SYM VS150, VS2 User Manual

VS150 / VS2

SERVICE MANUAL

FORWARD

This service manual contains the technical data of each component inspection and repair for the VS150 / VS2 motorcycle. The manual is shown with illustrations and focused on “Service Procedures”, “Operation Key Points”, and “Inspection Adjustment” so that provides technician with service guidelines.

If the style and construction of the motorcycle, VS150 / VS2, 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

VMEP COMPANY

CONTENTS

Page Content Index

3-1 ~ 3-18 4-1 ~ 4-13 5-1 ~5-8 6-1 ~ 6-12 7-1 ~ 7-8 8-1 ~ 8-14

9-1 ~ 9-8 10-1 ~10-14

11-1 ~11-10

12-1 ~ 12-8

GENERAL INFORMATION SERVICE MAINTENANCE INFORMATION LUBRICATION SYSTEM FUEL SYSTEM ENGINE REMOVAL CYLINDER HEAD/VALVE

CYLINDER/PISTON

“V” TYPE BELT DRIVING SYSTEM/KICK-STARTER

FINAL DRIVING MECHANISM ALTERNATOR

3 4 5 6 7 8

10 11

13-1 ~ 13-9 14-1 ~ 14-16 15-1 ~ 15-14

16-1 ~ 16-11 17-1 ~ 17-6

18-1 ~ 18-18 19-1 ~ 19-2

CRANKSHAFT/ CRANKCASE BODY COVER BRAKE SYSTEM

STEERING/FRONT WHEEL/SUSPENSION

REAR WHEEL/SUSPENSION ELECTRICAL EQUIPMENT

ELECTRICAL DIAGRAM

MECHANISM ILLUSTRATIONS

VS150/VS2

Light switch

Start switch

Front winker

Key set

Head light

Handle lever

Fuel cap ass’y

Fuel tank

Battery cover ass’y

Luggage box

Dimmer switch Open switch

Winker switch

Horn switch

Tail light Stop light

Air cleaner

Kick starter

HOW TO USE THIS MANUAL

This service manual describes basic information of different system parts and system inspection & service VS150 / VS2 motorcycles. In addition, please refer to the manual contents in detailed for the model you serviced in inspection and adjustment.

The first chapter covers general information and trouble diagnosis. The second chapter covers service maintenance information and special tools manual. The third to the 11th chapters cover engine and driving systems. The 12th to the 17th chapter is contained the parts set of assembly frame body and body cover. The 18th chapter is electrical equipment. The 19th chapter is wiring diagram. Please see index of content for quick having the special parts and system information.

3. GENERAL INFORMATION

Symbols and Marks............................... 3-1

General safety........................................3-2

Service Precautions..............................3-3

Specifications........................................3-9

Specifications.....................................3-10

Torque Values ....................................3-11

Troubles Diagnosis............................3-13

Parts to Be Greased...........................3-17

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 SHARK 4T is recommended.

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 SHARK 4T (SAE 20W-50 API SG) class oil. Warranty will

not cover the damage that caused by not apply with the limited engine oil. (Recommended oil: SHARK 4T oil)

SHARK gear oil serials are recommended. (SUPER HYPOID GEAR OIL #

Gear oil

Locking sealant

Oil seal

Renew

Brake fluid

Special tools

Correct

Wrong

Indication Indication of components.

Directions

150) Apply sealant, medium strength sealant should be used unless otherwise specified.

Apply with lubricant.。

Replace with a new part before installation.

Use recommended brake fluid DOT3 or WELLRUN brake fluid. Special tools

Meaning correct installation.

Meaning wrong installation.

Indicates position and operation directions

Components assembly directions each other. Indicates where the bolt installation direction, --- means that bolt cross

through the component (invisibility).

3-1

3. 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.

Hot components

Caution

Components of the engine and exhaust system can become extremely hot after engine running. They remain very hot even after the engine has been stopped for some time. When performing service work on these parts, wear insulated gloves and wait until cooling off.

Battery

Caution

‧ Battery emits explosive gases; flame is strictly

prohibited. Keep the place well ventilated when charging the battery.

‧ Battery contains sulfuric acid (electrolyte)

which can cause serious burns so be careful do not be spray on your eyes or skin. If you get battery acid on your skin, flush it off immediately with water. If you get battery acid in your eyes, flush it off immediately with water and then go to hospital to see an ophthalmologist.

‧ If you swallow it by mistake, drink a lot of

water or milk, and take some laxative such as castor oil or vegetable oil and then go to see a doctor.

‧ Keep electrolyte beyond reach of children.

Brake shoe

Do not use an 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 brake shoe or pad ash may cause disorders and cancer of the breathing system

Brake fluid

Caution

Spilling brake fluid on painted, plastic, or rubber parts may cause damage to the parts. Place a clean towel on the above-mentioned parts for protection when servicing the brake system. Keep the brake fluid beyond reach of children.

3-2

Service Precautions

y Always use with VMEP genuine parts and

recommended oils. Using non-designed parts for VMEP motorcycle may damage the motorcycle.

y 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.

y 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.

3. GENERAL INFORMATION

y Never bend or twist a control cable to prevent

unsmooth control and premature worn out.

y 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.

y 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.

y Store complex components such as

transmission parts in the proper assemble order and tie them together with a wire for ease of installation later.

y 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.

y 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.

y Note the reassemble position of the important

components before disassembling them to ensure they will be reassembled in correct dimensions (depth, distance or position).

y Components not to be reused should be

replaced when disassembled including gaskets metal seal rings, O-rings, oil seals, snap rings, and split pins.

3-3

3. GENERAL INFORMATION

y 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.

y 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.

y Remove residues of the old gasket or sealant

before reinstallation, grind with a grindstone if the contact surface has any damage.

y The ends of rubber hoses (for fuel, vacuum, or

coolant) should be pushed as far as they can go to their connections so that there is enough room below the enlarged ends for tightening the clamps.

Groove

Clamp

Connector

y Rubber and plastic boots should be properly

reinstalled to the original correct positions as designed.

y When oil seal is installed, fill the groove with

grease, install the oil seal with the name of the manufacturer facing outside, check the shaft on which the oil seal is to be installed for smoothness and for burrs that may damage the oil seal.

Manufacturer's name

3-4

Boots

y The tool should be pressed against two (inner

and outer) bearing races when removing a ball bearing. Damage may result if the tool is pressed against only one race (either inner race or outer race). In this case, the bearing should be replaced. To avoid damaging the bearing, use equal force on both races.

Both of these examples can result in bearing damage.

3. GENERAL INFORMATION

y Lubricate the rotation face with specified

lubricant on the lubrication points before assembling.

y Check if positions and operation for installed

parts is in correct and properly.

y Make sure service safety each other when

conducting by two persons.

y After service completed, make sure all

connection points is secured. Battery positive (+) cable should be connected firstly.

y And the two posts of battery have to be greased

after connected the cables.

y Make sure that the battery post caps are

located in properly after the battery posts had been serviced.

y Note that do not let parts fall down.

y Before battery removal operation, it has to

remove the battery negative (-) cable firstly. Notre tools like open-end wrench do not contact with body to prevent from circuit short and create spark.

y If fuse burned, it has to find out the cause and

solved it. And then replace with specified capacity fuse.

Capacity verification

3-5

3. GENERAL INFORMATION

y When separating a connector, it locker has to

be unlocked firstly. Then, conduct the service operation.

y Do not pull the wires as removing a connector

or wires. Hold the connector body.

y Make sure if the connector pins are bent,

extruded or loosen.

y Insert the terminal completely.

Check if the terminal is covered by the boot. Do not let boot open facing up.

y 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.

y Wire band and wire harness have to be

clamped secured properly.

y Insert the connector completely.

If there are two lockers on two connector sides, make sure the lockers are locked in properly. Check if any wire loose.

y Check if the connector is covered by the twin

connector boot completely and secured properly.

y Before terminal connection, check if the boot is

crack or the terminal is loose.

y Do not squeeze wires against the weld or its

clamp.

3-6

3. GENERAL INFORMATION

y Do not let the wire harness contact with rotating,

moving or vibrating components as routing the harness.

y Keep wire harnesses far away from the hot

parts.

Never Touch

y Protect wires or wire harnesses with electrical

tape or tube if they contact a sharp edge or corner. Thoroughly clean the surface where tape is to be applied.

y Secure the rubber boot firmly as applying it on

wire harness.

y Route wire harnesses to avoid sharp edges or

corners and also avoid the projected ends of bolts and screws.

y Route harnesses so that they neither pull too

tight nor have excessive slack.

y Never use wires or harnesses which insulation

has been broken. Wrap electrical tape around the damaged parts or replace them.

y Never clamp or squeeze the wire harness as

installing other components.

Never clamp or squeeze the wire harness

Never too tight

3-7

3. GENERAL INFORMATION

y Do not let the wire harness been twisted as

installation.

y 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.

y With sand paper to clean rust on connector

pins/terminals if found. And then conduct connection operation later.

Clean rust

y Before operating a test instrument, operator

should read the operation manual of the instrument. And then, conduct test in accordance with the instruction.

Do you know how to set the instrument to its measurement position and the insert locations of its two probes?

3-8

Specifications

MAKER VMEP MODEL HA15A6-4 (VS2)

3. GENERAL INFORMATION

Overall Length 1910 mm Front Telescopic Fork

Overall Width 740 mm

Overall Height 1125 mm Front 110 / 80 – 12 61L

Dimension

Weight

Wheel Base 1345 mm

Front 58 kg Front Disk (ψ273 mm)

Curb Weight

Passengers/Weight Two /110 kg Max. Speed Above 100 km/h

Total Weight

Type 4-Stroke Engine Clutch Centrifugal, dry type

Installation and

arrangement

Fuel Used Unlead gasoline Speedometer 0 ~ 140 km/h

Rear 75 kg

Total 133 kg

Front 88 kg

Rear 155 kg

Total 243 kg

Vertical, below center,

incline 80°

Suspension

System

Tire Specifications

Brake System

Performance

Climb Ability Below 28°

Reduction

Secondary

Reduction

Transmission C.V.T

Rear Twin Unit Swing

Rear 130 / 70 – 12 64L

Rear Drum (ψ130 mm)

Primary

Belt, 2.56 ~ 0.8

Gear

Cycle/Cooling 4-stroke/water cooled Horn 93~112 dB/A

Bore 57.4 mm Muffler Expansion & Pulse Type

Stroke 57.8 mm

Cylinder

Number/Arrange

Engine

Displacement 149.6 cm

Compression Ratio 11.2 : 1 CO Below 5.5 g/ km

Max. Torque 12.16 Nm / 6500 r.p.m E.E.C. ─

Ignition system C.D.I. electronic ignition P.C.V. ─

Starting System

ment

Max. HP 9 Kw / 8000 r.p.m

Single Cylinder Lubrication System

Kick and electrical

starter

Exhaust Pipe Position and

Direction

Exhaust

Catalytic reaction control

Solid Particulate

Concentrati

system

HC Below 1.2 g/ km

Right side, and

Backward

Forced circulation &

splashing

Yes

3-9

3. GENERAL INFORMATION

Specifications

MAKER VMEP MODEL VS3

Overall Length 1910 mm Front Telescopic Fork

Overall Width 740 mm

Overall Height 1125 mm Front 110 / 80 -12 61L

Dimension

Weight

Wheel Base 1345 mm

Front 58 kg Front Disk (ψ273 mm)

Curb Weight

Passengers/ Weight

Total Weight

Type 4-Stroke Engine Clutch Centrifugal, dry type

Installation and

arrangement

Fuel Used Unlead gasoline Speedometer 0 ~ 140 km/h

Rear 75 kg

Total 133 kg

Front 88 kg

Rear 155 kg

Total 243 kg

Vertical, below center,

incline 80°

Two/110 kg Max. Speed Above 100 km/h

Suspension System

Tire Specifications

Brake System

Performance

Reduction

Climb Ability Below 28°

Primary

Reduction

Secondary

Reduction

Transmission C.V.T.

