutch weight
7-2
Worn drive belt
Insufficient spring capacity of driven pulley
Worn weight roller
Driven pulley operation un-smoothly
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Left crankcase cover
Left Crankcase Cover
Left crankcase cover removal
Remove left body side cover.
Remove air cleaner.
Remove kick start arm.
Remove left crankcase cover.
Kick start arm
Disassembly of Kick Starter
Return spring
Remove snap clip and thrust washer from left
crankcase cover.
Install kick start arm, rotate the lever slightly and
then remove driven gear and washer.
Remove the kick starter arm, kick starter spindle,
and return spring as well as socket.
Driven gear
Starter spindle
Inspection of kick Starter
Check if starter spindle, driven gear for wear or damage.
Bolt
Kick start arm
Snap ring
Thrust washer
Return spring
Bush
Thrust washer
Driven gear
Starter spindle
Friction spring
7-3
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Reassembly Of Kick Starter
Kick starter spindle
Install bush, return spring and starter spindle as
diagram shown.
Install thrust washer and snap clip onto starter
spindle.
Install Kick starter lever temporary.
Slightly rotate the lever and then align driven
gear with width-tooth on the starter spindle.
Install the friction spring of drive gear onto
convex part of the cover.
Return spring
Width-tooth
Convex part
Installation Of The Left Crankcase
Cover
Install the dowel pin and gasket.
Install the left crankcase cover.
Install kick start arm.
7-4
Dowel pin
Driven gear
Friction spring
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Drive Belt
Nut
Removal
Remove left crankcase cover.
Hold clutch outer with universal holder, and
remove nut and clutch outer.
Caution
y Using special tools for tightening or
loosening the nut.
y Fixed rear wheel or rear brake will damage
reduction gear system.
Push the drive belt into belt groove as diagram
shown so that the belt can be loosened, and
then remove the driven pulley.
Remove driven pulley/clutch. Do not remove
drive belt.
Remove the drive belt from the groove of driven
pulley.
Universal holder
Clutch/drive belt
Inspection
Check the drive belt for crack or wear. Replace
it if necessary.
Measure the width of drive belt as diagram
shown.
Service Limit: 16.5 mm
Replace the belt if exceeds the service limit.
Belt tooth
Caution
y Using the genuine parts for replacement
y The surfaces of drive belt or pulley must be
free of grease.
y Clean up all grease or dirt before
installation.
Installation
Movable driven
pulley
Caution
y Pull out driven pulley to avoid it closing.
Install drive belt onto driven pulley.
7-5
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Install the driven pulley that has installed the belt
onto drive shaft.
Drive face
Drive belt
Drive shaft
Clutch/driven pulley
Install the clutch with universal holder, and then
tighten nut to specified torque value.
Torque value: 3.8 kgf-m
Clutch outer
Nut
Universal holder
Movable Drive Face
Removal
Universal holder
Remove left crankcase cover.
Hold generator flywheel with universal holder,
and then remove drive face nut.
Flywheel
Remove drive face.
Nut
Drive face
7-6
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Removal
Drive face boss
Movable drive face
Remove movable drive face set and drive belt
from crankshaft.
Crankshaft
Remove ramp plate.
Remove weight rollers from movable face.
Ramp plate
Movable drive face
Weight roller
Inspection
The weight roller is to press movable driven face
by means of centrifuge force. Thus, if weight
rollers are worn out or damage, the centrifuge
force will be affected.
Check if rollers are wear out or damage.
Replace it if necessary.
Measure each roller’s outer diameter. Replace it
if exceed the service limit.
Service limit: 15.40 mm
Weight roller
7-7
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Check if movable drive face boss is worn or
damage and replace it if necessary.
Measure the outer diameter of drive face boss,
and replace it if it exceed service limit.
Service limit: 19.98 mm
Measure the inner diameter of drive face, and
replace it if it exceed service limit.
Service limit: 20.120 mm
Movable drive face
Drive face boss
Reassembly / Installation
Weight roller
Install weight rollers.
Install ramp plate.
Apply with grease 4~5g to inside of movable
drive face, and install drive face boss.
Caution
y The drive face has to be free of grease.
Clean it with cleaning solvent.
7-8
Ramp plate
Drive face
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Install movable drive face assembly onto
crankshaft.
Drive face boss
Movable drive face
Crankshaft
Drive Face Installation
Press down
Drive belt
Press drive belt into pulley groove, and then pull
the belt on to crank shaft.
Install drive face, washer and nut.
Universal holder
Caution
y Make sure that two sides of drive face have
to be free of grease. Clean it with cleaning
solvent.
Hold flywheel with universal holder.
Flywheel
Tighten nut to specified torque.
Torque value: 3.5-4.0 kgf-m
Install left crankcase cover.
Nut
Drive face
7-9
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Clutch/Driven Pulley
Clutch nut
wrench
Disassembly
Remove drive 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
y Do not press the compressor too much.
Clutch spring
compressor
Hold the clutch spring compressor onto bench
vise, and then remove mounting nut with clutch
nut wrench.
Release the clutch spring compressor and
remove clutch and spring from driven pulley.
Remove socket from sliding pulley.
Remove guide pin, guide pin roller, and driven
pulley, and then remove O-ring & oil seal seat
from sliding pulley.
Socket
Sliding pulley
Oil seal
Guide pin
or
Guide pin roller
O-ring
Inspection
Clutch outer
Measure the inner diameter of clutch outer
friction face. Replace clutch outer if exceed
service limit.
Service limit: 107.5 mm
Inner
diameter
Clutch outer
7-10
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Clutch weight
Clutch weight
Measure each clutch weight thickness.
Replace it if exceeds service limit.
Service limit: 2.0 mm
Driven pulley spring
Measure the length of driven pulley spring.
Replace it if exceeds service limit.
Service limit: 82.5 mm
Free length
Driven pulley
Check following items:
y If both surfaces are damage or wear.
y If guide pin groove is damage or wear.
Replace damaged or worn components.
Measure the outer diameter of driven pulley and
the inner diameter of sliding pulley. Replace it
if exceeds service limit.
Service limit: Outer diameter 33.94 mm
Inner diameter 34.06 mm
Driven pulley
Driven Pulley Bearing Inspection
Sliding pulley
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. Check if the bearing outer parts are
closed and fixed. Replace it if necessary.
Guide pin groove
Needle bearing
Caution
y Some of models are equipped with two ball
bearings.
Outer ball bearing
7-11
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Clutch Block Replacement
Spring
Remove clip and washer, and then remove
clutch weight and spring from drive plate.
Drive plate
Caution
y Some of models are equipped with one
mounting plate instead of 3 snap clips.
Check if spring is damage or insufficient
elasticity.
Snap clip
Clutch weight
Check if shock absorption rubber is damage or
deformation. Replace it if necessary.
Apply with grease onto lock pins.
Install new clutch weight onto lock pin and then
push to specific location.
Apply with grease onto lock pins. But, the
clutch weight should not be greased. If so,
replace it.
Shock absorption
rubber
Shock absorption rubber
Caution
y Grease or lubricant will damage the clutch
weight and affect the weight’s connection
capacity.
Clutch block
Install the spring into groove with pliers.
Spring
7-12
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Install snap clip and mounting plate onto lock
pin.
Snap clip
Replacement of Driven Pulley Bearing
Remove inner bearing.
Outer bearing
Clip
Caution
y If the inner bearing equipped with oil seal
on side in the driven pulley, then remove
the oil seal firstly.
y If the pulley equipped with ball bearing, it
has to remove snap clip and then the
bearing.
Inner ball bearing
Snap clip
Remove snap clip and then push bearing
forward to other side of inner bearing.
Inner needle bearing
Place new bearing onto proper position and its
sealing end should be forwarded to outside.
Apply with specified grease.
Specified grease
Snap ring
Outer bearing
Sealing end
Install new inner bearing.
Caution
Inner bearing
Sealing end
y Its sealing end should be forwarded to
outside as bearing installation.
y Install needle bearing with hydraulic
presser. Install ball bearing by means of
hydraulic presser or driver.
Install snap clip into the groove of drive face.
Align oil seal lip with bearing, and then install the
new oil seal (if necessary).
7-13
This chapter Contents
7. “V” TYPE BELT DRIVE SYSTEM/KICK-STARTER
Installation of Clutch/Driven Pulley
Assembly
Oil seal
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.
Sliding pulley
Oil seal
Guide pin
or
Guide pin roller
Guide pin
O-ring
Install socket.
Socket
Install driven pulley, 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 clutch
nut wrench.
Remove the clutch spring compressor.
Torque value: 5.0~6.0 kgf-m
Install clutch/driven pulley and drive belt onto
drive shaft.
Mounting nut
Clutch nut
wrench
Clutch spring
compressor
7-14
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Contents
8. FINAL DRIVING MECHANISM
Maintenance Information ················· 8-2
Troubleshooting ······························· 8-2
Disassembly of Final Driving
Mechanism········································ 8-3
Inspection of Final Driving Mechanism
···························································· 8-4
Bearing Replacement ······················· 8-4
Re-Assembly of Final Driving
Mechanism ········································ 8-4
8
8-1
This chapter Contents
8. FINAL DRIVING MECHANISM
Maintenance Information
Limited usage of gear oil:gear oil #140
Recommended oil:Bramax serial oil.
