SANYANG HD 125 Service manual

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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 RS-21 50 series scooter. 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 scooter, RS-21 50 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 RS-21 50 scooters. 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 ~ 10-8 FUEL SYSTEM
10
11-1 ~ 11-12 BRAKE SYSTEM
11
12-1 ~ 12-16 BODY COVER
12
13-1 ~ 13-8 STEERING/FRONT WHEEL/SUSPENSION
13
14-1 ~ 14-4 REAR WHEEL/SUSPENSION
14
15-1 ~ 15-22 ELECTRICAL EQUIPMENT
16-1 ~ 16-2 ELECTRICAL DIAGRAM
15
16
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Contents
MODEL ILLUSTRATION
BS05W SERIES
Light / Starter switch
Battery / Fuses /
C.D.I. / start relay
Oil tank cap
Fuel tank cap
Front winker light
Helmet hook
High & Low beam /
Turn signal / Horn switch
Frame number
Tail light
Head light
Seat lock
Rear winker light
Storage box
Air cleaner
Front brake lever
Rear brake lever
Ignition switch
Muffler
Engine number
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Contents
1. GENERAL INFORMATION
1
Symbols and Marks ·························· 1-1
Torque values···································1-8
General Safety ·································· 1-2
Cables and Harness Routing ··········1-10
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
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
1870 mm
Overall Width
700 mm
Overall Height
1130 mm
Wheel Base
1335 mm
Front
46 kg
Rear
62 kg
Total
108 kg
Total Weight
Weight
MODEL
Front
TELESCOPIC
Rear
UNlT SWING
Tire
Specifications
Front
100/90-12 (59J)
Rear
130/70-12 (59J)
Brake
System
Front
DISK (ψ273mm)
Rear
DRUM (ψ110mm)
Two /110 kg
Front
68 kg
Rear
150 kg
Total
218 kg
BS05W1-6
Suspension
System
PERFORMANCE
Passengers/
Max. Speed
48 km/hr Below
Climb Ability
22° Below
Primary Reduction
BELT
Secondary
Reduction
GEAR
Clutch
Centrifugal, dry type
Transmission
C.V.T.
Gasoline
Installation and
arrangement
Vertical, 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
Exhaust Pipe Position
and Direction
Right side, and Backward
Number/Arrang
ement
Single Cylinder
Lubrication System
Separated-lubrication
Exhaust
Concentration
Type
Cylinder
WEIGHT
ENGINE
SANYANG
Overall Length
Curb
Weight
DIMENSION
Make
Displacement
49.4 cc
Compression Ratio
7.2 : 1
Max. HP
2.6 kw / 6000 rpm
Max. Torque
4.2 Nm / 5500 rpm
E.E.C.
X
Ignition
C.D.I.
P.C.V.
X
Starting System
Electrical & kick
Catalytic reaction control
system
○
CO
Below 1.0 g/km
HC+Nox
Below 1.2 g/km
1-5
This chapter Contents
1. GENERAL INFORMATION
Specifications
1870 mm
Overall Width
700 mm
Overall Height
1130 mm
Wheel Base
1335 mm
Front
46 kg
Rear
62 kg
Total
108 kg
Total Weight
Weight
MODEL
Front
TELESCOPIC
Rear
UNlT SWING
Tire
Specifications
Front
100/90-12 (T/L)
Rear
130/70-12 (T/L)
Brake
System
Front
DISK (ψ273mm)
Rear
DRUM (ψ110mm)
Two /110 kg
Front
73 kg
Rear
171 kg
Total
244 kg
BS05W-A
Suspension
System
PERFORMANCE
Passengers/
Max. Speed
48 km/hr Below
Climb Ability
22° Below
Primary Reduction
BELT
Secondary
Reduction
GEAR
Clutch
Centrifugal, dry type
Transmission
C.V.T.
Gasoline
Installation and
arrangement
Vertical, below center,
incline
Fuel Used
Unleaded(92/95)
Speedometer
0 ~ 90 km/hr
Cycle/Cooling
2-stroke/forced air
cooled
Horn
93 ~ 112 dB/A
Bore
39 mm
Muffler
Expansion & Pulse Type
Stroke
41.4 mm
Exhaust Pipe Position
and Direction
Right side, and Backward
Number/Arrang
ement
Single Cylinder
Lubrication System
Separated-lubrication
Exhaust
Concentration
Type
Cylinder
WEIGHT
ENGINE
1-6
SANYANG
Overall Length
Curb
Weight
DIMENSION
Make
Displacement
49.4 cc
Compression Ratio
7.2 : 1
Max. HP
3.2 kw / 7000 rpm
Max. Torque
4.6 Nm / 6500 rpm
E.E.C.
X
Ignition
C.D.I.
P.C.V.
X
Starting System
Electrical & kick
Catalytic reaction control
system
○
CO
Below 8.0 g/km
HC+Nox
Below 4.0 g/km
This chapter Contents
1. GENERAL INFORMATION
Specifications
1870 mm
Overall Width
700 mm
Overall Height
1130 mm
Wheel Base
1335 mm
Front
46 kg
Rear
62 kg
Total
108 kg
Total Weight
Weight
MODEL
Front
TELESCOPIC
Rear
UNlT SWING
Tire
Specifications
Front
100/90-12 (59J)
Rear
130/70-12 (59J)
Brake
System
Front
DISK (ψ273mm)
Rear
DRUM (ψ110mm)
Two /110 kg
Front
68 kg
Rear
150 kg
Total
218 kg
BS05W-8
Suspension
System
PERFORMANCE
Passengers/
Max. Speed
65 km/hr Below
Climb Ability
22° Below
Primary Reduction
BELT
Secondary
Reduction
GEAR
Clutch
Centrifugal, dry type
Transmission
C.V.T.