Rear Twin Unit Swing

Rear 130 / 70 -12 64L

Rear

Drum (ψ130 mm)

Belt

Gear

Cycle/Cooling 4-Stroke/Water Cooled Horn 93~112 dB/A

Bore 52.4 mm Muffler

Stroke 57.8 mm

Cylinder

Engine

Compression Ratio 11.2 : 1 CO Below 5.5 g/km

Number /

Arrangement

Displacement 124.6 cm

Max. HP 11.1PS / 8000 rpm

Max. Torque 10.12Nm / 6500 rpm E.E.C. ─

Ignition C.D.I. P.C.V. ─

Starting System Power & Foot

Single Cylinder Lubrication System

Exhaust Pipe Position and

Direction

Solid Particulate

Exhaust

Catalytic Reaction Control

ation

Concentr

System

HC Below 1.2 g/km

Expansion & Pulse

Type

Right side, and

Backward

Forced circulation &

splashing

Yes

3-10

3. GENERAL INFORMATION

Torque Values

The torque values listed in above table are for more important tighten torque values. Please see standard values for not listed in the table.

Standard Torque Values for Reference

Type

5 mm bolt、nut 6 mm bolt、nut 8 mm bolt、nut 10 mm bolt、nut

12 mm bolt、nut

Tighten Torque

0.45~0.6kgf-m 5 mm screw 0.35~0.5kgf-m

0.8~1.2kgf-m

1.8~2.5kgf-m

3.0~4.0kgf-m

5.0~6.0kgf-m

6 mm screw、SH nut 6 mm bolt、nut 8 mm bolt、nut

10 mm bolt、nut

Type

Tighten Torque

0.7~ 1.1kgf-m

1.0 ~1.4kgf-m

2.4 ~3.0kgf-m

3.5~4.5kgf-m

Engine Torque Values

Item Q’ty Thread Dia. (mm) Torque Value(kgf-m) Remarks

Cylinder head nut 4 8 2.0~2.4 Cylinder head right bolt 2 8 2.0~2.4 Cylinder head stud bolt (inlet pipe) 2 6 0.7~1.1 Cylinder head stud bolt (EX. pipe) 2 7 0.5~1.0 Tappet adjustment hole cap bolt 6 6 1.0~1.4 Tappet adjustment screw nut 4 5 0.7~1.1 Apply oil to thread Spark plug 1 10 1.0~1.2 Carburetor insulator bolt 2 6 0.7~1.1 Cylinder stud bolt 4 8 0.7~1.1 Engine left cover bolt 7 6 1.1~1.5 Engine oil draining bolt 1 12 1.1~1.5 Engine oil strainer cap 1 30 1.3~1.7 Mission draining bolt 1 8 0.8~1.2 Mission filling bolt 1 10 0.8~1.2 Clutch driving plate nut 1 28 5.0~6.0 Clutch outer nut 1 12 5.0~6.0 Drive face nut 1 12 5.0~6.0 Flywheel nut 1 12 5.0~6.0 Crankcase bolts 7 6 0.8~1.2 Mission case bolt 7 8 2.0~2.4

3-11

3. GENERAL INFORMATION

Frame Torque Values

Item Q’ty Thread Dia. (mm) Torque Value(kgf-m) Remarks

Stopper nut for engine hanger rubber

Engine hanger nut 2 12 4.0~5.0 Engine hanger bolt 1 12 4.0~5.0 Engine connection bolt 1 10 3.5~4.5 Front wheel axle nut 1 12 5.0~7.0 Rear wheel shaft nut 1 14 10.0~12.0 Rear fork 2 8 4.0~5.0 Rear cushion upper bolt 2 10 3.5~4.5 Rear cushion under bolt 2 8 2.4~3.0 Nut for steering post 1 10 4.0~5.0 Front cushion 4 8 2.4~3.0 Brake lever nut 2 6 0.8~1.2 Nut for the rear brake arm 1 6 0.5~0.6 Front brake hose bolt 4 10 3.0~4.0 Front brake caliper bolt 4 6 3.0~3.5 Front brake disk mounting bolt 7 8 4.0~4.5 Air-bleed valve 1 5 0.5~0.6 Speedometer cable locking screw 1 5 0.15~0.3 Exhaust muffler bolt 3 8 3.2~3.8 Exhaust muffler connection nut 2 7 1.0~1.2

1 8 1.8~2.2

3-12

3. GENERAL INFORMATION

Troubles Diagnosis

A. Engine hard to start or can not be started

Check and adjustment Fault condition Probable causes

Loosen carburetor drain bolt to check if there is gasoline inside

the carburetor

Fuel supplied tom

carburetor sufficient

Remove spark plug, install it

into spark plug cap, and perform

a spark test against engine

ground.

Check if sparks Weak sparks, no spark at

Perform cylinder compression

pressure test.

No fuel is supplied to

carburetor

all

1. No fuel in fuel tank

2. Check if the pipes, fuel tank to carburetor and intake vacuum, are clogged.

3. Float valve clogged

4. Lines in fuel tank evaporation system clogged

5. Malfunction of fuel pump

6. Loosen or damaged fuel pump vacuum hose

7. Fuel filter clogged

1. Malfunction of spark plug

2. Spark plug foul

3. Malfunction of CDI set

4. Malfunction of AC generator

5. Ignition coil is in open or short circuit

6. Ignition coil leads open or short circuit

7. Malfunction of main switch

Cylinder compression

pressure normal

Re-start by following the starting

procedures

No ignition There are some signs of

Remove the spark plug again

and check it.

Dry spark plug Wet spark plug

Remove carburetor after 30

minutes and connect a hose

onto fuel rich circuit. Then blow

the hose with air

Low compression

pressure or no pressure

ignition, nut engine can

not be started

1. Piston ring seized

2. Malfunction of cylinder valves

3. Worn cylinder and piston ring

4. Cylinder gasket leak

5. Sand hole in compression parts

1. Malfunction of throttle valve operation

2. Air sucked into intake manifold

3. Incorrect ignition timing

1. Fuel level in carburetor too high

2. Malfunction of throttle valve operation

3. Throttle valve opening too wide

Blowing in normal Blowing clogged

1. Malfunction of automatic by- starter

3-13

3. 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.

Check ignition timing (Using

ignition lamp)

Ignition timing correct Incorrect ignition timing

Check cylinder compression

pressure (using compression

pressure gauge)

Compression pressure

correct

Check if carburetor jet is

clogged

Engine speed can not be

increased.

No compression pressure

1. Air cleaner clogged

2. Poor fuel supply

3. Lines in fuel tank evaporation system

clogged

4. Exhaust pipe clogged

5. Fuel nozzle clogged in carburetor.

6. Fuel nozzle clogged in carburetor.

1. Malfunction of CDI

2. Malfunction of AC alternator

Cylinder & piston ring worn out

2. Cylinder gasket leaked

3. Sand hole in compression parts

4. Valve deterioration

5. Seized piston ring

No clogged Clogged

Remove spark plug

No foul or discoloration Fouled and discoloration

Check if engine over heat

Normal Engine overheat

Continually drive in acceleration

or high speed

No knock Knock

Remove foreign

Remove dirt

2. Incorrect spark plug heat range

Piston and cylinder worn out

2. Lean mixture

Poor fuel quality

4. Too much carbon deposited in

combustion chamber

5. Ignition timing too advanced

6. Poor circuit on the cooling system

1. Too much carbon deposited in

combustion chamber

2. Lean mixture

3. Poor fuel quality

4. Ignition timing too advanced

3-14

3. 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

Adjust the air screw of

carburetor

Good Poo

Air sucked through carburetor

gasket

No air sucked Air sucked

Remove spark plug, install

spark plug into spark plug cap

and perform spark test against

engine ground

Good spark Poo

D. Engine runs sluggish (High speed)

Check and adjustment Fault condition

1. Incorrect ignition timing (malfunction of CDI or AC alternator)

1. Rich mixture (loosen the screw)

2. Lean mixture (tighten the screw)

1. Poor heat insulation gasket

2. Carburetor lock loose

3. Poor intake gasket

4. Poor carburetor O-ring

5. Vacuum hose crack

1. Spark plug fouled

2. Malfunction of CDI

3. Malfunction of AC generator

4. Malfunction of ignition coil

5. Open or short circuit in spark plug leads

6. Malfunction of main switch

Probable causes

Check ignition timing

Normal Abnormal

Check for fuel supplying system

in automatic fuel cup

Good Abnormal

Check if carburetor clogged

No clogged Clogged

1. Malfunction of CDI

2. Malfunction of AC alternator

1. Insufficient fuel in fuel tank

2. Fuel filter clogged

3. Restricted fuel tank vent

1. Cleaning

3-15

3. GENERAL INFORMATION

E. Clutch, driving and driving pulley

FAULT CONDITIONS

PROBABLE CAUSES

Engine can be started but

motorcycle can not be moved.

1. Drive belt worn out or deformation

Ramp plate of movable drive face damaged

Driving pulley spring broken

Clutch weights broken

Drive slide-shaft gear groove broken

Transmission gear damaged

Engine running and misfire as

motorcycle initial forward moving or

jumping suddenly (rear wheel rotating as engine in running)

Clutch weights spring broken

2. Clutch outer stuck with clutch weights

Connection parts in clutch and shaft worn out or burned

Poor initial driving ( Poor climbing

performance)

1. Drive belt worn out or deformation

Weight roller worn out

Movable drive face shaft worn out

Driven pulley spring deformation

Driven pulley shaft worn out

Greased in drive belt and driven face.