Oil quantity:120 c.c. (110 c.c. as replacement)
Special tools:
Inner type bearing puller (SYM-6204020)
Outer type bearing puller (SYM-6204010)
Final shaft oil seal installer (SYM-9125500)
Drive shaft oil seal installer (SYM-9120200)
Bearing driver 6204 (SYM-9110400)
Bearing driver 6201 (SYM-9610001)
Bearing driver 6203/6004UZ (SYM-9620000)
L. crank puller (SYM-1130000-L)
L. crank shaft install bush (SYM-1130010)
Troubleshooting
Trouble Diagnosis
Engine can be started but scooter can not be moved.
1.
2.
Damaged drive gear
Burnt out or seized drive gear
Noise
1.
2.
Seized, worn or damage gear
Worn or loose bearing
Gear oil leaks
1.
2.
Excessive gear oil.
Worn or damage oil seal
8-2
This chapter Contents
8. FINAL DRIVING MECHANISM
Disassembly of Final Driving
Mechanism
Oil filling hole
Remove driven pulley
Drain gear oil out from gearbox.
Remove rear wheel.
Remove gearbox cover mounting bolts from the
clutch side and then remove the cover from the
rear wheel side.
Oil draining hole
Remove final gear, final shaft and counter gear,
counter shaft.
Final gear & shaft
Counter gear & shaft
Remove the drive shaft from left crankcase.
Drive shaft
Caution
y The bearing must be replaced when
removing the drive shaft.
Remove drive shaft oil seal and bearing from left
crankcase.
Oil seal
Bearing
8-3
This chapter Contents
8. FINAL DRIVING MECHANISM
Inspection Of Final Driving
Mechanism
Check if the drive shaft, counter shaft and final
gear shaft are worn or damage.
Check if the gear box cover bearing, oil seal and
the inner diameter of counter shaft are worn or
damage.
Check if the left crankcase cover bearing, oil
seal and the inner diameter of countershaft are
worn or damage.
Final driven gear & shaft
Countershaft
Drive shaft
Bearing Replacement
Caution
y Never install used bearings. Once bearing
removed, it has to be replaced with new
one.
Remove gear box bearing from left crankcase
and gear box cover using following tools:
Special tool:
Inner type bearing puller
Re-Assembly Of Final Driving
Mechanism
Re-assemble the gearbox cover and left
crankcase with special tools:
Driver
Special tool:
Gear Box Cover
Final shaft bearing:
Bearing driver 6203/6004UZ (SYM-9620000)
Bearing driver 6201 (SYM-9610001)
Final shaft oil seal installer (SYM-9125500)
Punch guide
Adapter
Left Crankcase
Drive shaft bearing:
Bearing driver 6203/6004UZ (SYM-9620000)
Bearing driver 6201 (SYM-9610001)
L. crank puller (SYM-1130000-L)
L. crank shaft install bush (SYM-1130010)
Drive shaft oil seal installer (SYM-9120200)
With the special service tools to install drive
shaft by through the bearing.
Install a new drive shaft oil seal.
Install a new final shaft oil seal.
8-4
Drive shaft
This chapter Contents
8. FINAL DRIVING MECHANISM
Install countershaft, final driven gear and thrust
washer.
Final driven gear & shaft
Counter gear & shaft
Install new gasket and lock pin.
Install gearbox cover.
Install clutch/driven pulley assembly.
Install driven pulley, drive belt, and left
crankcase side cover.
Install body cover.
Install rear wheel.
Fill out specified oil quantity into gearbox.
8-5
This chapter Contents
8. FINAL DRIVING MECHANISM
Notes:
8-6
Home page
Contents
9. CRANKCASE/CRANKSHAFT
Maintenance Information····················9-2
Crankshaft Removal ···························· 9-3
Troubleshooting··································9-2
Crankshaft Inspection ························· 9-4
Crankcase Disassembly ·····················9-3
Crankcase Installation························· 9-5
1.0 kgf-m
Apply liquid gasket
9
9-1
This chapter Contents
9. CRANKCASE/CRANKSHAFT
Maintenance Information
z
z
z
z
This chapter concerns disassembly of the crankcase for repair purpose.
Before disassembling crankcase, except removing engine firstly, following components must be
removed too.
• Carburetor (chapter 10)
• Oil pump (chapter 3)
• Reed valve (chapter 10)
• Driving belt (chapter 7)
• Alternator (chapter 6)
• Cylinder head/cylinder/piston (chapter 5)
Except above components are needed be removed, when disassembling L crankcase, following
components must be removed too.
• Final driving mechanism (chapter 8)
When assembling both crankcase and crankshaft, it has press the inner ring edge of the
crankshaft bearing to push the crankshaft into the crankcase hole by using the specified service
tools. The old bearing onto the crankshaft has to be removed. Then install a new bearing onto the
crankshaft on the crankcase side. Oil seal has to be replaced with new one after assembled the
crankcase.
Item
Lateral clearance of the big end of the connecting rod
Radial clearance of the big end of the connecting rod
Crankshaft run-out point A
Crankshaft run-out point B
Special Tools
Crankcase disassemble tool (SYM-1120100-G5)
Outer bearing puller (SYM-6204010)
R. Crank shaft puller (SYM-1130000-R)
R. Crank shaft install bush (SYM-1130020)
L. Crank shaft puller (SYM-1130000-L)
L. Crank shaft install bush (SYM-1130010)
20*32*6 Oil seal driver (SYM-9120200)
Bearing driver 6204 (SYM-9110400)
Troubleshooting
Engine noise
1. Worn bearing of connecting rod bog end
2. Bend connecting rod
3. Worn crankshaft bearing
9-2
Standard
─
─
─
─
Limit (mm)
0.60
0.04
0.10
0.10
This chapter Contents
9. CRANKCASE/CRANKSHAFT
Crankcase Disassembly
Remove the crankcase bolts.
Bolts
Install the crankcase puller onto the right
crankcase with two (2) bolts, 6mm, as the
diagram shown.
Disassemble the right crankcase.
Crankcase puller
Right crankcase
Crankcase puller
Crankshaft Removal
As the diagram show with 3 special bolts to
install the specified service tool onto the left
crankcase.
Remove the crankcase.
Caution
Do not use iron hammer to knock out the
crankshaft.
Left crankcase
Remove crankshaft bearing with bearing puller.
Remove the right and left side oil seals.
Caution
Replace the oil seal with new one as
removing the crankshaft.
Shaft protection collar
Outer bearing puller
9-3
This chapter Contents
9. CRANKCASE/CRANKSHAFT
Crankshaft Inspection
Measure the clearance of connecting rod big
end.
Service limit: 0.60 mm
Measure the radial clearance of connecting rod
big end at X-Y directions as diagram show.
Service limit: 0.04 mm
Place the crankshaft on a V-block, measure
run-out points A and B of the crankshaft with dial
gauge.
Service limit: A: 0.10 mm
B: 0.10 mm
B
A
70mm
37mm
Check the crankshaft bearing by means of
turning it with hand. If any noise and bigger
clearance are detected, replace the bearing with
new one.
Clearance
Clearance
Lateral
9-4
Radial
This chapter Contents
9. CRANKCASE/CRANKSHAFT
Crankcase Installation
Clean the crankshaft with solvent and blow it
with compressed air. Then, check for damage
or other foreign materials attached.
Install new bearing into right crankcase.
Bearing driver 6204
Caution
y All rotation and sliding surfaces have to be
applied with clean engine oil.
y Remove all gaskets onto the crankcase
interfaces and flat it with special tool.
Install new bearing into left crankcase.
Bearing driver 6204
Install crankshaft onto the left crankcase.
Install left crankshaft puller and install bush onto
crankshaft.
Screw the left crankshaft puller onto crankshaft.
Turn the puller in C.W. direction and then
completely screw the puller to bottom.
Lubricate crankshaft bearing and bearing seat
with 2-stroke engine oil.
L. Crank shaft puller
Collar
L. Crank shaft install bush
Apply liquid gasket and dowel pin onto the
interface of left crankcase.
Apply liquid gasket
Dowel pin
9-5
This chapter Contents
9. CRANKCASE/CRANKSHAFT
Assemble the right crankcase with assembly
tools.
Install right crankcase onto the crankshaft.
Install right crankshaft puller and install bush
onto crankshaft.
Screw the right crankshaft puller onto
crankshaft.
Turn the puller in C.W. direction and then
completely screw the puller to bottom.
Lubricate crankshaft bearing and bearing seat
with 2-stroke engine oil.
R. Crank shaft puller
R. Crank shaft
install bush
Install the bolts and tighten them.
Torque value: 1.0 kgf-m
Bolts
With right crank shaft install bush, install new oil
seal into the right crankcase. Its installation
depth is 4mm as the diagram shown.
R. Crank shaft
install bush
Oil seal
With the specified tool to install a new oil seal
onto the left crankcase to the depth of 1 mm as
the diagram shown.
Caution
Make sure that the crankshaft can be rotated
freely after tightening the bolts.