Gasoline
Installation and
arrangement
Vertical, 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
Exhaust Pipe Position
and Direction
Right side, and Backward
Number/Arrang
ement
Single Cylinder
Lubrication System
Separated-lubrication
Exhaust
Concentration
Type
Cylinder
WEIGHT
ENGINE
SANYANG
Overall Length
Curb
Weight
DIMENSION
Make
Displacement
49.4 cc
Compression Ratio
7.2 : 1
Max. HP
2.8 kw / 6000 rpm
Max. Torque
4.6 Nm / 5000 rpm
E.E.C.
X
Ignition
C.D.I.
P.C.V.
X
Starting System
Electrical & kick
Catalytic reaction control
system
○
CO
Below 8.0 g/km
HC+Nox
Below 4.0 g/km
1-7
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 - 0.6kgf-m
5 mm Bolt
0.35 - 0.5kgf-m
6 mm Bolt, nut
0.8 - 1.2kgf-m
6 mm Bolt, SH nut
0.7 - 1.1kgf-m
8 mm Bolt, nut
1.8 - 2.5kgf-m
6 mm Flange bolt, nut
1.0 - 1.4kgf-m
10 mm Bolt, nut
3.0 - 4.0kgf-m
8 mm Flange bolt, nut
2.4 - 3.0kgf-m
12 mm Bolt, nut
5.0 - 6.0kgf-m
10 mm Flange bolt, nut
3.5 - 4.5kgf-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)
(Kgf-m)
4
6
1.0
Spark plug
1
14
1.4
Flywheel nut
1
10
3.8
Drive face nut
1
10
3.8
Driven face nut
1
28
5.5
Clutch outer nut
1
10
3.8
Drain bolt
1
8
1.3
Crankcase bolts
6
6
1.0
Item
Cylinder head bolts
1-8
Q’ty
Remarks
When engine
cooled
This chapter Contents
1. GENERAL INFORMATION
Frame
Item
Q’ty
Thread Dia.
Torque Value
(mm)
(Kgf-m)
Bolt for engine hanger (frame side)
1
10
4.5~5.5
Bolt for engine hanger (engine side)
1
12
5.0~7.0
Upper bolt for rear cushion
1
10
3.5~4.5
Under bolt for rear cushion
1
8
2.4~3.0
Nuts for exhaust pipe
2
6
1.0~1.4
Bolts for exhaust muffler
2
8
3.0~3.6
Brake hose bolts
2
10
3.0~4.0
Brake caliper mounting bolts
2
8
2.9~3.5
Nuts for brake level pivot
2
6
1.0~1.4
Bolt for brake hose clamper
1
6
0.7~1.1
Brake drain valve
1
6
0.5~0.7
Rear brake arm bolts
1
5
0.5~0.6
Front axle nut
1
12
5.0~7.0
Mounting bolt and nut for steering
handle post
1
10
4.0~5.0
Steering top cone race
1
-
0.2~0.3
Steering stem lock nut
1
-
1.0~2.0
Bolts for front brake mast cylinder
4
6
1.0~1.4
Bolt for front brake disk
3
8
4.0~4.5
Rear axle nut
1
14
11.0~13.0
Nut for rear hub
4
8
2.4~3.0
Remarks
1-9
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.
1-10
O:Correct
X:Wrong
This chapter Contents
1. GENERAL INFORMATION
Horn
Throttle cable
Main switch
c
f
g
d
e
g
c
d f
e
c: Throttle cable
d: Front brake cable
e: Rear brake cable
f: Speedometer cable
g: Speedometer and handle switch wire
1-11
This chapter Contents
1. GENERAL INFORMATION
CDI unit
Fuse
Start relay
Spark plug
Ignition coil
Battery
Fuel unit
ACG. connector
Regulator
Thermo switch unit
Oil level switch
Air injection cut valve
Thermo switch connector
Thermo switch
1-12
Power filter
unit ASS’Y
Resistor
Auto by-starter
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 hanger 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 2
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 Test2-13
Brake System Hose: ······ (Front Disc Brake Headlight Adjustment ··························2-14
Type) ·························································2-8
Steering System·····································2-10
General Information
Specification
Front: 100/90-12
Rear: 130/70-12
Tire dimension
Tire pressure at cold
Only rider
Front: 1.75kg/cm2
Rear: 2.25 kg/cm2
Front brake lever free play
10~20 mm
Rear brake lever free play
10~20 mm
Transmission oil
Recommendation
Type: HYPOID GEAR OIL
Oil: SAE #140 Quantity: 0.12L
Replacement: 0.11L
Spark plug
Recommendation
Type: NGK BR8HSA
Plug gap: 0.6~0.7mm
Driving belt width
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
2000±100 rpm
Cylinder compression pressure
7±1 kgf/cm²
2-1
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
• Remove the mounting screw from the air
cleaner cover.
• Remove the air cleaner cover.
Mounting screw X 5
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
Soap
Squeeze out remaining oil
Fuel Lines
Remove the luggage box.
Check fuel lines and replace damaged lines if
found.
Install the luggage box.
Fuel cock
Fuel line
Vacuum hose
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
100/90-12
130/70-12
Tire pressure
1.75
2.25
(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.
Wear indicator
△ Mark
Battery
Remove battery cover (3 screws).
Loosen two screws of battery band and then
remove the band. 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
Negative
Positive
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Rear Brake Free Play: (Drum Brake
Type)
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:
Brake Type)
(Front Disc
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.
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.
Master cylinder cover
Upper limit
Brake fluid
Filling Out Brake Fluid
Tighten the drain valve, and add brake fluid.
Place the diaphragm in.
Operate the brake lever so that brake fluid
contents inside the brake system hoses.