3-16

Parts to Be Greased

Steering shaft bearing

Acceleration cable/ Front & rear brake lever pivot

3. GENERAL INFORMATION

Seat catch

Speedometer gear/ front wheel bearing

Side stand pivot

Rear wheel bearing

Main stand pivot

3-17

3. GENERAL INFORMATION

Notes:

3-18

4. MAINTENANCE INFORMATION

Precautions in Operation······················ 4-1 Periodical Maintenance Schedule········ 4-2 Fuel Lines / Cable··································4-3 Air Cleaner··············································4-4 Spark Plug··············································4-4 Valve Clearance ····································· 4-5 Carburetor Idle Speed Adjustment······· 4-6 Ignition System······································ 4-7 Cylinder Compression Pressure ·········· 4-7 Drive Belt················································4-8 Brake System (Front Disk Brake)········· 4-8

Precautions in Operation

Specification

Fuel Tank Capacity 6000 c.c.

Capacity 1000 c.c.

Engine Oil

Change 900 c.c.

Brake Light Switch/Starting Inhibitor Switch ················································· 4-10

Headlight Beam Distance··················4-10 Clutch Disc Wear································ 4-10 Side Stand··········································· 4-11 Cushion···············································4-11 Nuts, Bolts Tightness ························ 4-11 Wheel/Tire···········································4-12 Steering Handle Top Bearing············ 4-12

Transmission Gear oil

Clearance of throttle valve 2~6 mm

Spark plug

“F” Mark in idling speed BTDC 13º / 1700 rpm

Full timing advanced BTDC 28º / 4000 rpm

Idling speed 1600±100 rpm

Cylinder compression pressure 12.0 ±0.2 kgf/cm²

Valve clearance: IN/EX 0.12 ± 0.02 mm

Tire dimension

Tire pressure (cold)

Battery 12V8Ah (MF battery) type: TTZ10S

Capacity 150 c.c.

Change 120 c.c.

Type NGK CR8E

Gap

Front 110/80-12 61L

Rear 130/70-12 64L

Single Front: 1.75 kg/cm² rear : 2.25 kg/cm²

Two persons Front: 1.75 kg/cm² rear : 2.50 kg/cm²

0.6~0.7 mm

4-1

4. MAINTENANCE INFORMATION

Periodical Maintenance Schedule

Maintenance

Code

1 2 3 4 5 6 Tire pressure 7 Battery inspection 8 Brake & free ply check

9 Steering handle check 10 Cushion operation check 11 Every screw tightening check 12 Gear oil check for leaking 13 14 15 Frame lubrication 16 Exhaust pipe 17 18 19 20 21 22

23 24 Main/side stands & springs

25 Fuel lines 26 Cushions 27 Cam chain 28

29 30

Code: I ~ Inspection, cleaning, and adjustment R ~ Replacement C ~ Cleaning (replaced if necessary) L ~ Lubrication Have your motorcycle checked, adjusted, and recorded maintenance data periodically by your SYM Authorized Dealer to maintain the motorcycle at the optimum condition

The above maintenance schedule is established by taking the monthly 1000 kilometers as a reference which ever comes first. Remarks: 1. There marks “☆” in the schedule are emission control items. According to EPA regulations, these items must be

☆Air cleaner ☆2nd air jet leaner ☆Fuel filter ☆Oil filter ☆Engine oil change

☆Spark plug check or change ☆Gear oil change

☆Ignition timing ☆emission check in Idling ☆Throttle operation ☆Engine bolt tightening ☆CVT driving device(belt) ☆CVT driving device(roller)

Lights/electrical equipment/multi-meters

☆Valve clearance ☆Crankcase evaporative control

system

☆Crankcase blow-by over-flow ☆2nd air jet system

performed normally periodical maintenance following the use r manual instructions. They are prohibited to be adjusted or repaired by unauthorized people. Otherwise, SYM is no responsible for the charge.

2. Clean or replace the air cleaner element more often when the motorcycle is operated on dusty roads or in the Heavily- polluted environment.

3. Maintenance should be performed more often if the motorcycle is frequently operated in high speed and after the motorcycle has accumulated a higher mileage.

4. Preventive maintenance

a. Ignition system－Perform maintenance and check when continuous abnormal ignition, misfire, after-burn, overheating occur. b. Carbon deposit removal－Remove carbon deposits in cylinder head, piston heads, exhaust system when power is obvious

lower. Than ever

Item

Every

300KM

1 Month

every

1,000KM

I C R I C R

I I R C C R Replacement for every 1000 km

I I

I I R R Replacement for every 5000 km

L I I I I

A I

I I I I

I R

C I I I I

I I

I I I I A

I C

Replacement for every 2000 km I I C

3 month

every

3,000KM

6 month

every

6000KM

1 year

every

12,000KM

15 month

every

14,500KM

4-2

4. MAINTENANCE INFORMATION

Fuel Lines / Cable

Remove luggage box. Remove rear carrier. Remove body covers. Check all lines, and replace it when they are deterioration, damage or leaking.

Warning

Gasoline is a low ignition material so any kind of fire is strictly prohibited as dealing it.

Acceleration Operation

Have a wide open of throttle valve as handle in any position and release it to let back original (full closed) position. Check handle if its operation is smooth. Check acceleration cable and replace it if deteriorated, twisted or damaged. Lubricate the cable if operation is not smooth Measure the throttle grip free play in its flange part.

Adjustment can be done in either end. Secondary adjustment is conducted from top side. Remove rubber boot, loosen fixing nut, and then adjust it by turning the adjustment nut.

Primary adjustment is conducted from bottom side. Loosen fixing nut, and adjust by turning the adjustment nut. Tighten the fixing nut, and check acceleration operation condition.

Free play: 2~6 mm.

Fuel filter

Fuel hose

Fuel tank

Adjustment nut

Vacuum hose

Return Fuel hose

Throttle grip

Adjustment nut

Lock nut

2~6 mm

4-3

4. MAINTENANCE INFORMATION

Air Cleaner

Air Cleaner Element

Remove 6 screws from the air cleaner cover and then remove the cover.

Remove 6 screws, and then remove the air cleaner element.

Caution

The air cleaner element is made of paper so do not soap it into water or wash it with water.

Spark Plug

Remove central cover. Remove spark plug cap. Clean dirt around the spark plug hole. Remove spark plug.

Measure the spark plug gap. Spark plug gap：0.6÷0.7 mm

Carefully bend ground electrode of the plug to adjust the gap if necessary. Hold spark plug washer and install the spark plug by screwing it.

Tighten torque: 1.0~1.2kgf-m

Connect spark plug cap. Recommended spark plug: NGR CR8E

6 screws

0.6÷0.7 mm

Spark plug cap

4-4

4. MAINTENANCE INFORMATION

Valve Clearance

Caution

Checks and adjustment must be performed when the engine temperature is below 35℃.

Remove trunk. Remove central cover. Remove valve adjustment cap. Remove cylinder head side cover. Turn camshaft bolt in C.W. direction and let the “T” mark on the camshaft sprocket align with cylinder head mark so that piston is placed at TDC position in compression stroke.

Caution

Do not turn the bolt in C.C.W. direction to prevent from camshaft bolt looseness.

Valve clearance inspection and adjustment. Check & adjust valve clearance with feeler gauge.

Valve clearance (IN/EX): 0.12 ± 0.02 mm

Loosen fixing nut and turn the adjustment nut for adjustment.

Timing mark

Caution

Re-check the valve clearance after tightened the fixing nut.

4-5

4. MAINTENANCE INFORMATION

Carburetor Idle Speed Adjustment

Caution

y Inspection & adjustment for idle speed have to

be performed after all parts in engine that needed adjustment have been adjusted.

y Idle speed check and adjustment have to be

done after engine is being warm up. (It is enough that operates engine from stop to running for 10 minutes.)

Park the motorcycle with main stand and warm up engine. Connect tachometer (the wire clamp of tachometer is connected to the high tension cable). Open carburetor cover from the luggage box. Turn the throttle valve stopper screw to specified idle speed. Specified idle speed: 1600 ± 100 rpm

Ignition cable

Emission adjustment in idle speed

Warm up the engine for around 10 minutes and then conduct this adjustment.

1. Connect the tachometer onto engine.

2. Adjust the idle speed adjustment screw and let engine runs in 1600±100 rpm.

3. Insert the exhaust sampling pipe of exhaust analyzer into the front section of exhaust pipe. Adjust the air adjustment screw so that emission value in idle speed is within standard.

4. Slightly accelerate the throttle valve and release it immediately. Repeat this for 2~3 times.

5. Read engine RPM and value on the exhaust analyzer. Repeat step 2 to step 4 procedures until measured value within standard.

Emission standard CO: below 2.5~3.5%

HC: below 2000ppm

Stopper screw

Air adjustment screw

4-6

4. MAINTENANCE INFORMATION

Ignition System

Caution

y C.D.I ignition system is set by manufacturer so

it can not be adjusted.

y Ignition timing check procedure is for checking

whether CDI function is in normal or not.

Remove right side cover. Remove ignition timing hole cap located in front upper side of engine right cover. Connect tachometer and ignition lamp. Start engine. As engine in idle speed: 1600 rpm, aim at the mark “F” with the ignition lamp. Then, it is means that ignition timing is correct. Increase engine speed to 6000 rpm to check ignition advance degree. If indent is located within the ignition advance degrees, it is means that the ignition advance degree is in normal. If ignition timing is incorrect, check CDI set, pulse rotor and pulse generator. Replace it if malfunction of these parts is found.

Cylinder Compression Pressure

Warm up engine. Turn off the engine. Remove the trunk. Remove the central cover. Remove spark plug cap and spark plug. Install compression gauge. Full open the throttle valve, and rotate the engine by means of starter motor.

Caution

Rotate the engine until the reading in the gauge no more increasing. Usually, the highest pressure reading will be obtained in 4~7 seconds.

Compression pressure: 12 ± 0.2 Kg/cm²

Check following items if the pressure is too low:

y Incorrect valve clearance. y Valve leaking. y Cylinder head leaking, piston, piston ring and

cylinder worn out. If the pressure is too high, it means carbon deposits in combustion chamber or piston head.

4-7

4. MAINTENANCE INFORMATION

Drive Belt

Remove mounting bolt located under air cleaner. Remove Kick Stater Arm Ass Remove 3 bolts of the engine left side cover and the cover. Check if the belt is crack or worn out. Replace the belt if necessary or in accord with the periodical maintenance schedule to replace it.