Install the following components:
~ Final driving mechanism (chapter 8)
~ Alternator (chapter 6)
~ Piston/cylinder/cylinder head (chapter 7)
~ Oil pump (chapter 3)
~ Reed valve and carburetor (chapter 10)
~ Engine (chapter 4)
9-6
Oil seal driver
Home page
Contents
10. FUEL SYSTEM
Maintenance Information ················· 10-2
Flaot Level Inspection ······················10-7
Troubleshooting ······························· 10-2
Carburetor Installation ·····················10-7
Throttle Valve ···································· 10-3
Reed Valve ········································10-7
Carburetor Remove ·························· 10-4
Fuel Pump ·········································10-8
Auto By-Starter ································· 10-4
Air Cleaner ········································10-9
Float/Float Valve/Jet ························· 10-6
Throttle valve cable
Air hose
Oil tube
Vacuum hose
10
Carburetor
Fuel cap
Fuel pump
Fuel unit
Vacuum tube
Fuel filter
Fuel tank
10-1
This chapter Contents
10. FUEL SYSTEM
Maintenance Information
Precautions in Operations
Warning
Gasoline is a highly flammable material and may explosive under circumstance. Thus, always work
in a well-ventilated place and strictly prohibit flame when working with gasoline.
y Care must be taken when dealing with gasoline, and always work in a well-ventilated place and
strictly prohibit flame.
y When disassembling fuel system parts, pay attention to O-ring position, replace with new one as
re-assembly
y It has to conduct air bleeding operation as removed the oil tube.
y Idle speed adjustment.
Specification
Item
Venturi diameter
Fuel level
Air screw opener
Idle speed
Throttle handle free play
JET 50
15 mm
JET 100
16 mm
8.8±1.0mm
1 3/8
2000±100 rpm
2100±100 rpm
2~6 mm
Troubleshooting
Engine can not be started
Lean Mixture
1.
2.
3.
4.
1.
2.
3.
4.
5.
6.
7.
8.
No fuel in fuel tank
Fuel can not reach to carburetor
Too much fuel in cylinder
Clogged air cleaner
Stall after started
1.
2.
3.
4.
5.
6.
7.
8.
Incorrect idle speed adjustment
No spark on the spark plug
Low compression pressure
Rich mixture
Lean mixture
Clogged air cleaner
Inlet pipe leaking
Polluted fuel
10-2
Clogged carburetor jet
Clogged hose from carburetor to canister
Bend, squeezed or clogged fuel lines
Clogged fuel filter
Malfunction of float valve
Low fuel level in float chamber
Clogged vent pipe
Malfunction of fuel pump
Rich Mixture
1. Malfunction of float valve
2. Low fuel level in float chamber
3. Clogged carburetor air injector
This chapter Contents
10. FUEL SYSTEM
Carburetor
upper part
Throttle Valve
Removal
Remove the body cover.
Remove the carburetor upper part, throttle valve
spring and sealed cap.
Remove the throttle valve cable from the throttle
valve.
Remove needle clamp and fuel needle.
Oil hose
Inspection
Throttle valve spring
Sealed cap
Needle clamp
Throttle valve cable
Fuel needle clip
Fuel needle
Carburetor upper part
Washer
Throttle valve
Installation
Place the fuel needle onto the throttle valve and clip it with needle clamp.
Install the sealed cap, carburetor upper part, and throttle valve spring.
Connect the throttle valve cable to the throttle valve.
Install the throttle valve into the carburetor body.
Caution
Align the groove inside the throttle valve with the throttle stopper screw of the carburetor body.
Tighten the carburetor upper part.
Install carburetor protector.
Adjust the free play of throttle valve cable.
10-3
This chapter Contents
10. FUEL SYSTEM
Carburetor Remove
Remove the body cover.
Auto by-starter
Disconnect the auto by-starter connector.
Loosen draining screw and then drain out fuel
inside the carburetor.
Loosen carburetor upper part and remove
carburetor upper part.
Remove fuel and oil hoses from carburetor.
Remove carburetor mounting bolt and
carburetor.
Fuel hose
Carburetor
upper part
Bolt
Auto By-Starter
Inspection
Connect resistor meter to the terminals of auto
by-starter, and then measure its resistance.
If the resistance value exceeds specification too
much, it means that the PTC in the auto
by-starter is malfunction. Then, replace the
auto by-starter.
Resistance value: Max. 10Ω(at cold engine)
Caution
If the resistance value exceeds the standard a
little bit, the auto by-starter may still in normal.
However, it is necessary to check other
relative components for damage.
10-4
Draining screw
Auto by-starter
Connection hose clamp
This chapter Contents
10. FUEL SYSTEM
Remove carburetor, and allow it to cool off for 30
minutes.
Connect fuel rich circuit with a hose and pump
compressed air to the hose.
Air should flow into fuel rich circuit.
Replace the auto by-starter if the circuit clogged.
Connect battery to starter’s connectors and wait
for several minutes.
Pump compressed air into the fuel rich circuit.
Air should not flow into the circuit.
If air flow through the circuit, then, replace the
starter.
Battery
Check resistor to make sure that the auto
by-starter is in normal. Engine is running.
If the resistor is in open-circuit, then current will
not flow into the PTC. Thus, the auto by-starter
is not operated.
However, if the resistor is in short-circuit, current
higher than specification will flow into the PTC.
Then, it will cause the fuel rich circuit close
rapidly, and difficult to start the scooter.
Resistance value: 10.2Ω
Automatci By-Starter
Removal/Installation
Remove the cover of the auto by-starter.
Remove screw and mounting plate.
Remove the auto by-starter from carburetor.
Install in the reverse order of removal
procedures.
Alternator
Resistor
Auto by-starter
Screw
Mounting plate
10-5
This chapter Contents
10. FUEL SYSTEM
Float/Float Valve/Jet
Removal
Remove the float from carburetor body.
Remove the float pin and then remove float and
float valve.
Check the valve seat for worn out or damage.
Check float for bend and if fuel inside the float.
Before removing both the throttle valve stopper
and air screws, record their original turns for
close to their original set up position as
installation.
Float cap
Caution
Do not tighten the screw forcedly to avoid to
damaging the valve seat.
Remove main jet, needle jet seat and idle jet
and clean them and each component with
compressed air.
Air inlet for
fuel rich
circuit
Installation
Install the idle jet, the needle jet seat and main
jet. Then install the throttle valve stopper and air
screws to their original position according to the
marks as removal. Adjust the screws if replace
with new ones.
Air inlet for idle speed
Air screw
Float valve
Float
Float pin
Throttle valve
stopper screw
O-ring
Needle jet
Float cap
Idle jet
Needle jet seat
Main jet
Screw
Draining screw
10-6
This chapter Contents
10. FUEL SYSTEM
Flaot Level Inspection
Measure float fuel level to have the upper end of
float just contact with the float.
Float fuel level: 8.8 mm
Carefully bend the float arm for adjustment.
Check the float operation and the install it.
Carburetor Installation
Carburetor
upper part
Fuel hose
Caution
Do not let foreign materials into the
carburetor.
Install the carburetor and insulator onto intake
pipe with bolts.
Install fuel and vent pipes onto carburetor.
Install the carburetor upper part.
Tighten the connection hose.
Tighten the draining screw.
Connect the automatic by-starter connector.
Install air cleaner cap.
Conduct following operations
y Adjustment of throttle valve cable.
y Adjustment of oil pump.
y Adjustment of idle speed.
Bolt
Draining screw
Connection hose clamp
Inlet pipe
Reed Valve
Reed valve
Removal
Remove the body cover.
Remove the carburetor.
Remove carburetor insulator.
Remove inlet pipe.
Remove the reed valve.
10-7
This chapter Contents
10. FUEL SYSTEM
Inspection
Check the reed valve for damage and its reed
strength.
Check the reed valve seat for crack, damage
and the clearance between the seat and the
valve.
Replace reed valve if necessary.
Reed valve
Reed stopper
Caution
Do not bend the reed valve stopper.
Otherwise, it will cause its strength insufficient
and rough engine running. If the reed valve
or its seat is damaged, replace with a set.
Reed valve seat
Installation
Install in the reverse order of removal
procedures.
Check for leaking after installed.
Fuel Pump
Inspection
Remove the body cover.
Warm up the engine and adjust idle speed.
Remove fuel hose from carburetor and then wait
for 5 minutes.
Measure the output of fuel pump. Its output
time is 10 seconds.
Output quantity: Min. 20 c.c.
If the output quantity is lower than 20 c.c., check
fuel hose, vacuum hose and fuel filter.
Carburetor
Fuel hose
connector
Fuel hose
Removal/Installation
Bolt
Remove floor plate.
Remove fuel inlet, outlet and vacuum hoses.
Remove 2 bolts and fuel pump.
Install the fuel pump in the reverse order of
removal procedures.
Fuel inlet
hose
Fuel outlet
hose
Vacuum
hose
10-8
This chapter Contents
10. FUEL SYSTEM
Air Cleaner
Hose clamp
Removal/Installation
Loosen connection hose clamp.
Remove 2 bolts and then remove the air
cleaner.
Install in the reverse order of removal
procedures.