Bubbles
Draining valve
Air Bleed Operation
Connect a transparent hose to draining valve.
Hold the brake lever and open air bleeding valve.
Perform this operation alternative until there is no
air inside the brake system hoses.
Caution
Before closing the air bleed valve, do not
release the brake lever.
Added Brake Fluid
Add brake fluid to UPPER limit lever.
Recommended brake fluid: DOT3 or DOT4 WELL
RUN brake fluid.
Caution
Never mix or use dirty brake fluid to prevent
from damage brake system or reducing brake
performance.
2-8
Transparent draining hose
This chapter Contents
2. SERVICE MAINTENANCE INFORMATION
Brake Lining Wear: (Rear Drum Brake
Type)
Arrow
Replace the brake lining if the wear limit mark
“△” on the brake arm aligning with the indicator
of brake drum.
Wear limit mark
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.
Brake caliper
Brake lining
Caution
In order to maintain brake power balance, the
brake lining must be replaced with one set.
Brake disc
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 kgf-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
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
Remove the front cover.
Turn the headlamp adjustment screw to adjust
headlamp beam height. (C.W. is for increasing
beam height, and C.C.W. is for decreasing beam
height)
Reinstall the front fender.
Caution
Improper headlight beam adjustment will make
in coming driver dazzled or insufficient lighting
for safety distance.
2-14
Headlight mounting screw
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 tube
Oil Pump/Oil Tube Air Bleeding
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.
Oil tube
Caution
After bleeding the oil tube and oil pump, the oil
tube has to be conducted air bleeding operation
too.
Oil output tube
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
Removal/Installation
Remove the luggage box and seat.
Remove the body cover and right side cover.
Remove the oil input tube from oil pump, and then
drain oil to a clean container.
Oil tube
Remove the oil switch wire of the oil indicator.
Remove the mounting bolt on the oil tank right
side, and then remove the oil tank.
Oil level switch coupler
Installation in the reverse order of removal.
Air bleeding the oil tubes after installation.
Blot ×2
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:
Bolt for engine hanger (frame side)
4.5~5.5kgf-m
Bolt for engine hanger (engine side)
5.0~7.0kgf-m
Rear cushion upper mounting bolt
3.5~4.5kgf-m
Rear cushion under mounting bolt
2.4~3.0kgf-m
Exhaust pipe connection nuts
1.0~1.4kgf-m
Muffle mounting bolts
3.0~3.6kgf-m
4-1
This chapter Contents
4. ENGINE REMOVAL
Engine removal
Spark plug cap
Remove the luggage box and body cover.
Remove right and left side cover.
Remove the spark plug cap from the spark plug
section.
Remove the fuel output tube from carburetor.
Fuel output tube
Remove the vacuum tubes from inlet pipe.
Remove thermo switch coupler.
Vacuum tube
Thermo switch coupler
Remove the oil control cable from oil pump.
Remove the oil tube from oil pump and then clip
the tube.
4-2
Oil control cable
Oil tube
This chapter Contents
4. ENGINE REMOVAL
Remove the wire couplers of auto by-starter and
ACG.
Couplers
Remove the upper parts of the carburetor from its
upper side.
Carb. Upper parts
Remove air cleaner mounting bolts. (2 bolts)
Bolts
Remove rear brake cable from engine rear-lower
side.
Brake cable
4-3
This chapter Contents
4. ENGINE REMOVAL
Remove air injection cut valve tube.
Remove two exhaust pipe connection nuts.
Remove two bolts beside fan cover and exhaust
pipe.
Bolts
Support the engine and then remove cushion
under mounting bolt.
Rear cushion under
mounting bolt
Remove engine mounting nut and bolt.
Engine installation
Install in the reverse order of removal procedures.
Tighten the engine mounting and rear cushion
upper/under bolts.
Torque value:
Engine hanger bolt:
5.0kgf-m
Rear cushion upper mounting bolts:
4.0kgf-m
Rear cushion under mounting bolts:
2.7kgf-m
Exhaust pipe connection nut:
1.2kgf-m
Muffle mounting bolt:
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
Engine mounting Bolt
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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
mm
Item
Cylinder head Deformation
Piston OD
Clearance between cylinder and piston
Piston pin hole
Piston
Piston pin OD
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
RS-21 50 series
Standard value
Limit
0.100
39.030~39.045
38.935
0.040~0.050
0.100
12.002~12.008
12.030
11.994~12.000
11.970
0.002~0.014
0.030
0.100~0.250
0.400
17.05~17.015
17.025
39.000~39.015
39.050
0.100
Tighten torque value
Cylinder head
Spark plug
1.0kgf-m
1.4kgf-m
Exhaust pipe connection nut
Exhaust muffler mounting bolt
1.2kgf-m
3.3kgf-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 luggage box and 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
Bolt x 3
Cylinder Head Removal
Remove the 4 cylinder head bolts and then
remove the cylinder head.
Tightening bolts
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: 1.0kgf-m
Install spark plug
Tighten torque: 1.4kgf-m
Replace the exhaust pipe gasket with new one
and then install exhaust pipe.
Tighten exhaust pipe connection nut.
Tighten torque: 1.2kgf-m
Tighten exhaust muffler mounting bolt.
Tighten torque: 3.3kgf-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 3
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: 39.050mm
Measure the OD of piston at the 7 mm from the
bottom of the piston.
Service limit: 38.935 mm
Calculate the clearance between piston and
cylinder.
Service limit: 0.100 mm
Measure the ID of piston pin hole.
Service limit: 12.030mm
Measure the OD of piston pin.
Service limit: 11.970 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
nd
ring
Piston ring mark
Caution
The top ring and the 2nd ring can not be
changeable each other.
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 rings 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
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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.