Width limit: 19.5mm or above

3 bolts

Teeth

Width

Brake System (Front Disk Brake)

Brake System Hose

Make sure the brake hoses for corrosion or leaking oil.

Brake Fluid

Check brake fluid level in the brake fluid reservoir. If the level is lower than the LOWER limit, add brake fluid to UPPER limit. Also check brake system for leaking if low brake level found

Caution

y In order to maintain brake fluid in the reservoir

in horizontal position, do not remove the cap

until handle stop.

y Do not operate the brake lever after the cap

had been removed. Otherwise, the brake fluid

will spread out if operated the lever.

y Do not mix non-compatible brake fluid together.

Brake hose

LOWER

4-8

4. MAINTENANCE INFORMATION

Filling Out Brake Fluid

Tighten the drain valve, and add brake fluid. Operate the brake lever so that brake fluid contents inside the brake system hoses.

Air Bleed Operation

Connect a transparent hose to draining valve. Hold the brake lever and open air bleeding valve. Perform this operation alternative until there is no air inside the brake system hoses.

Caution

Before closing the air bleed valve, do not release the brake lever.

Added Brake Fluid

Add brake fluid to UPPER limit lever. Recommended brake fluid: DOT3 or DOT4 WELL RUN brake fluid.

Air bubble

Screws

Master cylinder cap

Diaphragm plate

Diaphragm

Upper

Drain valve

Caution

Never mix or use dirty brake fluid to prevent from damage brake system or reducing brake performance.

Brake Lining Wear

The indent mark on brake lining is the wear limitation. Replace the brake lining if the wear limit mark closed to the edge of brake disc.

Caution

It is not necessary to remove brake hose when replacing the brake lining.

Remove the brake clipper bolt, and take out the clipper.

Caution

Do not operate the brake lever after the clipper removed to avoid clipping the brake lining.

Pry out the brake lining with a flat driver if lining is clipped.

Caliper bolt

Transparent hose

Brake caliper

Lining

Brake disk

4-9

4. MAINTENANCE INFORMATION

Make sure the brake lining condition. Replace the lining if the brake lining wear limitation groove close to the brake disc.

Brake Lining Replacement

Compress the caliper and let the brake lining out of the caliper mounting plate. Compress the brake lining locking spring. Remove the inner brake lining firstly and then remove the outer brake lining. Compress the brake caliper at first as installation. Install the inner brake lining firstly, and then install the outer brake lining.

Caution

In order to maintain brake power balance, the brake lining must be replaced with one set.

Brake Light Switch/Starting Inhibitor Switch

The brake lamp switch is to light up brake lamp as brake applied. Make sure that electrical starter can be operated only under brake applying.

Head light Beam Distance

Turn on main switch Head light beam adjustment. Turn the headlight adjustment screw to adjust headlight beam high.

Lining

Brake lining wear limitation groove

Master cylinder

Brake switch

Caution

y To adjust the headlight beam follows related

regulations.

y Improper headlight beam adjustment will

make in coming driver dazzled or insufficient lighting.

Clutch Disc Wear

Run the motorcycle and increase throttle valve opening gradually to check clutch operation. If the motorcycle is in forward moving and shaking, check clutch disc condition. Replace it

Adjust screw

Clutch weight

Drive plate

4-10

4. MAINTENANCE INFORMATION

Side Stand

Check side stand spring for damage or looseness. Press down side stand and pull it with spring gauge. If gauge reading is over 2 kg, it means that the spring capacity is in normal. Check if side stand set is operated smoothly. Make sure that side stand is no bending or deformation.

Cushion

Warning

y Do not ride the motorcycle with poor cushion. y Looseness, wear or damage cushion will make

poor stability and drive-ability.

Front cushion

Press down the front cushion for several times to check it operation. Check if it is damage Replace relative parts if damage found. Tighten all nuts and bolts.

Side stand

Rear Cushion

Press down the front cushion for several times to check it operation. Check if it is damage Replace relative parts if damage found. Park motorcycle with main stand. Turn the rear wheel forcefully and check if engine bracket bushing worn out Replace the bushing if looseness found. Tighten all nuts and bolts.

Nuts, Bolts Tightness

Perform periodical maintenance in accord with the Periodical Maintenance Schedule Check if all bolts and nuts on the frame are tightened securely. Check all fixing pins, snap rings, hose clamps, and wire holders for security.

4-11

4. MAINTENANCE INFORMATION

Wheel/Tire

Caution

Tire pressure check should be done as cold engine.

Check if tire surface is ticked with nails, stones or other materials.

Appointed tire pressure

Tire size Front tire Rear tire

Tire pressure as cold engine (Kg/cm²)

Check if front and rear tires’ pressure is in normal. Measure tire thread depth from tire central surface. Replace the tire if the depth is not come with following specification:

Load for

under 90 Kg

Full loaded

Front tire: 1.5 mm Rear tire: 2.0 mm

1.75 2.25

1.75 2.5

Steering Handle Top Bearing

Caution

Check all wires and cables if they are interfered with the rotation of steering handle bar.

〝△〞mark

Wear Limit

Lift the front wheel out of ground. Turn handle from right to left alternative and check if turning is smoothly. If handle turning is uneven and bending, or the handle can be operated in vertical direction, then adjust the handle top bearing.

4-12

Notes:

4. MAINTENANCE INFORMATION

4-13

5. LUBRICATION SYSTEM

Precautions in Operation···················· 5-2 Troubleshooting ·································· 52 Engine Oil············································· 5-3

Press-In Lubrication

Oil Route

Con-Rod

Spray Lubrication

Engine Oil Strainer Clean···················· 5-3 Oil Pump··············································· 5-4 Gear Oil················································· 5-7

Valve Rocker Arm

Cam Shaft

Spray Lubrication

Press-In Lubrication

Oil Route

Oil through

Rotate Direction

Oil Strainer

Oil Pump

5-1

5. LUBRICATION SYSTEM

Precautions in Operation

General Information:

z This chapter contains maintenance operation

for the engine oil pump and gear oil

replacement.

Specifications

Engine oil quantity Disassembly: 1000 cc

Change: 900 cc

Oil viscosity SAE 20W-50 (Recommended

King serial oils)

Gear oil Disassembly: 150 cc

Change: 120 cc

Gear oil viscosity SAE 90 (Recommended SYM Hypoid gear oils)

Items Standard (mm) Limit (mm)

Unit: mm

Inner rotor clearance 0.15 0.20

Oil pump

Clearance between outer rotor and body 0.15~0.20 0.25 Clearance between rotor side and body 0.04~0.09 0.12

Torque value

Torque value oil strainer cap 1.5~3.0kgf-m Gear oil drain plug 1.0~1.5kgf-m Gear oil inspection bolt 1.0~1.5kgf-m Oil pump connection bolt 0.8~1.2kgf-m

Troubleshooting

Low engine oil level

y Oil leaking y Valve guide or seat worn out y Piston ring worn out

Low oil pressure

y Low engine oil level y Clogged in oil strainer, circuits or pipes y Oil pump damage

Dirty oil

y No oil change in periodical y Cylinder head gasket damage y Piston ring worn out

5-2

5. LUBRICATION SYSTEM

Engine Oil

Turn off engine, and park the motorcycle in flat surface with main stand. Check oil level with oil dipstick So not screw the dipstick into engine as checking. If oil level is nearly low level, fill out recommended oil to upper level.

Oil Change

Caution

Drain oil as engine warmed up so that make sure oil can be drained smoothly and completely.

Place a oil pan under the motorcycle, and remove oil drain bolt. After drained, make sure washer can be re-used. Install oil drain bolt.

Torque value：1.9~2.5kgf-m

Drain bolt

Engine Oil Strainer Clean

Drain engine oil out. Remove oil strainer and spring. Clean oil strainer. Check if O-ring can be re-used. Install oil strainer and spring. Install oil strainer cap.

Torque value：1.9~2.5kgf-m

Add oil to crankcase (oil viscosity SAE 20W-50) Recommended using King serial oil.

Engine oil capacity: 0.9L when replacing

Install dipstick, start the engine for running several minutes. Turn off engine, and check oil level again. Check if engine oil leaks.

Oil strainer cap

5-3

5. LUBRICATION SYSTEM

Oil Pump

Oil Pump Removal

Remove generator and starting gear. (Refer to chapter 10). Remove snap ring and take out oil pump.

Make sure that pump shaft can be rotated freely. Remove 3 bolts on the oil pump, and then remove oil pump.

Oil Pump Disassembly

Remove the screws on oil pump cover and disassemble the pump as illustration shown.

Oil Pump Inspection Check the clearance between oil pump body and outer rotor.

Limit: 0.25 mm

Clip

3 screws

5-4

5. LUBRICATION SYSTEM

Check clearance between inner and outer rotors. Limit: 0.20 mm

Check clearance between rotor side face and pump body

Limit: 0.12 mm

Oil Pump Re-assembly

Install inner and outer rotors into the pump body Align the indent on driving shaft with that of inner rotor. Install the driving shaft Install fixing pin

Install the oil pump cover and fixing pin properly

outer rotor

inner rotorpump body

3 Screw

5-5

5. LUBRICATION SYSTEM

Oil Pump Installation

Install the oil pump, and then tighten bolts.

Torque value：0.8~1.2kgf-m

Make sure that oil pump shaft can be rotated freely.

Install oil pump driving gear and then install snap ring onto oil pump shaft.

Install starting gear and generator. (Refer to chapter 10)

5-6

5. LUBRICATION SYSTEM

Gear Oil

Oil level inspection Park the motorcycle on flat surface with main stand. Turn off engine and remove oil inspection bolt.

Gear lubrication oil quantity has to be measured with measure device. If oil level is too low, add gear oil. Recommended using King series oil. Install oil inspection bolt.

Gear Oil Change

Remove oil level inspection bolt. Remove drain plug and drain oil out. Install the drain plug after drained.

Torque value: 1.0~1.4kgf-m

Make sure that the drain plug washer can be re-used. Add oil to specified quantity from the inspection hole.

Gear Oil Quantity: 120

Make sure that the bolt washer can be re-used, and install the bolt. Start engine and run engine for 2-3 minutes. Turn off engine and make sure that oil level is in correct level. Make sure that no oil leaking.

when replacing

Gear oil Inspection Bolt

Gear oil drain plug

5-7

5. LUBRICATION SYSTEM

Notes:

5-8

6. FUEL SYSTEM

Precautions in Operation....................6-2

Trouble Diagnosis...............................6-3

Carburetor removal.............................6-4

Vacuum chamber................................6-4

Air Cut-Off Valve .................................6-6

Auto By-Starter..................................6-7

Float Chamber.................................... 6-8

Fuel Tank............................................6-10

Air Cleaner..........................................6-11

6-1

6. FUEL SYSTEM

Precautions in Operation

General Information

Warning

Gasoline is a low ignition point and explosive materials, so always work in a well-ventilated place and strictly prohibit flame when working with gasoline.