Bolts
10-9
This chapter Contents
10. FUEL SYSTEM
Notes:
10-10
Home page
Contents
11. BRAKE SYSTEM
Front Disc Brake System ···············11-1
Disc Brake -Air Bleed······················· 11-6
Rear Drum Brake System ··············11-2
Disc Brake - Caliper ························· 11-6
Maintenance Information ···············11-3
Brake Disc········································· 11-7
Troubleshooting ·····························11-4
Disc Brake - Master Cylinder··········· 11-7
Hydraulic Disc Brake······················11-5
Drum Brake······································· 11-10
Front Disc Brake System
3.5 kgf-m
11
0.55 kgf-m
1.8 kgf-m
1.0 kgf-m
2.5 kgf-m
4.5 kgf-m
6.0 kgf-m
11-1
This chapter Contents
11. BRAKE SYSTEM
Rear Drum Brake System
11.0 kgf-m
2.5 kgf-m
0.55 kgf-m
11-2
This chapter Contents
11. BRAKE SYSTEM
Maintenance Information
Precautions in Operation
Caution
Inhaling brake lining ashes may cause disorders of respiration system, therefore, never use air
hose or dry brush to clean brake parts. Use vacuum cleaner or other authorized tool instead.
y The brake caliper can be removed without removing the hydraulic system.
y After the hydraulic system is removed, or the brake system is felt to be too soft, bleed the hydraulic
system.
y While refilling brake fluid, care should be taken not to let the foreign material entering into the
brake system.
y Do not spill brake fluid on the painted surfaces, plastic or rubber parts to avoid damage.
y Check the operation of the brake system before you go.
Specifications
Item
Standard (mm)
Limit (mm)
3.5
2.0
< 0.10
0.3
Master cylinder inner diameter
12.700 – 12.743
12.55
Master cylinder piston outer
diameter
12.657 – 12.684
12.654
110.0
110.5
Thickness of front brake lining
4.0
2.0
Thickness of rear brake lining
4.0
2.0
The thickness of front brake disc
Front brake disc run-out
ID of rear brake drum
Torque values
Brake hose bolt
Bolt for brake caliper
Bolts for the lining guide pin
Bolts for the lining guide pin cap
Air-bleed valve
Bolts for the brake disc
Nuts for the wheel rim
Nuts for the front wheel
Nuts for the rear wheel
Bolt for rear brake arm
3.5 kgf-m
3.3 kgf-m
1.8 kgf-m
1.0 kgf-m
0.55 kgf-m
4.5 kgf-m
2.5 kgf-m
6.0 kgf-m
11.0 kgf-m
0.55 kgf-m
11-3
This chapter Contents
11. BRAKE SYSTEM
Troubleshooting
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
Drum Brake
Poor brake performance
1.
2.
3.
4.
5.
Improper brake adjustment
Worn brake lining
Worn brake drum
Worn brake cam
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
11-4
Hard operation of brake
lever
1.
2.
3.
4.
Blocked brake system
Poor brake caliper
Blocked brake pipe
Seized/worn master
cylinder piston
5. Bent brake lever
Uneven brake
1.
2.
3.
4.
Dirty brake lining/disc
Poor wheel alignment
Clogged brake hose
Deformed or warped brake
disc
5. Restricted brake hose and
fittings
Tight operation or low
return speed of brake
lever
1. Worn/broken/crack return
spring
2. Worn drum
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
Tight brake
1. Dirty brake lining/disc
2. Poor wheel alignment
3. Deformed or warped brake
disc
Brake noise
1. Dirty lining
2. Deformed brake disc
3. Poor brake caliper
installation
4. Imbalance brake disc or
wheel
Brake noise
1.
2.
3.
4.
Worn brake lining
Worn drum
Dirty brake lining
Dirty brake drum
This chapter Contents
11. BRAKE SYSTEM
Hydraulic Disc Brake
Close the drain valve of the hydraulic disc brake.
Replace the brake fluid.
Before the brake fluid reservoir is removed, turn
the handle so that the brake fluid reservoir
becomes horizontal, then remove the brake fluid
reservoir.
Cover the painted surfaces, plastic or rubber
components with a rag when servicing brake
system.
Cap
Lower level
Cap plate
Diaphragm
Upper level
Caution
Spilled brake fluid on painted surfaces, plastic
or rubber components may result in their
damages.
Air bubble
Drain valve
Remove the master cylinder cap and diaphragm.
Use brake fluid to clean the dirty brake disc.
Caution
The dirty brake lining or disc will reduce the
brake performance.
Refill up same grade brake fluid into the
reservoir.
Caution
To mixed non-compatible brake fluid will
reduce brake performance. Foreign materials
will block the system causing brake
performance to be reduced or totally lost.
Connect drain hose to drain valve.
Open the drain valve on the caliper and operate
the brake lever until the old brake fluid is entirely
drained out. Close the drain valve and add
specified brake fluid into the brake master
cylinder.
Recommended brake fluid: WELLRUN DOT 3
brake fluid
Caution
To reuse the spent brake fluid will effect brake
performance.
Drain hose
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.
11-5
This chapter Contents
11. BRAKE SYSTEM
Disc Brake -Air Bleed
Air bubble
Drain valve
1. Tightly hold the brake lever and open the
drain valve around 1/4 turns, and then close
the valve.
Caution
y Do not release the brake lever before the
drain valve is closed.
y Always check the brake fluid level when
carrying out the air bleeding procedure to
avoid air enter into the system.
Drain hose
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.
4. Tightly close the drain valve.
5. Make sure the brake fluid is in the UPPER
level of the master cylinder, and refill the
fluid if necessary.
6. Cover the cap.
Caliper bolt
Collar bolt
Brake hose
bolt
Disc Brake - Caliper
Removal
Installation
Place a container under the brake caliper, and
loosen the brake hose bolt and finally remove
the brake hoses.
Install the brake caliper and tighten the attaching
bolts securely.
Torque: 3.3 kgf-m
Caution
Do not spill brake fluid on painted surfaces.
Remove the bolt cap and loosen the lining guide
bolts.
Remove two caliper bolts and the caliper.
11-6
Caution
y Use M8 x 35 mm flange bolt only.
y Long bolt will impair the operation of brake
disc.
Tighten the lining guide bolt.
Torque: 1.8 kgf-m
Install bolt cap.
Torque: 1.0 kgf-m
Use two seal washers and hose bolts to lock the
hose and brake caliper in place.
Torque: 3.5 kgf-m
Refill up the brake fluid to the reservoir and
make necessary air bleeding.
This chapter Contents
11. BRAKE SYSTEM
Brake Disc
Inspection
Brake disc
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
Micrometer
Remove the brake disc from wheel.
Check the disc for deformation and bend.
Allowable limit: 0.30 mm
Disc Brake - Master Cylinder
Master Cylinder Removal
Master cylinder
Caution
Do not let foreign materials enter into the
cylinder.
Caution
The whole set of master cylinder, piston,
spring, diaphragm and cir clip should be
replaced as a set.
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 cir clip.
Remove the piston and the spring.
Clean the master cylinder with recommended
brake fluid.
Brake hose
Clip
Rubber pad
Piston
Spring
Master cylinder
11-7
This chapter Contents
11. BRAKE SYSTEM
Master Cylinder Inspection
Cylinder gauge
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: 12.550 mm
Master cylinder
Measure the outer diameter of the piston.
Replace the piston if its measured value
exceeds allowable limit.
Allowable limit: 12.654 mm
Piston
Micrometer
Master Cylinder Assembly
Caution
y It is necessary to replace the whole set
comprising piston, spring, piston cup, and
cir clip.
y 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 cir clip.
Caution
y Never install cup lip in the opposite
direction.
y Make sure the cir clip is seated securely in
the groove.
Install the rubber pad into groove properly.
11-8
Rubber
bush
Sub-cup
Cir clip
Piston
Sub-cup
Spring
Master cylinder
This chapter Contents
11. BRAKE SYSTEM
Install the rubber pad into the groove correctly.
Place the master cylinder onto handlebar, and
install the bolts.
Install the brake lever, and connect leads to
brake lamp switch.
Master cylinder
Brake lamp switch
Connect brake hoses with 2 new washers.
Tighten the brake hose bolt to the specified
torque value.
Make sure the hose is installed correctly.
Install all wires, hoses, and components
carefully so avoid to twisting them together.
Washers
Caution
Improper routing may damage leads, hoses or
pipes.
Hose bolt
Brake hose
Caution
Kink of brake leads, hose or pipe may reduce
brake performance.
Add specified brake fluid and bleed the system.
11-9
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11. BRAKE SYSTEM
Rear Drum Brake
To use vacuum cleaner or other alternatives to
avoid danger caused from dusts.
Caution
y Inhaling brake lining ashes may cause
disorders of respiration system, therefore,
never use compressed air or dry brush to
clean brake parts.
y Brake performance will be reduced by
grease on brake lining.
Rear brake drum
Remove wheel and brake drum.
Inspection
Check brake drum for damage or wear out, and
replace it if necessary.
Measure the inner diameter of brake drum and
record the max. value.
Allowable limit: rear (110.5mm)
Caution
y Clean the rust onto the brake drum with
#120 sand-paper.
y Measure the inner diameter of brake drum
with micrometer.
Measure the thickness of brake lining at three
points (both ends and center).
If the thickness is less than specified value or if
it is contaminated by oil or grease, replace as a
set.