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
Lock pin
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Contents
6. ALTERNATOR
Maintenance Information················· 6-2
Alternator Installation······················· 6-4
Alternator Removal ·························· 6-3
6
3.8kgf-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
3.8kgf-m
Tool
General tool
Rotor puller
Universal holder
Coil resistance value for the A.C. alternator
PINK~YELLOW: 0.16~0.8Ω
BLUE/YELLOW~EARTH: 50~200Ω
BLUE/YELLOW
YELLOW
PINK
6-2
3P
This chapter Contents
6. ALTERNATOR
Alternator Removal
Cooling fan cover
Remove the body cover and rear side cover.
Remove two bolts and then take out cooling fan
cover.
Bolt
Remove four bolts, and then take out the cooling
fan.
Cooling fan
Hold flywheel with universal holder.
Support the flywheel and the remove the 10 mm
nut on the flywheel.
10mm flanged nut
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
bolts, and then take out the alternator assembly.
Caution
Care to be taken for not damaging the alternator
coil.
Alternator Installation
10mm flanged nut
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: 3.8kgf-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
5.5kgf-m
7
3.8kgf-m
3.8kgf-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: 3.8kgf-m
Driven pulley: 5.5kgf-m
Clutch outer: 3.8kgf-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
Caution
Movable driven
pulley
y Pull out driven pulley to avoid it closing.
Install drive belt onto driven pulley.
7-5
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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: 3.8kgf-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
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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
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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
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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: 3.5-4.0kgf-m
Install left crankcase cover.
Nut
Drive face
7-9
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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
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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
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
Sliding pulley
Guide pin groove
Driven Pulley Bearing Inspection
Check if the inner bearing oil seal is damage.
Replace it if necessary.
Check if needle bearing is damage or too big
clearance. Replace it if necessary.
Rotate the inside of inner bearing with fingers to
check if the bearing rotation is in smooth and silent.
Check if the bearing outer parts are closed and
fixed. Replace it if necessary.
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
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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.
Remove snap clip and then push bearing forward
to other side of inner bearing.
Place new bearing onto proper position and its
sealing end should be forwarded to outside.
Apply with specified grease.
Inner ball bearing
Snap clip
Inner needle bearing
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
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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: 5.0~6.0kgf-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
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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
Driver
Re-assemble the gearbox cover and left
crankcase with special tools:
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
1.0kgf-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
Crankcase puller
Install the crankcase puller onto the right
crankcase with two (2) bolts, 6mm, as the diagram
shown.
Disassemble the right crankcase.
Right crankcase
Crankshaft Removal
Crankcase puller
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
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.
37mm
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: 1.0kgf-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
Float/Float Valve/Jet ·························10-6
Troubleshooting ······························ 10-2
Float Level Inspection ······················10-7
Throttle Valve ··································· 10-3
Carburetor Installation ·····················10-7
Carburetor Remove ························· 10-4
Reed Valve ········································10-7
Auto By-Starter ································ 10-4
Air Cleaner ········································10-8
Fuel unit
Fuel cap
10
Fuel tank
Air hose
Fuel tube
Fuel filter
Carburetor
Vacuum tube
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
RS-21 50
15 mm
8.8±1.0mm
1 3/8
2000±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
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10. FUEL SYSTEM
Carburetor Remove
Connection band
Remove the air cleaner.
2 bolts
Disconnect the auto by-starter and thermo
switch connectors.
Thermo switch
connector
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
Auto 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
Float 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.
Air Cleaner
Connection band
Removal/Installation
Loosen connection hose band.
Remove 2 bolts and then remove the air
cleaner.
Install in the reverse order of removal
procedures.
2 bolts
10-8
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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
1.2kgf-m
11
3.5kgf-m
0.55kgf-m
1.8kgf-m
4.5kgf-m
11-1
This chapter Contents
11. BRAKE SYSTEM
Rear Drum Brake System
11.0kgf-m
2.5kgf-m
0.55kgf-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
3.5kgf-m
3.3kgf-m
1.8kgf-m
1.0kgf-m
0.55kgf-m
4.5kgf-m
2.5kgf-m
6.0kgf-m
11.0kgf-m
0.55kgf-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: 3.3kgf-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: 1.8kgf-m
Install bolt cap.
Torque: 1.0kgf-m
Use two seal washers and hose bolts to lock the
hose and brake caliper in place.
Torque: 3.5kgf-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.
Brake hose
Caution
Kink of brake leads, hose or pipe may reduce
brake performance.
Add specified brake fluid and bleed the system.
11-9
This chapter Contents
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: 0.4-0.7kgf-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
Contents
Home page
12. Body Cover
Mechanism Illustration .....................12-1
Center Cover......................................12-8
Maintenance Information..................12-2
Body Cover ........................................12-9
Front Cover........................................12-3
Left & Right Side Foot Plates ...........12-10
Handle Cover .....................................12-4
Floor Panel.........................................12-11
Front Fender ......................................12-6
Front under Spoiler ...........................12-12
Left & Right Side-Covers ..................12-6
Inner Cover ........................................12-13
Rear Carrier .......................................12-7
Under Cover.......................................12-15
Luggage Box .....................................12-7
Rear Inner Fender..............................12-15
Mechanism Illustration
Seat
Luggage box
Rear Carrier
Rear center cover
Right body
cover
Left-body cover
Handle rear cover
Tail light set
Handle side
cover (RH)
Right foot plate
Center cover
Right side cover
12
Handle cover
Rear fender
Handle side
cover (LH)
Left foot plate
Battery cover
Inner rear fender
Floor panel
Left side cover
Inner box lid
Front cover
Under Cover
Foot mat
Inner box
Front under spoiler
Front fender
12-1
This Chapter Contents
12. Body Cover
Maintenance Information
Body covers disassemble sequence:
Handle Rear Cover
Front cover
Luggage box & seat
Handle Left / right side
cover
Front fender
Center cover
Handle front cover
Left/right side-covers
Rear carrier
Front under Spoiler
Body cover
Inner box
Rear fender /
Tail light set
Left/Right foot plates
Inner rear fender
Floor Panel
Under Cover
•
•
•
•
•
Be careful not to damage various covers in disassembly or re-assembly operation.