Cautions

y Do not bend off throttle cable. Damaged throttle cable will make unstable drive-ability. y When disassembling fuel system parts, pay attention to O-ring position, replace with new one as

re-assembly

y There is a drain screw in the float chamber for draining residual gasoline. y Do not disassemble auto by-starter and air cut valve arbitrarily.

Specification

ITEM VS2

Carburetor diameter 22.1 mm

I.D. number VE025A

Fuel level 17.5 mm

Main injector #100

Idle injector #38

Idle speed 1600±100 rpm

Throttle handle clearance 2~6 mm

Pilot screw 2 1/2 turns

Tool Special service tools

Vacuum/air pressure pump Fuel level gauge

6-2

Trouble Diagnosis

6. FUEL SYSTEM

Poor engine start

y No fuel in fuel tank y Clogged fuel tube y Too much fuel in cylinder y No spark from spark plug(malfunction of ignition

system )

y Clogged air cleaner y Malfunction of auto by-starter y Malfunction of throttle operation

Stall after started

y Malfunction of auto by-starter y Incorrect ignition timing y Malfunction of carburetor y Dirty engine oil y Air existing in intake system y Incorrect idle speed

Rough idle

y Malfunction of ignition system y Incorrect idle speed y Malfunction of carburetor y Dirty fuel

Mixture too lean

y Clogged fuel injector y Vacuum piston stick and closed y Malfunction of float valve y Fuel level too low in float chamber y Clogged fuel tank cap vent y Clogged fuel filter y Obstructed fuel pipe y Clogged air vent hose y Air existing in intake system

Mixture too rich

y Clogged air injector y Malfunction of float valve y Fuel level too high in float chamber y Malfunction of auto by-starter y Dirty air cleaner

Intermittently misfire as acceleration

y Malfunction of ignition system

Late ignition timing

y Malfunction of ignition system y Malfunction of carburetor

Power insufficiency and fuel consuming

y Fuel system clogged y Malfunction of ignition system

6-3

6. FUEL SYSTEM

Carburetor removal

Remove the luggage box. Loosen the adjustment nut and fixing nut of throttle valve cable, and release the cable from carburetor. Disconnect automatic by-starter connector. Release the clamp strip of air cleaner.

Remove fuel pipe, vacuum hose. Release the clamp strip of carburetor insulator.

Vacuum chamber

Vacuum hose

2 Screws

Air cleaner clamp

Auto by-starter

Throttle cable

Air cleaner clamp

Fuel pipe

Removal

Loosen drain screw, and drain out residual fuel in float chamber. Remove 2 screws of vacuum chamber cover and the cover.

Remove compress spring and vacuum piston.

Spring

6-4

6. FUEL SYSTEM

Check if the vacuum piston for wear out, crack or other damage. Check if the diaphragm for damage or crack.

Installation

Install needle, spring and needle seat to vacuum piston.

Install vacuum piston to carburetor body and align the indent on the diaphragm. Install compress spring.

Install vacuum chamber cover and tighten 2 screws.

Piston

2 Screws

Needle seat

Needle

Spring

Caution

y Do not damage vacuum diaphragm. y When tightening the vacuum chamber screw,

hold down vacuum piston.

6-5

6. FUEL SYSTEM

Air Cut-Off Valve

Inspection

Disconnect vacuum hose and air vent hose from the air cut-off valve. Connect a hose from vacuum hose connector to vacuum pump. Connect air pump to air vent hose. Apply with specified vacuum to air cut-off valve.

Vacuum value: 420~500 mm-Hg

Pump compressed air from air pump to air vent hose.

Caution

The vacuum can not be over 600 mm-Hg. Or the air cut-off will be damaged.

If the valve is in normal, it will restrict air-flow. If air-flow is no restriction, replace carburetor

ssembly.

6-6

6. FUEL SYSTEM

Auto By-Starter

Inspection

Turn off engine and waiting for over 10 minutes for cooling. Check resistance across the two terminals of the auto by-starter.

Resistance value: Max. 10Ω (Measured after engine stopped for more than 10 minutes)

Replace the auto starter with a new one if resistance value exceeds standard. Remove carburetor allow it to cool off for 30 minutes. Connect a pressure tester from air pump. Connect by-starter circuit. Pump compressed air to the circuit. Replace the auto by-starter if the circuit clogged. Connect battery posts (12V) to starter’s connectors. After 5 minutes, test the by-starter circuit with compressed air. If air flows through the circuit, then, replace the starter.

Removal

Remove fixing plate screw, and then remove the plate and auto by-starter from carburetor.

Auto by– starter

Screw ×2

Valve inspection

Check if auto by-starter and valve needle for damage or wear out.

Installation

Install auto by-starter to the bottom of carburetor body. Install fixing plate to the upper groove of auto by-starter, and install its flat surface to carburetor. Install screw and tighten it.

Needle

Seal

Screw ×2

6-7

6. FUEL SYSTEM

Float Chamber

Disassembly

Remove 4 mounting screws and remove float chamber cover. Remove the float pin and float.

Checking

Check float valve and valve seat for damage, blocking. Check float valve for wearing, and check valve seat face for wear, dirt.

Caution

In case of worn out or dirt, the float valve and valve seat will not tightly close causing fuel level to increase and as a result, fuel flooding. A worn out or dirty float valve must be replaced with a new a new one.

Remove main jet, fuel needle jet holder, needle jet, slow jet, pilot screw.

Float

Needle jet

Float valve

Slow jet

Needle jet holder

Slow jet

4 Screws

Air adjustment screw

Caution

Take care not to damage jets and adjust screw.

y Before removing adjustment screw, turn it all

the way down and note the number of turns.

y Do not turn to adjust screw forcefully to avoid

damaging valve seat face.

Clean jets with cleaning fluid. Then use compressed air to blow the dirt off. Blow carburetor body passages with compressed air.

Needle jet

Main jet

6-8

6. FUEL SYSTEM

Assembly

Install main jet, fuel needle jet holder, fuel needle jet slow jet and pilot screw.

Caution

Set the pilot screw in according to number of turns noted before it was removed.

Install the float valve, float, and float pin.

Checking fuel level

Caution

y Check again to ensure float valve, float for

proper installation.

y To ensure correct measurement, position the

float meter in such a way so that float chamber face is vertical to the main jet.

Fuel level: 20.5 mm

Installation of carburetor

Install carburetor in the reverse order of removal. Following adjustments must be made after installation.

․Throttle cable adjustment. ․Idle adjustment

Pilot screw

Float gauge

Adjustment of pilot screw

Caution

y Pilot screw was set at factory, so no

adjustment is needed. Note the number of turns it takes to screw it all the way in for ease of installation.

y The main stand must be used to support the

motorcycle to perform the adjustments.

Use a tachometer when adjusting engine RPM. Screw in adjustment screw gently, then back up to standard turns.

Standard turns: 2±1/2(1 1/2~2 1/2) turns

Engine warm up, adjust the stopper screw of throttle valve to standard RPM.

Idle speed rpm: 1600 ± 100 rpm

Connect the hose of exhaust analyzer to exhaust front end. Press test key on the analyzer. Adjust the pilot screw and read CO reading on the analyzer

CO standard value: 1.0~1.5 %

Accelerate in gradual increment make sure rpm and CO values are in standard value after engine running in stable. If rpm and CO value fluctuated, repeat the procedures described above for adjusting to standard value.

Throttle cable adjust nut

Idle adjustment screw

Pilot screw

6-9

6. FUEL SYSTEM

Fuel Tank

Fuel unit removal

Open the seat. Remove the luggage box (6 bolts and 1 screw). Remove rear carrier (4 bolts).) Remove body cover. Disconnect fuel unit connector. Remove fuel unit.

Caution

․Do not bend the float arm of fuel unit ․Do not fill out too much fuel to fuel tank.

Fuel unit inspection. (Refer to electrical equipment

chapter 16)

Fuel unit installation

Install the gauge in the reverse order of removal.

Caution

Fuel unit connector

Do not forget to install the gasket of fuel unit or damage it.

Fuel tank removal

Remove the Fuel cut valve assembly and Fuel tube.

Remove fuel tank (6 screws).

Fuel cut valve

Fuel Neck tube

Installation

Install the tank in the reverse order of removal.

6-10

6. FUEL SYSTEM

Air Cleaner

Removal

Open the seat. Remove the luggage box (6 bolts and 1 screw). Loosen the clamp strip of air cleaner. Remove the Vapor hose. Remove the Air cleaner (2 bolts).

Installation

Install the tank in the reverse order of removal.

Cleaning air cleaner element

Remove air cleaner cover (6 screws).

Remove the Air cleaner element. (Screw×6) With compressed air clean dirty around the element. Replace it if it is too dirty to clean.

Clamp strip of air cleaner

6 Screws

Screw×6

Caution

The air cleaner element is made of paper so do not soap it into water or wash it with water.

6-11

6. FUEL SYSTEM

Notes:

6-12

Precautions in Operation....................7-1

7. ENGINE REMOVAL

Removal of Engine Hanger Bush.........7-6

Removal of Engine ..............................7-2

Engine Hanger removal.......................7-5

Engine Hanger Installation...................7-7

Engine Installation.................................7-7

Precautions in Operation

General Information

y The engine has to be supported with special service tools that can be lifted or adjustable. y The following parts can be serviced as engine mounted on frame. y Carburetor. y Driving pulley, driving belt, clutch, and driving disc assembly. y Final gear reduction mechanism.

Specification

Item

Replacement 900CC

Engine oil capacity

Disassembly 1000

Replacement 120CC

Gear oil capacity

Disassembly 150

Capacity

Torque Value

Engine mounting bolt 4.0~5.0kgf-m Rear cushion upper connection bolt 3.5~4.5kgf-m Rear cushion under connection bolt 2.4~3.0kgf-m Engine hanger bolt 4.0~5.0kgf-m Rear wheel axle nut 11.0~13.0kgf-m

7-1

7. ENGINE REMOVAL

Removal of Engine

Open seat and remove the luggage box (6 bolts and 1 screw). Remove rear carrier (4 bolts). Remove battery cover (2 screws). Remove battery negative (-) position. Remove battery positive (+) position. Remove tail light connector. Remove right and left body cover (2 bolts). Disconnect the auto by-starter wire connector. Disconnect A.C.G wire connectors.

Remove starter motor wire from relay.

Remove spark plug cap.

Remove fuel pipe, vacuum tube and throttle valve wire from carburetor. Loosen the screw of air cleaner duct strip, and then remove the duct.