Service limit: Rear: 2.0 mm
Brake lining
Brake shoe spring
Removal
Caution
Brake linings must be replaced as a shoes.
Remove the brake linings from brake panel.
11-10
Brake shoes
This chapter Contents
11. BRAKE SYSTEM
Bolt
Installation
Apply with a thin coat of grease to the brake
cam and the anchor pin.
Install brake cam.
Never allow brake linings to be contaminated by
oil or grease.
Wipe off the excessive grease from brake cam
and the anchor pin.
Caution
Brake efficiency will be reduced if brake
linings is contaminated by oil or grease.
Rear brake arm
Install the brake cam and arm after aligning it
with the punched point.
Tighten the bolts and nuts to specified torque:
Torque value: 0.4-0.7 kgf-m
Bolt
Brake arm big indent
Wear indicator plate
Brake arm
Use a brake cleaner to clean brake hub and
replace the two brake shoes if brake linings are
contaminated.
Brake shoes
Caution
Brake efficiency will be reduced if brake
linings is contaminated by oil or grease.
Install spring onto the brake shoes.
Install the brake shoes to the brake panel one
after one, and make sure the shoe springs are in
correct position.
Install the wheel.
Brake shoe spring
Brake shoe spring
Brake shoes
11-11
This chapter Contents
11. BRAKE SYSTEM
Notes:
11-12
Home page
Contents
12. BODY COVER
Body Overview ······························· 12-1
Front Under Spoiler ························ 12-7
Maintenance Information ··············· 12-2
Front Inner Box······························· 12-8
Side Covers····································· 12-3
Floor Panel ······································ 12-9
Luggage Box··································· 12-3
Front Fender ··································· 12-9
Body Cover ····································· 12-4
Steering Handle Cover ··················· 12-10
Front Cover ····································· 12-6
Under Cover ···································· 12-11
Body Overview
Seat
Battery cover
Rear fender
Floor mat
Luggage box
Battery case
Handle rear cover
Right body cover
Handle front cover
Rear
mudguard
Right side cover
Plug maint. cover
Rear center
cover
Front cover
Center cover
Left body cover
Fuel lid
Floor panel
Left side cover
Front inner
cover
Front fender
Front under spoiler
Under cover
12-1
12
This chapter Contents
12. BODY COVER
Maintenance Information
Body covers disassemble sequence:
Handlebar Front Cover
Front Cover
Luggage Box/Seat
Handlebar Rear Cover
Front Spoiler
Center Cover
Front Fender
Left/Right Side Cover
Front InnerCover
Body Cover
Rear Mudguard
Rear Fender
Floor Panel
Under Cover
y
y
y
y
y
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
This chapter Contents
12. BODY COVER
Side Covers
1. Removal:
y Remove 3 screw (front/middle) from two
side covers.
y Slide the side cover backward so that
their hooks are out of slots.
y Take out the side cover end part and
then remove the cover.
Screws
2. Installation:
y
Install in reverse order of removal
procedures.
Caution
The tail of each cover is held with buckles
and slot, never pull them with force, or it
would crack the buckles.
Luggage Box
Screw
Nut
1. Removal:
y
y
y
y
y
y
y
Lift up seat cushion.
Remove battery compartment screw and
cover.
Remove luggage box mounting screws
(1 screw).
Remove luggage box nut (2 nuts)
Remove luggage box bolt (1 bolt)
Remove oil tank cap and oil guide
rubber.
Hold the luggage box in both front and
rear sides by two hands, and then lift up
the box to remove it.
Bolt
2. Installation:
y
Install in reverse order of removal
procedures.
12-3
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12. BODY COVER
Body Cover
Bolts
1. Removal:
y Remove 4 bolts from rear carrier, and
then remove rear carrier.
y Remove 1 screw and 2 nuts and 1bolt
from luggage box, and then remove
luggage box.
z
Remove 3 screws from the tail cover,.and
then remove the tail cover.
Remove 2 screws astern of the body cover
Screws
12-4
This chapter Contents
12. BODY COVER
Remove 2 screw form of the body cover
Bolts
Remove the body cover.
2. Installation:
y Install in reverse order of removal
procedures.
12-5
This chapter Contents
12. BODY COVER
Front Cover
1. Removal:
y Remove 2 bolts from the front side
reflector, and then remove front side
reflector.
Screws
y Remove 2 screws from the front inner
box and front cover.
Screws
y Remove 1 screw from the front cover.
Screws
y
y
Remove electric cord coupler from the
head light.
Remove the front cover.
2. Installation
y
12-6
Install in reverse order of removal
procedures.
This chapter Contents
12. BODY COVER
Front Under Spoiler
1.
Removal:
y Remove right and left side cover. (6
screws)
Screw
y
Remove 4 screws from the front inner
box.
Screws
y
Remove 2 screws from the front upper
part of the front spoiler and the front
inner box.
Screws
y
Remove the front spoiler.
2. Installation:
y
Install in reverse order of removal
procedures.
12-7
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12. BODY COVER
Front Inner Box
Key set cover
1. Removal:
y
y
y
y
Remove the front cover.
Remove the front under spoiler.
Remove hook and 1 screw.
Remove key set cover.
Hook & 1 screw
y
Remove 2 bolts from the floor panel.
Bolts
y
Remove the front inner box.
2. Installation:
y
12-8
Install in reverse order of removal
procedures.
This chapter Contents
12. BODY COVER
Floor Panel
1. Removal:
y
y
Remove 6 screws and the side cover.
Remove 6 screws and the body cover.
Bolts
y
Remove the floor panel. (4 bolts)
2. Installation:
y
Install in reverse order of removal
procedures.
Bolt
Front Fender
Removal:
y
y
y
Ramoval 1 bolt and fr brake hose clamp.
Ramoval 2 screws form front fender right
and left side.
Ramoval front fender.
Screws
Screws
12-9
This chapter Contents
12. BODY COVER
Steering Handle Cover
Screws
1. Removal:
y
y
Remove 6 screws from the handle rear
cover.
Remove handle front cover.
Screw
y
Remove front winker electric cord
coupler
y
Remove 1 screw from rear side by
handle rear cover.
Remove 2 inner screws.
Disconnect each switch connectors.
Remove speedometer cable.
y
y
y
Electric cord coupler
Speedometer cable
y
Remove handle rear cover.
2. Installation:
y
Install in reverse order of removal
procedures.
Caution
Push the front connection part of rear handle
cover at first when removing front cover so
that the buckles are out of the cover. Never
push it forcefully to cause buckles broken or
cover damaged.
12-10
2 Screws
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12. BODY COVER
Under Cover
1. Removal:
y
y
Remove 2 bolts from the under cover.
Remove under cover.
2 bolts
2 nuts
2. Installation:
y
Install in reverse order of removal
procedures.
12-11
This chapter Contents
12. BODY COVER
Note:
12-12
Home page
Contents
13. STEERING/FRONT WHEEL/SUSPENSION
Maintenance Information ················· 13-2
Front Wheel ······································· 13-4
Troubleshooting ······························· 13-2
Front Shock Absorber ······················ 13-8
Steering Handle ································ 13-3
Front Fork·········································· 13-9
1.5 kgf-m
4.5 kgf-m
0.25 kgf-m
13
3.3 kgf-m
2.7 kgf-m
6.0 kgf-m
13-1
This chapter Contents
13. STEERING/FRONT WHEEL/SUSPENSION
Maintenance Information
Specification
Item
Standard value (mm)
Limit (mm)
Shaft bending
─
0.2 (0.01 in)
Radial
─
2.0 (0.08 in)
Axial
─
2.0 (0.08 in)
Rim wobbling
Torque Value
Steering handle nut
4.5 kgf-m Front brake caliper bolt
3.3 kgf-m
Front wheel axle
6.0 kgf-m Steering stem mounting nut
1.5 kgf-m
Front shock absorber mounting nut
2.7 kgf-m Top cone race
0.25 kgf-m
Special Tools
Inner bearing puller
Bearing driver
Troubleshooting
Hard To Steer
The Front Wheel Wobbling
1.
2.
3.
1.
2.
4.
The steering shaft bolt is too tight.
The steering shaft bearing are damaged
The ball and the top cone of the steering
shaft are damaged.
Insufficient tire pressure.
3.
4.
5.
The Steering Handle Is Tilted
1.
2.
3.
Uneven arrangement of the front shock
absorbers.
The front fork is bent.
The front wheel axle is bent.
The rim is bent.
The wheel axle nut is not tightened
improperly
Bend wheel rim
Side-worn or poor tire.
The bearing play of the wheel axle is too
large.
Soft Shock Absorber
1.
Weak front shock absorber spring
Noise In Front Shock Absorber
1.
2.
13-2
Shock absorber outer tube noise
The joint of the shock absorber gets loose.
This chapter Contents
13. STEERING/FRONT WHEEL/SUSPENSION
Master cylinder
Steering Handle
Removal
Rear brake lever seat
Remove handle cover, front cover and inner
box.
Remove throttle grip after mounting screw
removed.
Remove master cylinder (disc brake) after 2
bolts removed.
Remove rear brake lever bracket after mounting
bolt removed.
Remove handle mounting bolt and nut, and then
remove the handle.
Nut
Bolt
Installation
Install handle and align with bolt hole.
Install bolt and nut and then tighten it.