Never injure hooks molded on the body covers in disassembly or re-assembly operation.
Align the buckles on the guards with slot on the covers.
Make sure that each hook is properly installed during the assembly.
Never compact forcefully or hammer the guard and the covers during assembly.
12-2
This Chapter Contents
12. Body Cover
Front Cover
Removal
Remove the 6 mounting screws from the inside of
front inner box.
Screws x 6
Remove the front screw (screw x 1) from the front
cover.
Screw x 1
Remove the lower screw (screw x 1) from the front
cover.
Screw x 1
Remove the front light wire coupler.
Remove the front cover.
Installation
Install according to the reverse procedure of
removal.
Front light wire coupler
12-3
This Chapter Contents
12. Body Cover
Handle Cover
Removal
Remove the handle rear cover (screw x 5).
Disconnect the wire connectors of left & right
switches.
Remove the handle rear cover.
Caution
Open the hooks on the two end-section of the
handlebar cover as removing the cover. The,
remove the handlebar cover. Do not pull it
forcedly to avoid to breaking the hooks.
Screws x 5
Remove the handle front cover switch wire
coupler.
Switch wire coupler
Remove front cover and wire coupler.
Remove speedometer cable.
Remove the speedometer cable.
12-4
This Chapter Contents
12. Body Cover
Remove the handle front cover and speedometer
set. (screws x 4)
Screws x 4
Remove the speedometer cover. (screws x 3)
Disassemble the speedometer cover and the
speedometer set. (screws x 2)
Installation
Install according to the reverse procedure of
removal.
12-5
This Chapter Contents
12. Body Cover
Front Fender
Screw x 2
Removal
Remove the front fender screws. (left & right x 2)
Remove the front fender.
Installation
Install according to the reverse procedure of
removal.
Left & Right Side-Covers
Remove the mounting screws. (2 screws on left &
right each side)
Screw x 2
Remove the side cover.
Installation
Install according to the reverse procedure of
removal.
12-6
This Chapter Contents
12. Body Cover
Rear Carrier
Bolt x 4
Removal
Remove the hex-socket bolts (bolt x 4) of the rear
carrier.
Caution
Do not open the fuel tank cap as removing the
bolts so that prevent from bolts falling into the
fuel tank.
Open the fuel tank cap with key.
Remove the rear carrier.
Installation
Install according to the reverse procedure of
removal.
Luggage Box
Nuts x 2
Removal
Open the seat.
Remove the 2 mounting nuts and 2 bolts of the
luggage box.
Bolts x 2
Remove the 1 upper screw inside of the front
luggage box.
Remove the luggage box and seat upward.
Screw x 1
12-7
This Chapter Contents
12. Body Cover
Center Cover
Remove the lower 2 screws in front of the center
cover.
Screw x 2
Remove the 1 upper screw inside of the luggage
box.
Screw x 1
Take out the center cover.
Installation
Install according to the reverse procedure of
removal.
12-8
This Chapter Contents
12. Body Cover
Body Cover
Removal
Remove the rear carrier, luggage box and seat
firstly.
Remove the body cover mounting screw. (2
screws on each side)
Screws on each side
Gently split out the body cover a little bit with
hands and then lift the cover up slightly. Then,
remove the seat locker cable.
Seat locker cable
Remove the body cover.
Installation
Install according to the reverse procedure of
removal.
12-9
This Chapter Contents
12. Body Cover
Left & Right Side Foot Plates
Bolt x 1
Removal
Remove the foot plates connection screws & bolt.
(3 screws & 1 bolt on left & right each side)
Screws x 3
Remove the rear connection screws. (1 bolt on left
& right each side)
Remove side foot plates.
Installation:
Install according to the reverse procedure of
removal.
12-10
Bolt x 1
This Chapter Contents
12. Body Cover
Floor Panel
Removal
Remove the center cover, luggage box, body side
covers, and body cover firstly.
Remove the battery cover. (screws x 3)
Screw x 3
Remove the battery bracket (bolt x 2) and power
cables.
Take out the battery.
Remove the CDI and start relay.
CDI
Start relay
Remove the front mounting bolts (bolt x 2) of the
floor panel.
2 bolts
Remove the floor panel.
Installation
Install according to the reverse procedure of
removal.
12-11
This Chapter Contents
12. Body Cover
Front under Spoiler
Removal
Remove the front fender, front cover.
Remove the front fender, front brake system, and
odometer cable, as well as the front wheel.
.
Remove the inner box screw (left & right each side
x 3), and 1 screw on the left & right each side of
side cover.
Screws x 3
Remove 4 screws on the left & right each side of
side cover.
Screw x 2
Bend the frame hook slightly straight on the front
under spoiler.
Remove the front under spoiler. (4 screws)
Installation
Install according to the reverse procedure of
removal.
Screws x 4
12-12
Hook
This Chapter Contents
12. Body Cover
Inner Cover
Removal
Remove the front cover and front under spoiler
firstly.
Remove the main switch cap.
Ignition switch cap
Remove the mounting bolts (2 bolts) of floor Panel.
2 bolts
Remove 1 nut from the inner box lid.
Nut ×1
Take out the front inner box.
Installation
Install according to the reverse procedure of
removal.
12-13
This Chapter Contents
12. Body Cover
Remove the upper 1 bolt from the tail light.
Bolt x 1
Remove the rear side 2 bolts.
Bolt x 2
Tail light coupler
Remove tail light and winker light coupler.
Remove 1 bolt on the left & right each side of rear
fender.
Bolt
Remove rear fender and tail light.
Installation
Install according to the reverse procedure of
removal.
12-14
This Chapter Contents
12. Body Cover
Under Cover
Remove the under cover bolts. (left & right each
side x 2)
Bolts ×2
Remove the under cover.
Installation
Install according to the reverse procedure of
removal.
Rear Inner Fender
Remove rear fender and tail light firstly.
Remove 2 bolts, then remove the rear inner
fender.
Installation
Install according to the reverse procedure of
removal.
Bolts ×2
12-15
This Chapter Contents
12. Body Cover
NOTES:
12-16
Home page
Contents
13. Steering/Front Wheel/Front Shock Absorber
Mechanism Illustration ....................... 13-1
Front Wheel ....................................... 13-4
Precautions in Operation.................... 13-2
Front cushion.................................... 13-7
Trouble diagnosis ............................... 13-2
Front fork/steering column .............. 13-7
Steering Handle................................... 13-3
Mechanism Illustration
4.0~5.0kgf-m
1.0~2.0kgf-m
0.2~0.3kgf-m
13
2.4~3.0kgf-m
3.1~3.5kgf-m
5.0~7.0kgf-m
13-1
This Chapter Contents
13. Steering/Front Wheel/Front Shock Absorber
Precautions in Operation
General Information
• Before remove front wheel, use a jack to lift the body until front wheel free of ground, and take care
not to rotate body in reverse.
• Be careful not to allow oil or grease get on brake drum or linings.
Torque values
Front wheel axle
Steering handle nut
Steering column top cone sliding ring
Steering column lock nut
Speedometer cable nut
Front cushion: Upper nut
5.0~7.0kgf-m
4.0~5.0kgf-m
0.2~0.3kgf-m
1.0~2.0kgf-m
0.15~0.3kgf-m
2.4~3.0kgf-m
Tools
Special service tools
Steering column wrench
Bearing remover
Inner type bearing remover
Attachment, 32×35 mm
Attachment, 42×47 mm
Steering column nut wrench
Steering column top cone ring nut wrench
Trouble diagnosis
Hard steering stem
• Over tightening of steering stem lock nut
• Damaged steering stem steel ball and steering
stem bearing seat
• Insufficient tire pressure
Front wheel wobbling
• Bent wheel rim
• Loose wheel axle nut
• Poor wheel or wearing
• Too much clearance on wheel bearing
Steering stem off center
• Uneven left/right cushion
• Bend fork
• Bent front wheel/tire offset
Soft front suspension
• Front cushion spring worn out
• Oil leaking on cushion oil ring
Front suspension noise
• Bent cushion linkage
• Loosen cushion nut
13-2
This Chapter Contents
13. Steering/Front Wheel/Front Shock Absorber
Steering Handle
Master cylinder
REMOVAL
Remove handle front & rear cover and the front
cover (refer to chapter 12).
Disc Brake
Remove the 2 bolts of the brake master cylinder,
and then take out the master cylinder and the split
ring.
Caution
Do not operate the front brake lever to avoid to
pressing out the brake lining when removing
the master cylinder.
Mounting seat
Bolts
Remove throttle handle housing screw and then
remove the handle, throttle cable, and handle
upper housing & under housing.
Screw
Remove the mounting bolt of the rear brake lever
braket. (1 bolt)
Take out rear brake lever braket and lever.
With a wrench to hold the handle bolt and then
remove the nut.
Take out the handle after removed the bolt.
Installation
Install the handle according to the reverse
procedure of removal.
Apply with some grease onto the handle moving
parts when installing the throttle handle housing,
throttle handle, and throttle cable.
1 Bolt
Bolt
Nut
13-3
This Chapter Contents
13. Steering/Front Wheel/Front Shock Absorber
Front Wheel
Removal
Support body bottom and lift front wheel free of
ground.
Remove the screw, and disconnect speedometer
cable from the gear box.
Speedometer cable
Remove the wheel axle nut and pull out the axle.
Then, remove the front wheel.
Caution
Do not operate the front brake lever to avoid to
pressing out the brake lining when removing
the master cylinder.
Wheel axle nut
Inspection
Wheel axle
Set the axle in V-blocks and measure the run-out.
Service limit: 0.2 mm
Wheel axle
Wheel Rim
Place the wheel onto a rotated bracket.
Turn the wheel with hand and measure its wobble
value with a dial gauge.
Service limit:
Radial : 2.0 mm
Axial : 2.0 mm
13-4
This Chapter Contents
13. Steering/Front Wheel/Front Shock Absorber
Bearing
Disassembly
Remove the left axle ring and dust seal.
Remove the dust seal on the right side of
speedometer gear.
Speedometer
gear dust seal
Wheel side
collar
Bearing
Dust seal
Bearing bush
Remove the bearing with the inner type bearing
remover.
Take out the bearing spacer and then remove the
other bearing.
Tool:
Inner type bearing remover
Bearing Inspection
Turn the inner race of bearing with fingers. The
bearing should be turn smoothly. Also check if the
outer collar is tightly connected to the wheel hub.
If the bearing do not turn smoothly, or if they are
too loose in the races, or damaged, then, remove
and replace the bearings with new ones.
Clearance
Clearance
Caution
The bearing must be replaced in pair.
Installation
Install the bearing according to the reverse
procedure of removal.
Apply some grease into the bearing seat of the
wheel hub.
Install the left bearing onto the seat.
Install the bearing spacer and then install the right
bearing onto the seat.
13-5
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13. Steering/Front Wheel/Front Shock Absorber
Caution
Do not install used bearing and replace the
bearing once it has been removed.
Do not the bearing in tile motion when
installing.
Tool:
C-type compressor or bearing driver
Both samples will damage bearing
Align the flange part on the speedometer gear with
the slot of wheel hub, and then install the
speedometer gear box.
Caution
Contaminated brake lining will reduce brake
performance so the brake lining, brake drum
and disc must be free of grease.
Place the front wheel between the front cushions.
Align the flange part on the speedometer gear box
with the slot of cushion stopper.
Stopper
Brake panel slot
Install the front wheel axle from right cushion side.
Install the wheel axle nut, and tighten it to
specified torque value.
Torque value: 5.0~7.0kgf-m
Connect the speedometer cable to the
speedometer gear box.
Wheel axle nut
13-6
Speedometer cable
This Chapter Contents
13. Steering/Front Wheel/Front Shock Absorber
Front cushion
Removal
Remove the front fender, front under spoiler, front
cover, and front wheel as well as front brake
components.
Remove the brake fluid hose clipper or cable
guide on the left cushion. (bolt x 1)
As for disc brake, remove the cable guide on the
right cushion. (bolt x 1)
Brake fluid hose clipper
Bolts
Remove the top connection bolt of the right
cushion. (bolts x 4)
Remove the cushion from the front fork.
Front cushion
Installation
Install the cushions according to the reverse
procedure of removal.
Align the cushion top-edge with the top-end level
of the front fork when installing the front cushion
onto the front fork. Then, tighten the nut.
Torque value: 2.4~3.0kgf-m
Front fork/steering column
Removal
Firstly, remove the handle, front wheel, front brake
set, and front cushions.
Remove the steering lock nut.
Remove the top cone race, and then remove the
steering column.
Steering lock nut
Caution
Place the steering column bearing balls into a
parts container to avoid to missing or shortage.
Steering top cone race
13-7
This Chapter Contents
13. Steering/Front Wheel/Front Shock Absorber
With a plastic hammer to tap the steering ball race
slightly, and then remove the top ball bearing race.
Remove the lower-end cone bearing race on the
frame with a punch.
Caution
Do not damage the frame and the steering
race.
Installation
Install a new top-cone bearing race onto the top of
steering column.
And then, push the lower-cone bearing seat from
bottom until to locking position.
Lower ball bearing race
Steering lock nut
Balls
Lower cone-race
Top
cone-race
Caution
Do not let the ball bearing in title motion as
installation.
Balls
Top ball bearing race
Apply with some grease onto the top & bottom
bearing balls, and then install the balls into bearing
race.
Press in a new lower cone-race onto the steering
column, and lubricate it with grease.
Install the steering column.
Lubricate the top-cone race with grease.
Drive the cone-race into the steering column until
contact with the top bearing seat no clearance.
Note, return 1/2 turn and then tighten the top cone
race to specified torque. (tighten the race around
1/4~3/8 turn more.)
Torque value: 0.2~0.3kgf-m
Caution
Do not tighten the top cone race too tight to
prevent from damage the ball bearing seat
when tightening the top cone race.
Install the steering lock nut and lock the top cone
race. Then, tighten the nut.
Torque value: 1.0~2.0kgf-m
Install the bearing seat according to the reverse
procedure of removal.
Caution
Check the steering column if it can be turned
freely and no clearance in vertical motion.
13-8
Steering lock nut
Return 1/2 turns
Locking to 1/4~3/8
turns
Top cone-race
Steering column nut
Top cone-race
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
Bolts
Remove exhaust muffler bolt (3 bolts), then
remove the muffler.
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·································· 15-12
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·································· 15-9
Bulb Replacement······························ 15-19
Head light control unit
Horn
Winker Relay
Meter
Main Switch
Horn / Winker /
Dimmer Switch
CDI Unit
Battery
Start Switch
Fuse Box
Start Relay
Spark Plug
IG. Coil
Resistor Comp
Oil Level Switch
AC. Generator
15
Thermo switch unit
Thermo switch
Power filter unit
Reg. Rec. Comp
Fuel 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
Ignition System
Item
Model
Spark plug
Ignition coil and resistance
Ignition timing
15-2
Specification
“F” mark
NGK BR8HSA (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 regulator rectifier
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 couplers
- 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 coupler 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
This chapter Contents
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
Green
Main Switch
Pink
Black
Yellow
Auto
By- starter
Red
2P
Fuse 15A
Regulator rectifier
Green/
Black
Pink
Resistor 8Ω 5W
Battery
6P
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.
Caution
Ammeter
Battery (-) terminal
Ground circuit
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
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.
Ammeter
Fuse coupler
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
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.
Voltage: under 12.3V
Headlight coupler
Auto by-starter resistor inspection
Resistance Measurement of Resistor at 20℃.
Resistor (8Ω5W) between Green/Black and
Pink: 7.0Ω~9.0Ω
Resistor
15-7
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15. ELECTRICAL EQUIPMENT
Regulator rectifier Inspection
Regulator rectifier
Remove the rear carrier.
Remove the luggage box and body cover.
Disconnect the 6P coupler of the regulator.
Item
Main switch
connection wire
Battery
connection wire
Measurement
point
Standard Value
R~B
Battery voltage (ON)
R~G
Battery voltage
Check the parts onto the abnormal wire circuit if
the measured values are not within standards.
If the part is OK, then it is the wire circuit
abnormal.
Replace the regulator if both checks are OK.
Inspection on the Charging Coil
Caution
The test can be carried out without removing
the charging coil from the engine.
At the alternator side from the regulator coupler,
measure the resistor between pink and yellow
wires.
Standard value: 0.16~0.8Ω
15-8
Regulator rectifier
Regulator
rectifier coupler
AC generator
harness coupler
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15. ELECTRICAL EQUIPMENT
Ignition System
Green
Black/Yellow
Black
CDI.
Spark plug
Fuse 15A
IG. Coil
Black/Blue
Maim Switch
Blue/Yellow
Red
Battery
15-9
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15. ELECTRICAL EQUIPMENT
Ignition Coil Inspection
IG. Coil
Remove left side cover.
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)
(B)
(C)
(D)
Remove the high voltage coil cap, and measure its
negative (-) terminal for the secondary coil
resistance.
Resistance : 3.1~3.2KΩ (A)→(D)
Electrical System Circuit Inspection
Pulse Generator/Exciting Coil
Remove body cover.
Disconnect alternator coupler.
Resistance Measurement: (20℃)
Pulse generator coil (blue/yellow - ground):
50~200Ω
Exciting (yellow - ground): 400~800Ω
15-10
AC generator
harness coupler
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15. ELECTRICAL EQUIPMENT
CDI Electrical System Circuit Inspection
CDI unit
Remove battery cover.
Disconnect the CDI unit coupler, and check its
circuit to diagnosis related ignition components.
CDI Electrical System Circuit Inspection
Measure at:
Standard (at 20℃)
Main Switch
Black/ Blue -green
Continuity (battery voltage) as
master switch ON
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
ITEM
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.
15-11
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15. ELECTRICAL EQUIPMENT
Starting System
Red
Red/White
Main switch
Fuse 15A
Red
Black
Start switch
Yellow
/Red
Starter Motor
Green
15-12
Starter relay
Stop switch
Green/
Yellow
Battery
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15. ELECTRICAL EQUIPMENT
Starter Relay Inspection
Starter relay
Remove battery cover.
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 coupler.
Remove 2 bolts for separation starter motor and
gasket.
Remove 2 bolts for disassembly the starter motor.
Starter motor
Coupler
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 coupler, and then turn the
main switch to ON position.
Indicator not light up
Indicator light up
Poor wire connection
Malfunction of oil
gauge
3. Disconnect oil gauge coupler, and check
voltage between wire and ground.
No voltage
y Open-circuit between
oil gauge and
indicator.
y Blown bulb
Fuse
Indicator
Oil level switch
Oil level switch
Voltage
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 coupler
Removal/Installation
Remove the luggage box and seat.
Remove the rear carrier.
Remove the body covers.
Disconnect the fuel unit coupler.
Turn the plastic cap in CCW direction and then
remove the fuel unit plastic cap.
Remove the fuel gauge unit.
Fuel unit
Caution
Do not damage or bend the float arm as
removing.
Install in reverse order of removal procedures.
Plastic cap
Inspection
1.
2.
Connect the fuel unit coupler.
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 coupler 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
Float
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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
Sky blue
Orange
Mark
WR
R
L
●
R
N
●
●
L
●
High / low beam
switch
Turn signal
switch
Horn Switch
Wire color
Light green
Black
Mark
HO
BAT2
●
●
FREE
PUSH
Horn switch
High / low
beam switch
Dimmer & Passing switch
Wire color
Black
White
Blue
Black
Mark
HL
LO
HI
PASS
LO
(N)
HI
PASS
●
●
●
●
●
●
●
●
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
Light red
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.
Horn
15-18
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15. ELECTRICAL EQUIPMENT
Bulb Replacement
Position light
Headlight/position light
Remove front cover.
Headlight
Remove the rubber boot.
Press down the bulb spring locker and then
remove the locker with turning it in CCW motion.
Replace the bulb with new one if necessary.
Rubber boot
Caution
y Do not touch the bulb surface with fingers
because the bulb will create hot-spot so that
let it be burnt. It has to be package with
cloth or wear glove as installing.
y Wipe the bulb with cloth to prevent from
damaged if the bulb be touched by hands.
Install the bulb in reverse order of removal.
Connect power to check if the bulb has been
installed properly after installation.
Please conduct the headlight beam adjustment job
if replace the headlight bulb.
The headlight beam adjustment
Turn the screw to right or left to adjust the high or
low beam of headlight.
Adjust Screw
Caution
This outer cover of headlight is a fixed type so
that the lamp seat will be moved only when
adjusting.
15-19
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15. ELECTRICAL EQUIPMENT
Position light
Remove the bulb seat with turning it in CCW
motion.
Position light seat
Check if the bulb is burnt or damage, and replace
it if necessary.
Front winker light
inner lens screws
Remove the light outer lens of the winker light. (2
screws)
Remove the winker light inner lens. (1 screw)
Outer lens screws
Check if the bulb is burnt or damage, and replace
it if necessary.
15-20
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15. ELECTRICAL EQUIPMENT
Tail light / Brake light
Remove the outer lens of the tail & brake light.
(screw x 2)
2 Screws
Check if the bulb is burnt or damage, and replace
it if necessary.
Rear winker light
Pry out the light cover from the preset slot onto the
lower parts of cover.
Preset slot
Check if the bulb is burnt or damage, and replace
it if necessary.
Connect power to check if the bulb has been
installed properly after installation.
15-21
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15. ELECTRICAL EQUIPMENT
Meter
Remove the front cover, and then remove the
meter wire coupler.
Remove speedometer cable.
Remove handle rear cover.
Remove handle front cover and meter. (4 screws)
4 screws
Take out the bulb seat from the bottom of
instrument panel.
Check if the bulb is burnt or damage, and replace
it if necessary.
Handle front cover and meter disassembly
Meter screws X 3
Remove meter cover and meter from handle front
cover. (5 screw)
Remove meter from meter cover. (3 screw)
Meter cover screws X 5
15-22
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16. ELECTRICAL DIAGRAM
RS-21 50 ELECTRICAL DIAGRAM
16
16-1
Home page
16. ELECTRICAL DIAGRAM
Notes:
16-2
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