A.C.G wire coupler

Spark plug cap

Auto by-starter & A.C.G. coupler

Starter relay

7-2

7. ENGINE REMOVAL

Remove right and left body cover. Remove right and left pillion step ass'y

Remove the fuel pump.

Remove the muffler (3 bolts, 2 nuts).

Remove rear inner fender

Fuel pump

Right side

3 bolts

2 nuts

2 Bolts

Left side

2 Bolts

7-3

7. ENGINE REMOVAL

Remove the mounting bolt of right-rear cushion. Remove the rear fork mounting bolt. (2 bolts) Remove rear wheel axle mounting nut.

Remove rear fork and collars.

Remove rear wheel.

Remove the mounting bolt of left-rear cushion.

3 Bolts Rear wheel axle nut

7-4

Left-rear cushion bolt

7. ENGINE REMOVAL

Remove the right and left side engine hanger mounting bolts and nuts, then remove engine.

Caution

․Support engine and frame separately with

special supporters to prevent from engine or frame falling down.

Engine Hanger removal

Left side

Engine hanger nut and bolt

Right side

Engine mounting nut and bolt

Remove the engine mounting bolt and nut, then remove engine hanger.

Engine mounting nut and bolt

7-5

7. ENGINE REMOVAL

Removal of Engine Hanger Bush

Check if engine hanger bush and cushion rubber bush for damage.

Pressing out

If engine hanger and the rear cushion rubber bush damaged. Then with the bush remover/presser, Ø 30mm & Ø 22mm to press the bush out, and replace it with new one. Engine hanger bush: ψ 30mm Rear cushion bush: ψ 22mm

Place the detent section of the bush remover toward the bush, and drive both the pressing ring and bolt in to press the bush out.

Pressing In

Bush

Place the flat section of the remover toward the bush, and then drive the bush, pressing ring, and bolt in to install the bush.

7-6

7. ENGINE REMOVAL

Engine Hanger Installation

Install engine hanger onto engine. Install engine mounting bolts & nuts and then tighten the nuts.

Torque value: 4.0~5.0kgf-m

Engine Installation

Check if the bush of engine hanger parts and cushion for damage. Install engine in the reverse procedures of removal.

Caution

y Pay attention of foot & hand safety as engine

installation to avoid hurting.

y Do not bend or twist wires. y Cables wires have to be routed in

accordance with normal layout.

y Small-end bearing collar has to forward to

inside (bearing) as assembling the rear fork.

Engine hanger Bolt: Torque value: 4.0~5.0kgf-m Rear cushion bolt: Torque value: upper：3.5~4.5kgf-m

under：2.4~3.0kgf-m Rear wheel axle nut: Torque value: 11.0~13.0kgf-m

Bearing collar

7-7

7. ENGINE REMOVAL

Notes:

7-8

8. CYLINDER HEAD/VALVE

Mechanism Diagram··························· 8-1 Precautions in Operation··················· 8-2 Troubleshooting·································· 8-3 Cylinder Head Removal······················ 8-4 Cylinder Head Disassembly··············· 8-6 Cylinder Head Inspection··················· 8-7

Mechanism Diagram

Valve Stem Replacement··················· 8-8 Valve Seat Inspection and Service··· 8-9 Cylinder Head Reassembly··············· 8-11 Cylinder Head Installation················· 8-12 Valve Clearance Adjustment············· 8-14

8-1

8. CYLINDER HEAD/VALVE

Precautions in Operation

General Information

y This chapter is contained maintenance and service for cylinder head, valve, and camshaft as well as

rocker arm.

y Cylinder head service can be carried out when engine is in frame.

Specification

Item Standard Limit

Compression pressure 12+/0.2 kg/cm2 ---

Intake 25.768~25.920 25.37 Camshaft Height of cam lobe

Exhaust 25.755~25.531 25.36 ID of valve rocker arm 10.000~10.015 10.10 Rocker arm OD of valve rocker arm shaft 9.972~9.987 9.910

Valve

Guide seat 5.000~5.012 5.030

valve stem and guide Free length of valve spring 35.000 31.500

Valve seat width 1.000 1.8

Tilt angle of cylinder head --- 0.05

Intake 4.970~4.980 4.900 OD of valve stem

Exhaust 4.955~4.970 4.900

Intake 0.010~0.037 0.080 Clearance between

Exhaust 0.030~0.062 0.100

Torque Value

Cylinder head bolt 2.0~2.4kgf-m Cylinder head Nut 2.0~2.4kgf-m Sealing bolt of cam chain auto-tensioner 0.8~1.2kgf-m Bolt of cam chain auto-tensioner 1.2~1.6kgf-m Cam sprocket cover bolts 0.8~1.2kgf-m Cam sprocket bolt 0.8~1.2kgf-m Spark plug 1.0~1.2kgf-m

Tools Special service tools

Valve reamer: 5.0mm Valve guide driver: 5.0mm Valve spring compressor

8-2

8. CYLINDER HEAD/VALVE

Troubleshooting

Engine performance will be effect by troubles on engine top parts. The trouble usually can be determined or by performing cylinder compression test and judging the abnormal noise generated.

Low compression pressure

1. Valve

y Improper valve adjustment y Burnt or bent valve y Improper valve timing y Valve spring damage y Valve carbon deposit.

2. Cylinder head

y Cylinder head gasket leaking or damage y Tilt or crack cylinder

3. Piston

y Piston ring worn out.

High compression pressure

y Too much carbon deposit on combustion chamber or piston head

Noise

y Improper valve clearance adjustment y Burnt valve or damaged valve spring y Camshaft wear out or damage y Chain wear out or looseness y Auto-tensioner wear out or damage y Camshaft sprocket y Rocker arm or rocker arm shaft wear out

8-3

8. CYLINDER HEAD/VALVE

Cylinder Head Removal

Remove seat, luggage box and body cover. Remove engine. (Refer to chapter 5) Remove the clamp strip bolt of carburetor, and disconnect vacuum tube from the carburetor insulator.

Remove holing cap for the adjustment bolt of cam chain tensioner, and then loosen the tensioner by turning a flat-driver in C.W direction.

Remove the side cover mounting bolts of cylinder head, and then take out the side cover. Remove

connecting tube and the

Remove the A.I.C.V Tube B, the A.I.C.V reed valve joint tube and A.I.C.V.P.B joint tube.

Remove cam sprocket bolts and then remove the sprocket by prying chain out.

the A.I.A.C Tube connect to the air cleaner

air pipe.

Vacuum tube

Clamp strip

Holing cap of adjustment bolt

Air pipe, A.I.C.V & reed

alve Comp.

2 bolts

8-4

8. CYLINDER HEAD/VALVE

Remove the 2 cylinder head mounting bolts from cylinder head right side, and then remove 4 nuts and washers from cylinder head upper side.

Remove the A.I.C.V Ass'y take out side. Remove the cylinder head as shown figure.

Remove the Reed valve Comp.

Remove 2 bolts of carburetor insulator and then take the insulator out.

Remove cylinder head gasket and 2 dowel pins. Remove chain guide. Clean up residues from the matching surfaces of cylinder and cylinder head.

4 Nuts

Cylinder head mounting

Gasket

Reed valve

Carburetor insulator

Dowel pin

Caution

y Do not damage the matching surfaces of

cylinder and cylinder head.

y Avoid residues of gasket or foreign materials

falling into crankcase as cleaning.

Chain guide

8-5

8. CYLINDER HEAD/VALVE

Cylinder Head Disassembly

Remove the holing cap of intake & exhaust valve clearance adjustment.There are 6 bolts. Then, remove the cap.

Remove the rocker arm pin stopper plate, and then screw a 5mm bolt into the rocker arm pin. Finally, remove the pin and the rocker arm.

Screw a 6 mm bolt into cam sprocket mounting bolt hole, and then pull the camshaft out.

Use a valve compressor to press the valve spring.

Stopper plate bolt

Caution

y In order to avoid loosing spring elasticity, do not

press the spring too much. Thus, press length is based on the valve cotter in which can be removed.

Special Service Tool: Valve spring remover (SYM-1471110) Valve spring installer (SYM-1471120)

Remove valve stem guide seal. Clean carbon deposits in combustion chamber. Clean residues and foreign materials on cylinder head matching surface.

Caution

Do not damage the matching surface of cylinder head.

8-6

8. CYLINDER HEAD/VALVE

Cylinder Head Inspection

Check if spark plug and valve holes are cracked. Measure cylinder head warp with a straightedge and thickness gauge.

Service limit: 0.5 mm

Valve spring free length

Measure the free length of intake and exhaust valve springs.

Service limit: 31.50 mm

Valve stem

Check if valve stems are bend, crack or burn. Check the operation condition of valve stem in valve guide, and measure & record the valve stem outer diameter.

Service Limit: IN: 4.90 mm

EX: 4.90 mm

Valve guide

Caution

Before measuring the valve guide, clean carbon deposits with reamer.

Tool: 5.0 mm valve guide reamer

Measure and record each valve guide inner diameters.

Service limit: 5.03 mm

The difference that the inner diameter of valve guide deducts the outer diameter of valve stem is the clearance between the valve stem and valve guide.

Service Limit: IN→0.08 mm

EX→0.10 mm

5.0 mm valve guide reame

8-7

8. CYLINDER HEAD/VALVE

Caution

If clearance between valve stem and valve guide exceeded service limit, check whether the new clearance that only replaces new valve guide is within service limit or not. If so, replace valve guide.

Correct it with reamer after replacement. If clearance still exceeds service limit after replaced valve guide, replace valve stem too.

Caution

It has to correct valve seat when replacing valve guide.

Valve Stem Replacement

Heat up cylinder head to 100~150℃ with heated plate or toaster.

Caution

y Do not let torch heat cylinder head directly.

Otherwise, the cylinder head may be deformed as heating it.

y Wear on a pair of glove to protect your hands

when operating.

Hold the cylinder head, and then press out old valve guide from combustion chamber side.

Valve guide driver

5.0mm

Tool: Valve guide driver: 5.0 mm

Caution

y Check if new valve guide is deformation after

pressed it in.

y When pressing in the new valve guide, cylinder

head still have to be kept in 100~150

Adjust the valve guide driver and let valve guide height is in 13 mm. Press in new valve guide from rocker arm side.

Tool: Valve guide driver: 5.0 mm

Wait for the cylinder head cooling down to room temperature, and then correct the new valve guide with reamer.

℃.

Caution

y Using cutting oil when correcting valve guide

with a reamer.

y Turn the reamer in same direction when it be

inserted or rotated.

Correct valve seat, and clean up all metal residues from cylinder head.