Torque value: 4.5 kgf-m
Apply with grease onto throttle cable and the
sliding surface of handle.
Align the lock pin of the handle outer tube with
the hole on the handle, and then install the
handle.
Tighten the bolt.
Caution
Align the lock pin with the hole on the handle
and also install brake lever seat. Then,
tighten the lever with clamp and bolt.
13-3
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13. STEERING/FRONT WHEEL/SUSPENSION
Place master cylinder onto handle and align its
connection surface with bolt hole on the handle
(disc brake).
Install the mounting seat.
Tighten the upper part bolt, and then tighten
lower bolt.
Install all components in reverse order of
removal procedures.
Conduct following adjustment:
y Oil pump control cable.
y Throttle operation.
Brake lever free play
Master cylinder
Bolt
Front Wheel
Removal
Remove speedometer cable from speedometer
gear box.
Speedometer cable
Remove front wheel axle nut, and then pull out
the axle and remove the wheel.
Axle nut
13-4
This chapter Contents
13. STEERING/FRONT WHEEL/SUSPENSION
Inspection
Place the axle onto a V-block to measure its
run-out with a dial gauge.
The dial gauge indicated 1/2 run-out.
Service limit: 0.20 mm
Wheel axle
Place the wheel on to a rotation seat, and turn
the wheel to check its bearing free play. If the
bearing is noisy or its free play is too much,
replace it.
Free play
Free play
Place the wheel on to a rotation seat to check its
rim wobbling. Turn the wheel with hand and
measure its rim wobbling value with a dial
gauge.
Service limit:
Radial: 2.0 mm (0.08 in)
Axial: 2.0 mm (0.08 in)
Remove 5 bolts and brake disc.
Bolts
13-5
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13. STEERING/FRONT WHEEL/SUSPENSION
Remove dust seal, bearing and side collar.
Special tools
Inner bearing puller (SYM-6204020)
Installation
Fill out the block of bearing by grease.
Drive the left bearing and install the dist. collar.
Install the right bearing.
Dist. collar
Dust seal
Caution
y Carefully install the bearing in correct and
evenly.
y Bearing outer face should be faced up as
bearing installation.
Bearing
Dust seal
Install the brake disc and then tighten the bolts
(disc brake).
Torque value: 4.5 kgf-m
13-6
Bolts
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13. STEERING/FRONT WHEEL/SUSPENSION
Lubricate the speedometer gear with grease and
install the gear into the wheel hub.
Align the flange part on the speedometer gear
with the slot of wheel hub.
Caution
Contaminated brake lining will reduce brake
performance so the brake lining, brake drum
and disc must be free of grease.
Apply with grease onto the dust seal.
Install the dust seal and side collar.
Place the front wheel between the front shock
absorbers.
Caution
Align the brake disc groove with the stopper
flange.
Stopper
Front fork groove
Insert the wheel axle into the wheel and the
install the wheel axle nut.
Tighten the nut to specified torque.
Torque value: 6.0 kgf-m
Connect the speedometer cable to the
speedometer gear.
Shaft nut
Speedometer cable
13-7
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13. STEERING/FRONT WHEEL/SUSPENSION
Front Shock Absorber
Removal
y
y
y
y
Front cover
Front under spoiler
Front fender
Front wheel
Disc Brake
Bolts
Remove the caliper mounting bolt and the
caliper.
Take out the hose from hose clamp.
Remove the front shock absorber upper bolt and
the shock absorber.
Hose clamp
Brake caliper
Bolts
Shock absorber
Installation
Align the cover flange with upper level of the
shock absorber clamp, and then tighten bolts.
Torque value: 2.7 kgf-m
Install the removed components in reverse order
of removal procedures.
13-8
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13. STEERING/FRONT WHEEL/SUSPENSION
Front Fork
Removal
Steering stem
mounting nut
y Handle
y Front wheel
y Front shock absorber
Remove the steering stem mounting nut.
Remove top cone race and front fork.
Caution
Place the steel ball onto a parts container to
prevent from missing.
Top cone race
Slightly tap the top and bottom ball bearing
seats with a plastic hammer to remove the
seats.
Remove bottom cone race body with a punch.
Caution
Do not damage the steering stem.
Installation
Install a new bottom cone race onto the steering
stem.
Push the cone race until to mounted position.
Steering stem mounting nut
Top cone race
Top ball
bearing seat
Caution
Bottom ball
bearing seat
Do not tilt the ball bearing seats as
installation.
Steel balls
Apply with grease onto the ball bearing seats,
and install steel balls onto the seats.
(Top: 26 balls, bottom: 29 balls)
Bottom cone race
Steering lock nut
Lubricate the top cone race seat with grease.
Screw the cone race in to top ball bearing seat
till touching, and then screw out the cane race
1/4~3/8 turns.
Torque value: 0.25 kgf-m
Return 1/2 turns
Caution
Check the steering stem that should be
rotated freely and no clearance in vertical
direction.
Locking to
1/4~3/8 turns
Top cone-race
13-9
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13. STEERING/FRONT WHEEL/SUSPENSION
Install the steering stem mounting nut and
tighten the nut by means of holding the top cone
race body.
Torque value: 1.5 kgf-m
Steering stem mounting nut
Install in reverse order of removal procedures.
Top cone race
13-10
Home page
Contents
14. REAR WHEEL/SUSPENSION
Maintenance Information ················· 14-2
Rear Wheel ······································· 14-3
Troubleshooting ······························· 14-2
Rear Shock Absorber ······················ 14-4
2.7 kgf-m
4.0 kgf-m
11.0 kgf-m
14
3.3 kgf-m
14-1
This chapter Contents
14. REAR WHEEL/SUSPENSION
Maintenance Information
Specification
Item
Rear wheel rim run out
Standard value (mm)
Torque Value
Rear shock absorber upper mounting bolt: 4.0 kgf-m
Rear shock absorber lower mounting bolt: 2.7 kgf-m
Rear wheel nut: 11.0 kgf-m
Rear wheel hub: 2.5 kgf-m
Exhaust muffler nut: 1.2kgf-m
Exhaust muffler bolt: 3.3 kgf-m
Troubleshooting
Rear wheel wobbling
1. bend wheel rim
2. poor tire
3. loosen wheel shaft
Shock absorber too soft
1. insufficient shock absorber spring force
Poor brake performance
1. Poor brake adjustment
2. contaminated brake lining
3. worn brake lining cam
4. worn brake cam lever
5. worn brake drum
6. improper installation of brake arm gear set.
14-2
-
Limit (mm)
2.0 (0.08 in)
This chapter Contents
14. REAR WHEEL/SUSPENSION
Rear Wheel
Remove
Remove exhaust pipe nut. (2 connection nuts)
Connection nuts
Remove exhaust muffler bolt (3 bolts), then
remove the muffler.
Bolts
Muffler
Remove rear wheel shaft nut and then remove
the rear wheel.
Shaft nut
Inspection
As the diagram shown, measure wheel rim
wobbling with a dial gauge.
Service limit:
Radial: 2.0 mm (0.08 in)
Axial: 2.0 mm (0.08 in)
14-3
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14. REAR WHEEL/SUSPENSION
Brake Hub Replacement
Remove 4 nuts of cover and wheel rim, and then
remove the wheel hub.
Install the wheel hub and tighten the nuts.
Tighten torque: 2.5 kgf-m
Installation
Install the rear wheel and tighten the nut.
Tighten torque: 11.0 kgf-m
Install exhaust pipe & muffler.
Tighten torque (bolt): 3.3 kgf-m
Tighten torque (nut): 1.2 kgf-m
Install the body cover.
Upper mounting bolt
Rear Shock Absorber
Removal
Remove body cover.
Remove rear shock absorber upper & lower
bolts.
Remove rear shock absorber.
Installation
Install the rear shock absorber.
Tighten the upper & lower mounting bolts to
specified torque.
Torque value:
Upper mounting bolt: 4.0 kgf-m
Lower mounting bolt: 2.7 kgf-m
Press down the tail of the scooter for several
times to check shock absorber operation.
Installation all components in reverse order of
removal procedures.
Lower mounting bolt
14-4
Home page
Contents
15. ELECTRICAL EQUIPMENT
Maintenance Information ··············· 15-2
Starting System ······························ 15-13
Troubleshooting ····························· 15-3
Oil Level Switch ······························ 15-15
Battery ············································· 15-4
Fuel Unit ·········································· 15-16
Charging System ···························· 15-5
Switch/Horn ···································· 15-17
Ignition System······························· 15-10
Bulb Replacement ·························· 15-19
Head Light Relay
(Jet Euro only)
Resistor Comp
Winker Relay
Headlight Fuse
(Jet Euro only)
Reg. Rec. Comp
Head Light Control Unit
(Jet Euro only)
Clock
Horn / Winker /
Dimmer Switch
Horn
Main Switch
Start / Headlight Switch
Fuel Unit
Spark Plug
15
IG. Coil
AC. Generator
Battery
Fuse Box
Oil Level Switch
Start Relay
CDI Unit
15-1
This chapter Contents
15. ELECTRICAL EQUIPMENT
Maintenance Information
Precautions in Operation
y 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.)
y The model of the spark plug and the tightening torque.
y The ignition timing.
y Adjustment of headlight.
y Removal and installation of AC generator.
y The maintenance-free battery requires no inspection of electrolyte level and refilling of distilled
water.
y To recharge the battery, remove the battery from the motorcycle without removing ventilation caps.
y Unless in emergency, never rapid charge the battery.
y The voltage must be checked with the voltmeter while charging the battery.
y As C.D.I assembly does not require an ignition timing check. In case ignition timing is incorrect,
check C.D.I and AC generator. Verify with an ignition timing light after replacement if necessary.
y The starter motor can be removed after the engine is removed.
Specification
Charging System
Item
Battery
Specification
Capacity
12V3Ah
Charging rate
0.4A / 5 hours (standard), 4A / 0.5 hour (fast charging)
Leak current
< 1 mA
Charging current
1.2 A / 5000 rpm
Control voltage in charging
14.0 - 15.0 V / 5000 rpm
Control voltage in headlight
12.6 - 13.6 V / 5000 rpm (JET 50/100)
Ignition System
Item
Model
Spark plug
Ignition coil and resistance
Ignition timing
15-2
Specification
“F” mark
JET 50 series
NGK BR8HSA
(Recommended)
JET 100 series
NGK BR6HSA
(Recommended)
Gap
0.6 - 0.7 mm
Primary coil
0.19 – 0.23 Ω
Secondary coil
2.8 – 3.4 KΩ
17° BTDC / 1800 rpm
This chapter Contents
15. ELECTRICAL EQUIPMENT
Troubleshooting
No voltage
y
y
y
y
Battery discharged
The cable disconnected
The fuse is blown
Improper operation of the main switch
Low voltage
y
y
y
y
The battery is not fully charged
Poor contact
Poor charging system
Poor voltage regulator
No spark produced by spark plug
y
y
y
y
y
y
The spark plug is out of work
The cable is poorly connected, open or
short-circuited
- Between AC.G. and C.D.I.
Poor connection between C.D.I. and ignition
coil
- Poor connection between C.D.I. and the
main switch
Poor main switch
Poor C.D.I.
AC.G. is out of work
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
y Starter relay is out of work
y The ignition coil is poorly connected, open or
short-circuited
y The starter motor is out of work
y
y
y
y
y
Charging system does not operate
properly
y
y
y
y
Burnt fuse
Poor contact, open or short circuit
Poor regulator
Poor ACG
Engine does not crank smoothly
y
y
y
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 ignition coil cable
- Current leakage in the spark plug cap
Incorrect ignition timing
- Poor AC.G.
- Improper installation of the pulse sensor
- Poor C.D.I.
Weak starter motor
y
y
y
y
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
y
y
y
Poor starter motor pinion
The starter motor run in reverse direction
Poor battery
Intermittent power supply
y The connector of the charging system
becomes loose
y Poor connection of the battery cable
y Poor connection or short-circuit of the
discharging system
y Poor connection or short-circuit of the power
generation system
15-3
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15. ELECTRICAL EQUIPMENT
Battery
Battery Removal/Installation
Turn off main switch.
Open seat.
Remove screw and the open battery cover.
Disconnect the negative cable terminal first, then
the positive cable terminal.
Remove the battery from the scooter.
Install the battery in reverse order of removal.
Voltage Check
Open seat and battery cover.
Remove wires from battery.
Check battery voltage.
Voltage:
Fully charged: 13.0 – 13.2V
Undercharged: 12 V
Charging
Remove the battery.
Connect the positive terminal (+) of the charger
to the battery positive terminal (+).
Connect the negative terminal (-) of the charger
to the battery negative terminal (-).
Standard charging current/time: 0.4A/5 hrs.
Fast charging current/hrs: 4A/0.5 hr.
Caution
Strictly keep flames and sparks away while
recharging to avoid to explosion causing by
hydrogen.
Stop charging battery when electrolyte
temperature is over 45℃(117℉).
Caution
Fast charging the battery is for in emergency
only. Battery should be charged in standard.
15-4
Negative terminal
Positive terminal
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15. ELECTRICAL EQUIPMENT
Charging System
JET 50 / JET 100
Green
White
Red
Yellow
Resistor 5.9Ω 30W
Resistor 10.2Ω 5W
AC. Generator
Auto by- starter
Pink
Green/
Black
JET EURO 50 / JET EURO 100
Main Switch
Auto by- starter
Green
Red
Yellow
Black
Fuse 15A
Yellow
Yellow
Green/
Black
Regulator rectifier
Resistor 8Ω 5W
Battery
Yellow
AC. Generator
15-5
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15. ELECTRICAL EQUIPMENT
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.
Ammeter
Battery (-) terminal
Ground circuit
Caution
y 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.
y Do not turn the main switch to ON position
during test.
Digital voltmeter
Ammeter
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.
Fuse connector
Charging Voltage Inspection
Caution
y Before conducting the inspection, be sure
that the battery is fully charged. If
undercharged, the current changes
dramatically.
y Use a fully charged battery having a
voltage larger than 13.0 V
y While starting the engine, the starter motor
draws large amount of current from the
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
an ammeter having an indication that shows
both positive and negative direction current.
The measurement would be at zero, if the
ammeter is one direction only.
15-6
Caution
y Do not use short-circuit cable.
y 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 starter to start
the engine.
y 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.
Connect a tachometer.
Turn on the headlight to high beam and start the
engine.
Accelerate the engine to the specified revolution
per minute and measure the charging voltage.
Specified Charging Current: 1.2 A / 5000 rpm
Control Charging Voltage: 14.0~15.0 V / 5000
rpm
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15. ELECTRICAL EQUIPMENT
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.
Headlight Voltage Inspection
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.
Front cover
JET 50/100 series
Connect a tachometer.
Do not disconnect the headlight harness
connector after engine started.
Turn the headlight ON and to high beam
position.
Measure the voltage between the blue wire (+)
and green wire (-) while the headlight harness is
still in connection. Measure alternating current
voltage with a voltmeter.
Gradually increase engine speed and read the
voltage in each specified rpm.
Control voltage: 12.0~14.0 V / 5000 rpm
Resistance Measurement of Resistor at 20℃.
Resistor (10.2Ω5W) Green/Black and Body
ground: 9.0Ω~10.0Ω
Resistor (5.9Ω5W) Pink and Body ground:
5.6Ω~6.2Ω
JET EURO 50/100 series
Turn the headlight ON and to high beam position.
Measure the voltage between the blue wire (+)
and green/white wire (-) while the headlight
harness is still in connection. Measure direct
current voltage with a voltmeter.
Resistance Measurement of Resistor at 20℃.
Resistor (8Ω5W) Green/Black and Yellow:
7.0Ω~9.0Ω
Headlight connector
Resistor
15-7
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15. ELECTRICAL EQUIPMENT
Voltage Regulator Inspection –
JET 50/100
Check the each pins of connector on the voltage
regulator.
Voltage regulator
Voltage regulator
connector
Inspection
Check voltage between battery terminal (red) and ground
(green).
Check continuity between ground and frame.
Check charging coil (white to ground) if its resistance is
within 0.2~1.0Ω
Check charging /illumination coil (yellow to ground) if its
resistance is within 0.2~0.8Ω
If wire circuit check is in normal and there is no
loose in the pins of voltage regulator connector,
then measure the resistance among pins on the
connectors of voltage regulator.
Voltage Regulator
Multi-meter(+)
Multi-meter (-)
Probable cause
Blown fuse or poor main switch
contact
Open-circuit wire
Open-circuit in alternator charging
coil or in illumination switch.
White Yellow Red Green
A
L
B
E
White A
4~7
∞
Yellow B
∞
∞ 2.4~4.8
Red B
4~7
∞
∞
Green E
∞ 2.4~4.8 ∞
If the resistance values are abnormal among the
pins, replace the voltage regulator.
Yellow (L)
Red (B)
White (A)
Green (E)
Caution
y If the probe is touched by finger, then the
resistance values will be incorrect.
y It contains semi-conductor in circuit so the
measured resistance value will be in
different if different testers are used. Thus,
these values cannot be judged with
standards.
AC Generator Inspection
Remove body cover.
Disconnect the generator harness connector.
Measure the resistance on both charging coil
(the white to ground) and illumination coil (the
yellow to ground).
Resistance Measurement: (20℃)
Charging coil (white - green): 0.2~1.0Ω
Illumination coil (yellow - green): 0.1~0.8Ω
15-8
AC. Generator
harness connector
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15. ELECTRICAL EQUIPMENT
Inspection on SCR – JET EURO 50/100
Remove the front cover.
Disconnect 4P connectors to remove the SCR.
Item
Check Points Standard Value
Main switch
R–B
Battery voltage
connection
(ON)
Battery
R–G
Battery voltage
connection
Charging coil
Y–Y
0.4~0.8Ω
If the readings measured are not normal, check
parts in the circuit.
If the parts are normal, then trouble is in the
wiring.
If there is nothing wrong with parts and wiring,
replace the SCR.
Inspection on the Charging Coil
Regulator rectifier
AC generator
harness connector
Caution
The test can be carried out without removing
the charging coil from the engine.
Measure the resistance between each yellow
wire of the SCR.
Standard resistance: 0.4~0.8Ω
15-9
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15. ELECTRICAL EQUIPMENT
Ignition System
JET 50/100 series
Green
Blue/Yellow
Black/Red
Black/Yellow
Black/White
JET EURO 50/100 series
Black/Yellow
Blue/Yellow
Green
Black/Blue
Black
Red
15-10
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15. ELECTRICAL EQUIPMENT
Ignition Coil Inspection
y Remove body cover.
Ignition coil
Measure the primary coil resistance
Resistance :0.19~0.23KΩ (A)→(B)
Measure the secondary coil resistance
Resistance : 8.2~9.3KΩ (A)→(C)
(A)
(C)
(B)
(D)
Remove the high voltage coil cap, and measure
its negative (-) terminal for the secondary coil
resistance.
Resistance : 3.1~3.2KΩ (A)→(D)
(A)
(B)
(C)
(D)
15-11
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15. ELECTRICAL EQUIPMENT
Electrical System Circuit Inspection
Pulse Generator/Exciting Coil
AC generator
harness connector
Remove body cover.
Disconnect alternator connector.
Resistance Measurement: (20℃)
Pulse generator coil (blue/yellow - ground):
50~200Ω
Exciting (yellow - ground): 400~800Ω
CDI Electrical System Circuit Inspection
C.D.I.
Remove body cover.
Disconnect the CDI set connector, and check its
circuit to diagnosis related ignition components.
CDI Electrical System Circuit Inspection
ITEM
Measure at:
Standard (at 20℃)
Main Switch (compatible
with JET 50/100)
Main Switch (compatible
with JET EURO 50/100)
Exciter Coil (compatible
with JET 50/100)
Black/white-green
Continuity as main switch OFF
Black/ Blue -green
Continuity (battery voltage) as
master switch ON
Black/Red-Green
400 ~800Ω
Pulse Generator
Blue/Yellow-green
50 ~200Ω
Black/yellow-green
0.21Ω±10%
Green-high voltage cable -w/o Cap
3~5KΩ
Green-high voltage cable - w/ Cap
7~12KΩ
Primary
Ignition Coil
Secondary
y If above checks are in normal but spark plug is still no spark. Then it probable causes from CDI set
or high voltage coil.
y If abnormal circuits are found in above checks, at first check all items, and then check each item
one by one.
15-12
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15. ELECTRICAL EQUIPMENT
Starting System
Starter relay
Starter Relay Inspection
Remove luggage box.
Connect both the green/yellow (-) and the
yellow/red (+) pins to battery posts directly.
If the red and red/white pins are also in
continuity, it means it is in normal.
Starter relay
Battery
Starter Motor Pinion Removal/Installation
Starter motor pinion
Remove left crankcase cover.
Remove starter motor pinion.
Install the starter motor pinion in reverse order of
removal.
Starter Motor Pinion Inspection
y Pinion, reduction gear for wear out or damage
→ replace it with new one.
y Gear journal for wear out or damage →
replace it with new one.
Check the pinion for sliding in axial direction
smoothly.
y The pinion sliding in axial direction not in
smooth → replace it with new one.
15-13
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15. ELECTRICAL EQUIPMENT
Starter Motor Removal/Disassembly
Remove body cover.
Remove bolt and oil pump control cable.
Disconnect starter motor harness connector.
Remove 2 bolts for separation starter motor and
gasket.
Remove 2 bolts for disassembly the starter
motor.
Starter motor
Connector
Armature
Motor housing
Spring
Carbon bracket
Front bracket
Armature Inspection
Check the armature for discoloration or other
damage. It may be short-circuit if dark surface
on the shifter found.
Caution
Do not clean the shifter surface with
sandpaper.
Check continuity 1) both the shifter surface and
shaft, 2) among the shifter surfaces. It can be
in continuity among the shifter surfaces, but both
the shifter surface and the shaft can not be in
continuity.
Starter Motor Re-Assembly/Installation
Re-assemble and install the starter motor in
reverse order of removal procedures.
15-14
O-ring
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15. ELECTRICAL EQUIPMENT
Oil Level Switch
Troubleshooting
Main switch
y If the oil level in oil tank is in specified level,
but the oil level indicator still goes on.
1. Remove body cover.
2. Disconnect oil gauge wire, and turn the
main switch to ON position.
Indicator light up
Fuse
Indicator
Indicator not light up
Oil level switch
Short-circuit between
indicator and oil
gauge
Malfunction of oil
gauge
Main switch
y If there is no oil in oil tank or low oil level, but
the oil level indicator still not goes on.
1. Remove body cover.
2. Disconnect oil gauge wire and connect a
jump wire among connector, and then turn
the main switch to ON position.
Indicator not light up
Indicator light up
Poor wire connection
Malfunction of oil
gauge
Fuse
Indicator
Oil level switch
3. Disconnect oil gauge connector, and
check voltage between wire and ground.
No voltage
y Open-circuit between
oil gauge and
indicator.
y Blown bulb
Voltage
Oil level switch
y Malfunction of oil
gauge
y Poor connection of oil
gauge
Removal/Installation
Remove oil tank.
Remove oil level switch from the oil tank.
Install the oil level switch in reverse order of
removal procedures.
15-15
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15. ELECTRICAL EQUIPMENT
Fuel Unit
Fuel unit
Removal/Installation
Remove 4 bolts and floor panel.
Disconnect fuel unit connector.
Remove the fuel unit plastic cap.
Turn the snap ring in CCW direction and then
remove the fuel unit.
Caution
Do not bend the float arm.
Fuel unit plastic
Install in reverse order of removal procedures.
Remark: Aligning the slot of fuel unit with the
ring of oil tank as installation, and then turn the
snap ring in CW direction until matching to the
arrow.
Float
Inspection
1.
2.
Connect the fuel unit connector.
Turn the main switch ON.
Move the float in up and down, and make
sure that the fuel indicator can be reached
to F (Full) and E (Empty) positions.
Conduct the step 2 if the needle on the fuel
indicator is not moved.
Measure the connector resistance while the
float in up and down positions.
Float position
Resistance value
Up (full)
3~10Ω
Down (empty)
90~100Ω
Check the fuel indicator if the resistance is in
normal.
Replace the fuel gauge if the resistance is
abnormal.
15-16
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15. ELECTRICAL EQUIPMENT
Switch / Horn
Remove handle covers and front cover.
Remove front inner box.
Check continuity on each switch.
The connected circles with a line are that they
should be in continuity.
Main Switch
Wire
color
Mark
Black /
White
IG
Black
BAT2
ON
Red
E
BAT1
●
●
LOCK
OFF
Green
●
●
●
●
Turn signal light switch
Wire color
Gray
Light blue
Orange
Mark
WR
R
L
R
●
●
N
L
●
●
Horn Switch
High / low beam
switch
Turn signal
switch
Horn switch
Wire color
Light green
Black
Mark
HO
BAT2
FREE
●
PUSH
●
High / low beam
switch
High/Low Beam switch
Wire color
Brown
White
Blue
Mark
HL
LO
HI
LO
(N)
HI
●
●
●
●
●
●
●
●
Turn signal
switch
Horn switch
15-17
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15. ELECTRICAL EQUIPMENT
Light Switch
Wire color
Mark
OFF
ON
Brown
HL
Yellow
CI
●
●
●
Light switch
Pink
RE
●
Start Switch
Wire color
Mark
FREE
PUSH
Yellow / Red
ST
Green
E
●
●
Start switch
Light switch
Start switch
Front / Rear Brake Light Switch
If the switch is in continuity as braking, it is in
normal. The switch is non-adjustable.
Horn
If the horn give out sound as connecting to 12V
battery, it means that it is in normal.
15-18
Horn
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15. ELECTRICAL EQUIPMENT
Bulb Replacement
Position light
Headlight/position light
JET EURO 50/100
Remove front cover.
Remove bulb seat and replace the bulb.
Install the all removed parts.
Headlight
Position light
JET 50/100
Remove front cover.
Loosen the headlight bulb stop plate and replace
the bulb.
Remove the position light bulb seat and replace
the bulb.
Install the all removed parts.
Headlight
Tail light / Brake light
Screws
Remove 3 screws and then remove tail cover
Remove 1 screw and then remove tail light lens.
Replace tail light or winker light bulb
Screw
15-19
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15. ELECTRICAL EQUIPMENT
Rear winker light
Remove rear winker lens.
Replace winker light bulb.
6 Screws
Front winker light
Remove 6 screws and then remove handle front
cover
1 Screw
Replace winker light bulb
15-20
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15. ELECTRICAL EQUIPMENT
Clock unit – JET EURO 50/100
Remove 6 screws and then remove handle front
cover
Remove 2 screws and then remove clock unit.
Clock
Handle rear cover
Meter
Remove handlebar front cover.
Take out the bulb seat from the bottom of
instrument panel.
Install the all removed parts.
15-21
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15. ELECTRICAL EQUIPMENT
Notes:
15-22
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JET 50 ELECTRICAL DIAGRAM
16. ELECTRICAL DIAGRAM
16
16-1
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16. ELECTRICAL DIAGRAM
16-2
Contents
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JET 100 ELECTRICAL DIAGRAM
16. ELECTRICAL DIAGRAM
16-3
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16. ELECTRICAL DIAGRAM
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16-4
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