Tool: Valve guide reamer: 5.0 mm

Valve guide driver

5.0 mm

Valve guide reamer 5.0 mm

8-8

8. CYLINDER HEAD/VALVE

Valve Seat Inspection and Service

Clean up all carbon deposits onto intake and exhaust valves. Apply with emery slightly onto valve contact face. Grind valve seat with a rubber hose or other manual grinding tool.

Caution

y Do not let emery enter into between valve stem

and valve guide.

y Clean up the emery after corrected, and apply

with engine oil onto contact faces of valve and valve seat.

Remove the valve and check its contact face.

Caution

Replace the valve with new one if valve seal is roughness, wear out, or incomplete contacted with valve seat.

Valve seat inspection

If the valve seat is too width narrow or rough, correct it.

Valve seat width

Service limit: 1.6mm

Check the contact condition of valve seat.

Valve seat grinding

The worn valve seat has to be ground with valve seat chamfer cutter. Refer to operation manual of the valve seat chamfer cutter. Use 45° valve seat chamfer cutter to cut any rough or uneven surface from valve seat.

Caution

After valve guide had been replaced, it has to be ground with 45° valve seal chamfer cutter to correct its seat face.

Use 32° cutter to cut a quarter upper past out.

Valve seat width

Roughness

45°

Old valve seat width

32°

8-9

8. CYLINDER HEAD/VALVE

Use 60° cutter to cut a quarter lower past out. Remove the cutter and check new valve seat.

Use 45° cutter to grind the valve seat to specified width.

Caution

Make sure that all roughness and uneven faces had been ground.

Grind valve seat again if necessary.

Coat the valve seat surface with red paint. Install the valve through valve guide until the valve contacting with valve seat, slightly press down the valve but do not rotate it so that a seal track will be created on contact surface.

Contact surface too high

Old valve seat width

60°

1.0mm

Old valve seat width

45°

Caution

The contact surfaces of valve and valve seat are very important to the valve sealing capacity.

If the contact is too high grind the valve seat with 32° cutter. Then, grind the valve seat to specified width.

If the contact surface too low, grind the valve seat with 60° cutter. Then, grind the valve seat to specified width.

8-10

Contact surface too low

32°

Old valve seat width

60°

8. CYLINDER HEAD/VALVE

After the valve seat ground, coat valve seat surface with emery and then slightly press the ground surface. Clean up all emery coated onto cylinder and valve after ground.

Cylinder Head Reassembly

Lubricate valve stem with engine oil, and then insert the valve into valve guide. Install new valve stem oil seal. Install valve springs and retainers.

Caution

The closed coils of valve spring should face down to combustion chamber.

Use valve spring compressor to press valve spring.

Intake valve

Valve spring retainer

alve cotter

Exhaust valve

Valve stem seal

Valve spring

Caution

In order to avoid damaging the valve stem and the cylinder head, in the combustion chamber place a rag between the valve spring remover/installer as compressing the valve spring directly.

Special Service Tool: Valve spring remover (SYM-1471110) Valve spring installer (SYM-1471120)

Tap valve stem to make valve retainer and valve stem sealing properly.

Caution

Place and hold cylinder head on to working table so that can prevent from valve damaged.

8-11

8. CYLINDER HEAD/VALVE

Cylinder Head Installation

Install a new O-ring into the indent of carburetor insulator, and then install the insulator onto cylinder head with 2 bolts.

Install camshaft into cylinder head, and align rocker pin with rocker arm pin hole.Then, insert the rocker arm pin. Install rocker arm pin mounting plate.

Clean up all residues and foreign materials onto the matching surfaces of both cylinder and cylinder head. Install chain guide. Install 2 set pins and cylinder head gasket.

Carburetor insulator

Stopper plate bolt

Dowel pin

Caution

Do not damage the matching surfaces of cylinder and cylinder head. Avoid residues of gasket or foreign materials falling into crankcase as cleaning.

Loosen the tensioner by turning a flat-driver in C.W direction. Install cylinder head.

8-12

Chain guide

Gasket

8. CYLINDER HEAD/VALVE

Tighten 4 nuts and washers on the cylinder head upper side, and then tighten 2 cylinder head mounting bolts of cylinder head side cover. Install Reed valve and A.I.C.V Unit.

Torque value: 2.0~2.4kgf-m

Install and tighten spark plug

Torque value: 2.0~2.4kgf-m

Caution

This model is equipped with more precision 4-valve mechanism so its tighten torque can not be exceeded standard value in order to avoid causing cylinder head deformation, engine noise and leaking so that motorcycle’s performance be effected.

Install cam chain on to sprocket and align the timing mark on the sprocket with that of cylinder head. Align sprocket bolt hole with camshaft bolt hole. Tighten the sprocket mounting bolt.

4 Nuts

2 Insulator bolts

Caution

Make sure timing marks are matched.

Loosen sprocket chain tensioner and let it contact with chain plate tightly.Tighten the bolt cap of tensioner adjustment hole.

Install carburetor insulator onto carburetor and tighten clamp strip bolt. Install the vacuum hose of carburetor insulator.

Timing mark

Holing cap of adjustment bolt

Vacuum tube

Clamp strip

8-13

8. CYLINDER HEAD/VALVE

Valve Clearance Adjustment

Loosen valve clearance adjustment nuts and bolts located on valve rocker arm. Measure and adjust valve clearance with feeler gauge. After valve clearance had been adjusted to standard value, hold adjustment bolt and then tighten the Adjustment nut.

Standard Value: IN 0.12 ± 0.02 mm

EX 0.12 ± 0.02 mm

Install the valve clearance adjustment holing cap. (3 bolts)

Caution

The gasket is paper type. In case of broken, replace it and clean the Remnant gasket.

Start the engine after assembly.Remove the intake valve adjustment holing cap and make sure that engine oil flows onto the cylinder head. Stop the engine after confirmed, and then install the intake valve adjustment holing cap. Install the seat, luggage box and the body cover.

Caution

y If lubricant does not flow to cylinder head,

engine components will be worn out seriously. Thus, it must be confirmed.

y When checking lubricant flowing condition, run

the engine in idle speed. Do not accelerate engine speed.

8-14

Notes:

8. CYLINDER HEAD/VALVE

8-15

9. CYLINDER/PISTON

Mechanism Diagram······························9-1 Precautions in Operation ······················9-2 Trouble Diagnosis··································9-2 Cylinder Removal···································9-3

Mechanism Diagram

Piston Removal ··································9-4 Piston Ring Installation ·····················9-6 Piston Installation ······························9-7 Cylinder Installation···························9-7

9-1

9. CYLINDER/PISTON

Precautions in Operation

General Information

y Both cylinder and piston service cannot be carried out when engine mounted on frame.

Specification Unit：mm

Item Standard Limit

Cylinder

Piston/ Piston ring

OD of piston pin 14.960~15.000 14.930 Clearance between piston and piston pin 0.002~0.014 0.020 ID of connecting rod small-end 15.016~15.034 15.060

Cylinder ID 57.395~57.415 57.416

ID 57.400~57.415 57.416 Bend - 0.050

Clearance between piston rings

Ring-end gap

OD of piston 57.400~57.405 57.390 Clearance between piston and cylinder 0.010~0.040 0.100 ID of piston pin boss 15.002~15.008 15.040

Item Standard Limit

Top ring 0.015~0.050 0.090

ring 0.015~0.050 0.090

2 Top ring 0.150~0.300 0.500 2nd ring 0.300~0.450 0.650 Oil ring side rail 0.200~0.700 -

Piston OD of piston 57.385 ~57.405 57.300

Trouble Diagnosis

Low or Unstable Compression Pressure

y Cylinder or piston ring worn out

Knock or Noise

y Cylinder or piston ring worn out y Carbon deposits on cylinder head top-side y Piston pin hole and piston pin wear out

Smoking in Exhaust Pipe

y Piston or piston ring worn out y Piston ring installation improperly y Cylinder or piston damage

Engine Overheat

y Carbon deposits on cylinder head top side y Cooling pipe clogged or not enough in coolant

flow

9-2

9. CYLINDER/PISTON

Cylinder Removal

Remove cylinder head (refer to chapter 6). Remove cylinder.

Remove cylinder gasket and dowel pin. Cover the holes of crankcase and cam chain with a piece of cloth. Clean up all residues or foreign materials from the two matching surfaces of cylinder and crankcase.

Caution

y Soap the residues into solvent so that the

residues can be removed more easily.

Inspection

Check if the inner diameter of cylinder is wear out or damaged. In the 3 positions, top, center and bottom, of cylinder, measure the X and Y values respective in the cylinder.

Service limit: 57.85 mm

Check cylinder if warp.

Service limit: 0.05 mm

Top Center

Bottom

9-3

9. CYLINDER/PISTON

Piston Removal

Plug crankcase opening with a cleaning cloth to prevent from piston pin snap ring or other foreign materials falling into crankcase when disassembling. Hold another snap ring with pliers. Push out the piston pin from the side that not removed the snap ring.

Inspection

Measure clearance between piston ring and it grooves.

Service Limit: Top ring: 0.09 mm

ring: 0.09 mm

Remove piston rings

Check if the piston rings are damaged or its grooves are worn.

Caution

Pay attention to remove piston rings because they are fragile.

Place piston rings respective into cylinder below 20 mm of cylinder top. In order to keep the piston rings in horizontal level in cylinder, push the rings with piston.

Service Limit: Top ring: 0.50 mm

ring: 0.65 mm

9-4

9. CYLINDER/PISTON

Measure the outer diameter of piston pin by micrometer.

Service Limit: 15.04 mm

Measure the inner diameter of connecting rod small end.

Service Limit: 15.06 mm

Measure the inner diameter of piston pin hole. Service Limit: 15.04 mm Calculate clearance between piston pin and its hole.

Service Limit: 0.02 mm

Measure the outer diameter of piston.

Caution

The measurement position is 10 mm distance from piston bottom side, and 90° to piston pin.

Service limit：57.68 mm

Compare measured value with service limit to calculate the clearance between piston and cylinder.

9-5

9. CYLINDER/PISTON

Piston Ring Installation

Clean up piston top, ring groove, and piston surface. Install the piston ring onto piston carefully. Place the openings of piston ring as diagram shown.

Caution

y Do not damage piston and piston rings as installation. y All marks on the piston rings must be forwarded to up side. y Make sure that all piston rings can be rotated freely after installed.

Top ring

ring

Oil ring

Top groove

2nd groove

Oil groove

9-6

9. CYLINDER/PISTON

Piston Installation

Install piston and piston pin, and place the IN marks on the piston top side forward to intake valve. Install new piston pin snap ring.

Caution

y Do not let the opening of piston pin snap ring

align with the opening piston ring.

y Place a piece of cloth between piston and

crankcase in order to prevent snap ring from falling into crankcase as operation.

Cylinder Installation

Clean up all residues and foreign materials on the matching surface of crankcase.Pay attention to not let these residues and foreign materials fall into crankcase.

Caution

Soap the residues into solvent so that the residues can be removed more easily.

Install dowel pins and new gasket.

Coat engine oil to inside of cylinder, piston and piston rings. Care to be taken when installing piston into cylinder. Press piston rings in one by one as installation.

Caution

Do not push piston into cylinder forcefully because piston and piston rings will be damaged.。

Install cylinder head (refer to Chapter 6).

9-7

9. CYLINDER/PISTON

Notes:

9-8

Mechanism Diagram ··························· 10-1 Driving Belt···········································10-4 Maintenance Description···················· 10-2 Drive Face·············································10-6

Left Crankcase Cover ························· 10-3

10. V-BELT DRIVING SYSTEM/KICK STARTER

Clutch Outer/Driven Pulley··················10-9 Trouble Diagnosis······························· 10-2

Mechanism Diagram

3.5~4.5kgf-m

5.0~6.0kgf-m

10-1

10. V-BELT DRIVING SYSTEM/KICK STARTER

Maintenance Description

Precautions in Operation General Information

y Drive face, clutch outer, and driven pulley can be serviced on the motorcycle. y Driving belt and driving pulley must be free of grease.

Specification Unit：mm

Item Standard value (mm) Limit (mm) Driving belt width 19.500~20.500 18.500 ID of drive face boss 23.989~24.052 24.060 OD of drive face 23.960~23.974 23.940 OD of roller 17.920~18.080 17.400 ID of clutch outer 125.000~125.200 125.500 Thickness of clutch weight 4.000~4.100 1.200 Free length of driven pulley spring 168.900 163.700 OD of driven pulley 43.65~43.85 43.800 ID of drive face 39.000~39.025 39.060

Torque value

y Driven face nut: 5.0~6.0kgf-m y Clutch outer nut: 5.0~6.0kgf-m

Special Service Tools

Clutch spring compressor: SYM-2301000 Inner bearing puller: Clutch nut wrench 39 x 41 mm: Universal holder: Bearing driver:

SYM-6204002

SYM-9020200

SYM-2210100

SYM-9100100

Trouble Diagnosis

Engine can be started but motorcycle can not be moved

1. Worn driving Belt

2. Worn drive face

3. Worn or damaged clutch weight

4. Broken driven pulley

Insufficient horsepower or poor high speed performance

1. Worn driving belt

2. Insufficient spring force of driven pulley

3. Worn roller

4. Driven pulley operation un-smoothly

Shudder or misfire when driving

1. Broken clutch weight

2. Worn clutch weight

10-2

10. V-BELT DRIVING SYSTEM/KICK STARTER

Left Crankcase Cover

Left crankcase cover removal

Remove body cover. Remove kick starter arm ass'y. Remove air cleaner ass'y (2 bolts 6×25). Remove L. Cover fender Comp. Remove L. Crankcase cover (8 special bolts 6×37 ass'y).

Left crankcase cover install

Install left crankcase cover in the reverse procedures of removal.

Drive face and Driven face Comp.

L. Crank case cover Comp.

Drive face

Driven face Drive belt

Kick starter spindle Comp.

Kick return spring

10-3

10. V-BELT DRIVING SYSTEM/KICK STARTER

Driving Belt

Removal

Remove left crankcase cover Hold drive face with universal holder, and remove nut and drive face.

Hold clutch outer with universal holder, and remove nut and clutch outer.

Caution

y Using special service tools for tightening or

loosening the nut.

y Fixed rear wheel or rear brake will damage

reduction gear system.

Universal holder

Drive belt

Nut

Push the driving belt into belt groove as diagram shown so that the belt can be loosened, and then remove the driven pulley. Remove driven pulley.Do not remove driving belt. Remove the driving belt from the groove of driven pulley.

Inspection

Check the driving belt for crack or wear.Replace it if necessary. Measure the width of driving belt as diagram shown.

Service Limit: 18.5 mm

Replace the belt if exceeds the service limit.

Caution

y Using the genuine parts for replacement. y The surfaces of driving belt or pulley must be

free of grease.

y Clean up all grease or dirt before installation.

Universal holder

Belt tooth

Width

10-4

Installation

Caution

10. V-BELT DRIVING SYSTEM/KICK STARTER

Pull out driven face to avoid it closing.

Install driving belt onto driven pulley.

Install the driven pulley that has installed the belt onto drive shaft. On the drive belt another end to the movable drive face.

Install the clutch outer with universal holder, and then tighten nut to specified torque value.

Torque value: 5.0~6.0kgf-m

Driven face

Clutch outer

Nut

Universal holder

Install the drive face with universal holder, and then tighten nut to specified torque value.

Torque value: 5.0~6.0kgf-m

Universal holder

10-5

10. V-BELT DRIVING SYSTEM/KICK STARTER

Drive Face

Removal

Remove left crankcase cover. Hold generator flywheel with universal holder, and

then remove drive face nut. Remove drive face.

Remove driving belt and movable drive face comp from crankshaft.

Remove ramp plate.

Universal holder

Crankshaft

Ramp plate

Movable drive face

Drive face boss

Remove weight rollers from movable drive face.

Movable drive face

Weight roller

10-6

10. V-BELT DRIVING SYSTEM/KICK STARTER

Inspection

The weight rollers are to press movable drive face by means of centrifuge force. Thus, if weight rollers are worn out or damaged, the centrifuge force will be effect. Check if rollers are worn or damaged. Replace it if necessary. Measure each roller’s outer diameter. Replace it if exceed the service limit.

Service limit: 17.4 mm Weight: 14.0 g

Check if drive face boss is worn or damaged and replace it if necessary. Measure the outer diameter of movable drive face, and replace it if it exceed service limit.

Service limit: 23.94 mm

Measure the inner diameter of movable drive face,

Weight roller

Movable drive face

Drive face boss

and replace it if it exceed service limit.

Service limit: 24.06 mm

Reassembly/installation Install weight rollers.

Caution

The weight roller two end surfaces are not certainly same. In order to lengthen the roller life and prevented exceptionally wears the occurrence, Please end surface of the closure surface counter clockwise assembles onto movable drive face.

Install ramp plate.

Weight roller

Guide collar

Closure surface

Ramp plate

10-7

10. V-BELT DRIVING SYSTEM/KICK STARTER

With 4~5g grease spreads wipes drives in the movable drive face axis hole. Install drive face boss.

Caution

The movable drive face surface has to be free of grease. Clean it with cleaning solvent.

Install movable drive face comp. onto crankshaft.

Driven pulley installation

Press driving belt into pulley groove, and then pull the belt onto drive shaft.

Install drive face, washer and nut.

Caution

Movable drive face

Crank shaft

Press down

Drive belt

Drive face boss

Nut

Make sure that two sides of pulley surfaces have to be free of grease.Clean it with cleaning solvent.

Hold driver face with universal holder. Tighten nut to specified torque.

Torque value: 5.0~6.0kgf-m

Install left crankcase cover.

10-8

Drive face

10. V-BELT DRIVING SYSTEM/KICK STARTER

Clutch Outer/Driven Pulley

Disassembly

Remove drive belt and clutch outer/driven pulley. Install clutch spring compressor onto the pulley assembly, and operate the compressor to let the wrench be installed more easily.

Caution

Clutch nut wrench

Do not press the compressor too much.

Hold the clutch spring compressor onto bench vise, and then remove mounting nut with special service tool. Release the clutch spring compressor and remove clutch weight and spring from driven pulley.

Remove seal collar from driven pulley.

Remove guide pin, guide pin roller, and movable driven face, and then remove O-ring & oil seal seat from movable driven face.

Movable driven face

Clutch spring compressor

Seal

Collar

Guide pin

Inspection Clutch outer

Measure the inner diameter of clutch outer. Replace the clutch outer if exceed service limit.

Service limit: 125.5 mm

O-ring

Inner diameter

Guide pin

Guide pin roller

Clutch outer

10-9

10. V-BELT DRIVING SYSTEM/KICK STARTER

Clutch lining

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: 163.7 mm

Clutch lining

Clutch weight

Free length

Driven pulley

Check following items:

y If both surfaces are damaged or worn. y If guide pin groove is damaged or worn.

Replace damaged or worn components. Measure the outer diameter of driven face and the inner diameter of movable driven face. Replace it if exceeds service limit.

Service limit: Outer diameter 33.94 mm

Inner diameter 34.06 mm

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.

Outer ball bearing

Driven face

Movable driven face

Guide pin groove

Needle bearing

10-10

10. V-BELT DRIVING SYSTEM/KICK STARTER

Clutch weight Replacement

Remove snap ring and washer, and then remove clutch weight and spring from driving plate.

Caution

Some of models are equipped with one mounting plate instead of 3 snap rings.

Check if spring is damage or insufficient elasticity.

Check if shock absorption rubber is damage or deformation. Replace it if necessary. Apply with grease onto setting pins.

Spring

Clutch weight

Shock absorption rubber

Driving plate

Snap ring

Setting pin

Install new clutch weight onto setting pin and then push to the specified location. Apply with grease onto setting pins. But, the clutch block should not be greased. If so, replace it.

Caution

Grease or lubricant will damage the clutch weight and effective the block’s connection capacity.

Install the spring into groove with pliers.

Shock absorption rubber

Clutch weight

Spring

10-11

10. V-BELT DRIVING SYSTEM/KICK STARTER

Install snap ring and mounting plate onto setting pin.

Replacement of Driven Pulley Bearing

Remove inner bearing.

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 ring and then the bearing.

Remove snap ring and then push bearing forward to other side of inner bearing. Place new bearing onto proper position and its

Snap ring

Outer bearing

Clipper

Inner needle bearing

Snap ring

sealing end should be forwarded to outside. Apply with specified oil.

Install new inner bearing.

Caution

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.

Install snap ring into the groove of driving face. Align oil seal lip with bearing, and then install the new oil seal (if necessary).

Snap ring

Specified oil

Outer bearing

Bearing end

Inner bearing

10-12

10. V-BELT DRIVING SYSTEM/KICK STARTER

Installation of Clutch OUTER/Driven Pulley Assembly

Install new oil seal and O-ring onto movable driven face. Apply with specified grease to lubricate the inside of movable driven face.

Install the movable driven face onto driven face. Install the guide pin and guide pin roller.

Oil seal

O-ring

Specified grease

Movable driven face

O-ring Guide pin

Oil seal

Guide pin

Guide pin roller

Install the collar.

Install driving belt, spring and clutch weight COMP. 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 outer/driven pulley and driving belt onto driving shaft.

Collar

Clutch nut wrench

Clutch spring compressor

10-13

SYM VS150, VS2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual