KEEWAY ARN125, ARN150 Service And Maintenance Manual

1

Scooter Service and Maintenance Manual

ARN125/150

C o p y r i g h t :

K E E WAY I N T E R N AT I O N A L D E V E L O P M E N T C O . , LT D .

FEB.2006

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If you have any problems can not fnd the solution in this manual, please

fell free to contact with:

KEEWAY INTERNATIONAL DEVELOPMENT CO.,LTD

2000 SZENTENDRE U.8 KOZUZO. HUNGARY

TEL:[phone]

FAX:[phone]

EMAI: [e-mail]

Our engineer are very glad to give you the necessary assistance and

help.

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CONTENTS

Perface
A General knowledge

1. Basic term-----engine

2. Engine type—4 STROKE ENGINE，WORK CYCLES/ILLUSTRATIONS.

3. Safety for repair shop

4. Electric safety

B PRODUCT

1. Technical parameter

2. Special service tools

3. Engine and transmission system
a) Specified torque volume
b) Small but vital parts
c) Non-directional accessory-engine part
d) Engine removal and installation
e) ------ Cowling assembly

------Cylinder head assembly

-------Sub-cylinder shaft retainer assembly

----- Piston assembly

------Left crankcase cover assembly

---------Right crankcase cover assembly

--------Right crankcase

---Left crankcase parts assembly

----Crankcase assembly

----Transmission case

----Driven wheel disc clutch assembly

---- Kick starter shaft subassembly, transition gear shaft subassembly installation

---Driver wheel disc part assembly

---Exceeding clutch assembly

f) ---Power transfer chart
g) Lubricating system
h) Engine valve clearance setting
i) Cyliner pressure testing
j) Important standard dimension----engine

4. Oil----fuel system

--- Carburetor

----Carburetor removal/installation/

adjustment

5. Scooter body installation

6. Fixing torque---scooter body part
a) Front wheel assy.

4

b) Rear wheel assy.
c) Muffler assy.
d) Front fork assy.
e) Front shock absorber assy.
f) Disc brake system
g) Points for motorcycle installation
h) Important dimension for scooter body

6． Electric work/electric

a) Magneto
b) Circuit diagram
c) Electronic ignition part test
d) Battery charge circuit and testing process for battery charge
e) Signal system circuit diagram
f) Various bulbs removal and installation
g) Inspection process for electronic accessories
h) Main electric accessories specification
i) Important electric parameters

C else

7. Inspection/inspection points before using

8. Periodical service

9. Permission and forbiddance

10. Safe driving

11. Fault inspection

5

A

GENERAL

INFORMATION

6

1 ．．．． B A S I C T E R M S O F EN G I N E

A. DEAD CENTER

DEAD CENTER IS THE TWO LIMITED

POINTS, WHERE PISTON MOVES UP

AND DOWN IN LINE.
TOP DEAD CENTER－WHICH IS FARTHEST

AWAY FROM THE ROTATION CENTER OF
CRANKSHAFT.
BOTTOM DEAD CENTER－WHICH IS NEAREST
AWAY FROM THE ROTATION CENTER OF
CRANKSHAFT.

B.

B.B.

B. CYLINDER DIAMETER

CYLINDER DIAMETER CYLINDER DIAMETER

CYLINDER DIAMETER
INNDRE DIAMETER OF CYLINDER IS CALLED CYLINDER DIAMETER.
C.

C.C.

C. JOURNEY

JOURNEY JOURNEY

JOURNEY
JOURNEY IS THE DISTANCE THAT PISTON

TRAVELS. WE USUALLY CALL ONE JOURNEY FROM

TOP DEAD CENTER TO BOTTOM DEAD CENTER.

D. WORKING CAPACITY OF THE CYLINDER

THE SPACE VOLUME OF PISTON WORKING

PATH, WHICH PISTON MOVES FROM TOP DEAD
CENTER TO BOTTOM DEAD CENTER IS CALLED
WORKING CAPACITY OF CYLINDER. USUALLY THE UNIT OF CYLINDER WORKING
VOLUME IS CC(CM³), SUCH AS 75CC, 125CC, WHICH IS DIFFERENT FOR WITH DIFFERENT
ENGINE MODEL.
E. TORQUE
TORQUE IS THE FORCE OF WHIRLING OR ROTATING.
WHEN WE LOOSEN OR SCREW NUTS/ SCREWS, WE HAVE
PUT TORQUE ON IT.
IN ORDER TO DRIVE THE WHEELS, THE ENGINE PUT TORQUE,
WHICH MAY STRENGTHEN LARGER FORCE ON WHEELS
WHEN CLIMBING SLOPE.
THE TORQUE IS EQUAL THAT THE FORCE MULTIPLIES THE

7

ARM OF FORCE.
THE UNIT OF TORQUE IS KILOGRAM POWER-METER.

F. IGNITION TIMING

IN ORDER TO CONTROL THE BURNING OF
FIRE CHAMBER,, IGNITION IS TIMING.
THE IGNITION TIMING OF ENGINE QJ162FMJ
CHANGES AS FOLLOW:
WHEN ‘F’ IS 1400RMP, TOP DEAD CENTER
ADVANCES 15°..

WHEN “II” IS 4000RMP, THE TOP DEAD CENTER
ADVANCES 35°.

ENGINE CYCLE

ANY FOUR-STROKE GASOLINE ENGINE

HAS

FOUR STROKES, WHICH CONSIST OF ONE
WHOLE
OF CYCLE.

1.INLET: AIR AND MIXTURED AIR OF OIL
ARE ABSORBED INTO INLET CYLINDER.

2.COMPRESSION: MIXTURED AIR IS
COMPRESSED IN
THE CYLINDER.

3.POWER: WHEN IGNITING ENGINE, GAS
BURNS
AND EXPANDS, AND PUSH THE PISTON
MOVING
DOWN, CONNECTING ROD DIRVES ALONG
CRANKSHAFT AND OUTPUT MECHANICAL

ENERGY.

4.EXHAUST: THE EXHAUST GAS IS
EXPELLED FROM
CYLINDER.

8

2．．．．4-STROKE ENGINE CYCLE

A：：：：INLET STROKE

1、CRANKSHAFT TURNS ANTICLOCKWISE.
2、CRANKSHAFT BRINGS ALONG PISTON TO MOVE THROUGH CONNECTING ROD.
3、WHEN PISTON TRAVES FROM TOP DEAD CENTER TO BOTTOM DEAD CENTER, INLET

PORT OPENS, MIXED GAS GOES INTO CYLINDER.

B. COMPRESSION STROKE

1. CRANKSHAFT REVOLVES CONTINUALLY, BRING ALONG THE PISTON TO MOVE FROM
TOP DEAD CENTER TO BOTTOM DEAD CENTER THROUGH CONNECTING ROD.

2. MIXTURE AIR IS COMPRESSED INTO A NARROW SPACE BETWEEN CYLINDER HEAD
AND PISTON HEAD, WHICH IS CALLED BURNING CHAMBER.

CCCC：：：： POWER STROKE

POWER STROKE POWER STROKE

POWER STROKE

1. SPARK PLUG INNITES COMPRESSED MIXED GAS OF AIR AND FUEL.

2. Burning of mixed gas of air and fuel results in sudden change of temperature

and pressure in Burning chamber, and then burning gas expands, the power acted on piston
push piston to move down. The power acted on piston transfers to crankshaft through
connecting rod, which leads that crankshaft moves more fastly. Expansion of burning mixed
gas provides enough power.

D: EXHAUST STROKE

D: EXHAUST STROKE D: EXHAUST STROKE

D: EXHAUST STROKE

b) When burning gas pushes piston continually to bottom, exhaust port opens.
c) For inertia crankshaft push piston to Move toward cyliner head.
d) As piston moves toward cylinder head, burning gas is excelled from exhaust port. When piston

travels to top end, exhaust port is shut off.

9

3 ．．．． S E R V I C E W O R K S H O P S A F E T Y

WARNING

Don’t use the tool, which is damaged or easy to be
emerged, that may hurt you.

WARNING

Gasoline is flammable, and may explode in
some condition. Please never get it near smoke
or spark.

WARNING

Please often keep ground tidy and clear. Never
leak fuel on ground to avoid skidding and
damage.

WARNING

Never totate engine in close or bad ventilated
room, for exhaust contains poison gas.

WARNING

Please never clean brake hub, brake shoe and so
on with dry brush or compressed air to avoid
inhaling asbestos fibre, which may results in
cancer or other breath system disease.

WARNING

There is vitriol in storage battery, please protect
your eyes, skin and clothes. If touching vitriol
inadvertently, please wash it with water and see
doctor.

WARNING

Keep close privity with your colleague to ensure
safety.

WARNING

Please never touch brake fluid with your eyes,
otherwise wash it with water and see doctor.
Never touch brake fluid with hands for some
long time.
Never splash brake fluid on the surfaces of oil
pait parts and rubber accessories.
Never use superfluous fluid, which is exposed
in air, remaining fluid has absorbed moisture
from air, which may damage its speciality.

S E R V I C E R U L E S

1. Please use QianJiang genuine parts, and use recommended lubricant in pointed place.

2. Use special or universal tools.

3. When reassembling, use new sealed washer, O-ring, oil seal, clip, cottern pin etc.

4. Use metric bolt and nut.

5. When assembling bolt and nut, firstly tighten big diameter or central bolt and nut. Secondly tighten bolt
and nut with diagonal.

6. After assembly, check bolts and nuts tightening degree with torque wrench check if parts can move
freely.

7. Before measuring, oil and dirt should be removed; when assembly, make parts lubricated by
lubrication.

8. When parts are removed and need be reserved for a long time, please smear some lubrication on the
surface so that it is rusted and with dust deposition.

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4 . E L E C T R I C S A F E T Y

a) The relaxation of calbe is hidden trouble;

so remember to clamp each calbe to
ensure safety.

b) Don’t bend cable nip toward welding

point.

c) Band cable on oppointed position.
d) Never lay cable in the bottom of frame

or in needle angle position.

e) Never lay calbe in the end of bolts or

nuts.

f) Keep calbe away from hot source part

or some position where calbe may be
clipped when moving.

g) Lay cable along handlebar, don’t pull it

too tight or too loose, and never terrer
with other parts when ratoating in any
position.

h) Lay calbe smooth, never distort or tie it.
i) Before connecting joint, inspect if joint

is damaged and joint is stretched.

j) If calbe is layed in needle angle or

turning position, protect calbe with
adhesive tape or tube.

k) After repairing, band up it with adhesive

tape.

l) Never keep contolling calbe bended or

distorted. If controlling calbe is
damaged, you may lose stable.

11

B

PRODUCT

12

1 . S P E C I A L T O O L S L I S T

NECESSARY TOOLS TO DISASSEMBLE AND INSTALL MOTORCYCLE ENGINE AS FOLLOWS：

CODE

TOOLS CODE PURPOSE

1

2

3

4

5

6

7

8

9

10

11

12

T01

T02

T03

T04

T05

T06

T07

T08

T09

T10

T11

T12

“T”SHAPE GUIE CYLINDER

GUIDE CYLINDER TOOLS（8,10,12,13）

SCREWED ROD FOR FLY WHEEL DISASSEMBLAGE

TOOLS TO DISASSEMBLE VALVE SPRING

DISASSEMBLING TOOLS FOR OIL DRAINAGE

CYLINDER PRESSURE GAUGE

DISASSEMBLING TOOL FOR PISTON PIN

SOCKET FOR DISMOUNTING SPARK PLUGS

ELECTRIC TOOL FOR DISASSEMBLING LOCKING BOLT OF

FLY WHEEL

CULTCH CLAMP

DISASSEMBLING SCREW TOOL

GUIDE CYLINDER (17,18)

13

○1

○

2

○3

○

4

○

5

○

6

14

○

7

○

8

○

9

○

10

○

11

○

12

15

3 ．．．． E N G I N E A N D T R A N S I M I S S I O N S Y S T E M ( A ．．．． S P E C I A L T O R Q U E )

The following table liss torques of some locking accessories/fixers, which you can refer to in assembly.

NO.

NA ME QTY TORQUE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

Tapping screw for fan snail cover assy.

Lucknut for fan snail cover assy.

Tapping screw for up and down guide air cover

Lucknut for up and down guide air cover

Tapping screw and nut for ventilating air chamber of cylinder head

covr

Locknut for cylinder head cover

Locknut for double head blot on cam fixing

holder

Locknut for atmolysis chain pulling rod

Lucknut for atmolysis chain adjustor

Lucknut for cylinder head

Locknut for cylinder observing oil read

Spark plug

Double head bolt for cylinder head inlet port

Double head bolt ofr cylinder head exhaust port

Lucknut for carburetor joint

Lucknut for cooling impeller of fan

Locknut for flywheel

Locknut for magnet stator coil

Locknut for magnet motor trigger

Locknut for right crankcase cover

Oil filter cover cap

Locknut for oil pump seperating board

Locknut for oil pump sprocket

Locknut for oil pump

Locknut for oil pump cover

Locknut for super-clutch

Locknut for super clutch outside

Locknut for right crankcase

Double head bolt for left and right crankcase

Fixing bolt for motro

Locknut for left crankcase cover and line coil

Tapping screw for ventilating guide board of left

crankcase cover

Locknut for driver disc

Locknut for driven disc

Locknut for driven disc clutch

Locknut for press-board of kick starter

Locknut for transmission case cover

Locknut for flowing oil hole of transmission case

Locknut for flowing oil hole of left crank.

Locknut for position shaft of left crank

2

2

3

1

3

4

4

1

2

2

1

1

2

2

2

4

1

2

2

9

1

2

1

2

1

1

3

2

4

2

11

4

1

1

1

1

5

2

1

1

1-3N••M

10-12N•M

1-3N••M

10-12N•M

1-3N••M

10-12N•M
22-25N•M

10-12N•M
10-12N•M
10-12N•M
10-12N•M

10-15 N•M

10-12N•M
10-12N•

M

10-12N•M
10-12N•M
45-55N•M

6-8N•M
10-12N•M
10-12N•M
55-60N•M
10-12N•M

8-10N•M

10-12N•M

1-3N••M
35-40N•M
10-12N•M
10-12N•M
22-25N•M
10-12N•M
10-12N•M

3-6N•M
45-55N•M
45-55N•M
55-60N•M
10-12N•M
10-12N•M
22-25N•M
40-45N•M
22-25N•M

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b . I M P O R TA N T PA R T S

The following is detail information of vital position pin, O-ring, bearing, pin shaft and gasket of

ENGINE/UNDERPAN:

POSITION PIN-14NOS.

S.NO.

Size (mm) Qty. Description Location

1 10Фx16 2

Camshaft fixing seat and

cylinder head

Engine

2 10Фx16 2

Cylinder head and cylinder head

Engine

3 10Фx16 2 Crankcase and cylinder body Engine

4 10Фx16 2

Left and right crankcase

Engine

5 8Фx14 2 Left crankcase and gearbox Engine

6 10Фx16 2 Left crankcase and left cover Engine

7 8Фx14 2

Rignt crankcase and right

cover

Engine

O-ring-7NOS.

S.NO.

Size (mm) Qty. Description Location

1 9Фx1.6 2 Inlet and exhast valve pipe Engine

2 13.7Фx1.5 1 Atmolysis chain pulling lever Engine

3 9.5Фx1.5 1 Atmolysis chain adjustor Engine

4 18Фx3 1 Oil gauge Engine

5 30Фx3 1 Filter spring cap Engine

6 26502470 1 Starting moto Engine

Oil seal- 4NOS.

S.NO.

Size (mm) Qty. Description Location

1 27x42x7 1

Output shaft---gearbox cover

Engine

2 20x32x6 1

Output shaft—left crankcase

Engine

3 19.8x30x7 1

Crank—left crankcase

Engine

4 19.8x30x7 1

Crank—right cover

Engine

17

BEARING- 13NOS

S.NO.

Code Qty. Description Location

1

6004

1

Output shaft—gearbox cover

Engine

2

6201

1

Middle shaft—gearbox cover

Engine

3

6301

1

Output shaft—gearbox cover

Engine

4

6203

1

Output shaft—left case

Engine

5

6202

1

Middle shaft—left case

Engine

6

6204

1

Output shaft—left case

Engine

7

TM-SCO7A87

1

Left crank—left case

Engine

8

TM-SCD5ASSCS12

1

Right crank—right case

Engine

8

K28x33x14

1

Crank pin—crank connecting big rod

Engine

9

K28x32x17

1

Clutch hub—cluch gear

Engine

10

6902NSE28 x15x7

1

Driven disc—output shaft

Engine

11

HK20 x29x18RS

1

Driven disc—output shaft

Engine

12

6002

2

Camshaft—atmolysis shaft fixing holer

Engine

PINSHAFT- 2NOS

S.NO.

Size (mm) Qty. Description Location

1 5Фx6 1

Super clutch

Engine

2 4Фx6.5 1

Oil pump

Engine

GASKET- 7NOS

S.NO.

Gasket Type Qty. Location

1

Cyliner head cover Rubber endurable against oil

1 Engine

2

Cylinder head Steel

1 Engine

3

Cylindr body

Asbestos rubber endurable

against oil

1 Engine

4

Crankcase Endurable oil asbestos rubber

1 Engine

5

Right crankcase cover Endurable oil asbestos rubber

1 Engine

6

Left crankcase cover Endurable oil asbestos rubber

1 Engine

7

Atmolysis chain adjuster Endurable oil asbestos rubber

1 Engine

18

Shifting gears inforamtion

Gear down

ratio

Gear Gear qty. Gear QTY.

2.8 A

1

15 A

2

42

3.077 B

1

13 B

2

40

GEAR INFORMATION

NO. GEAR QTY. POSITION

1

Kick starter gear

38 ENGINE

2

Kick starter transition

small gear

13

ENGINE

3

Kixk starter transition big

gear

49

ENGINE

4

Crank kick starter driven

gear

20

ENGINE

5

Starting motor drvie gear

9

ENGINE

6

Electricity starter

transition gear

54/13

ENGINE

7

Clutch gear

52

ENGINE

SPROCKET INFORMATION

No.

No.No.

No. Sprocket wheel

Sprocket wheelSprocket wheel

Sprocket wheel

QTY. POSITION

1

Right crank oil pump driver
sprocket wheel

17 ENGINE

2 Oil pump sprocket wheel

19 ENGINE

3

Left crank atmolysis shaft
driver sprocket

17

ENGINE

4 Atmolysis shaft sprocket

34 ENGINE

CHAIN INFORMATION

NO. CHAIN NODE POSITION

1 ATMOLYSIS SHAFT CHAIN 90 ENGINE

2 OIL PUMP CHAIN 42 ENGINE

19

c . S PA R E PA R T S O F E N G I N E

Please read the following instruction carefully, and ensure spare parts in right position. Otherwise engine

cannot perform.

1. All marks of the following parts should be towards combined surface of left crankcase and

transmission case:Output shaft of left crankcase, middle shaft, output shaft bering

6203,6202,6204, and output shaft of transmission case, middle shaft, output shaft bearing

6004,6002,6301.

2. The side of driven wheel disc rolling needle bearing with mark needs to be toward seeable direction,

and the side of ball bearing with mark needs to be towards clip.

3. The convex prick side of the gasket between driver wheel disc and driven wheel disc is towards

locknut.

4. The side of kick-starter gear and transition gear with mark is towards left cover.

5. Chain guiding groove is towards chain, and column rod of chain guiding part is not higher than

the surface of cylinder.

6. White piston circle is the first one, black piston circle is the second one; hatches

of circle 1 and circle 3 are towards exhaust port, hatches of circle 2 and circle

4 are towards inlet port; the side with English letter is towards the top of piston.

7. “IN” mark on piston is towards carburetor side.

8. Valve spring (dense end) is towards valve pipe.

9. The side of camshaft bearing 6002 with mark is towards cam.

10. The side of oil pump with letters is towards outside.

The side of left and right crankcase bush with “W” mark is towards the reverse of combined surface

of left and right crankcase

20

d . E N G I E N R E M O VA L A N D I N S TA L L AT I O N

REMOVAL INSTALLATION

Guiding-wind cover/fan cover/carburetor left crankcase assy./gearbox assy.

Left crankcase cover/gasket/piston pin gearbox

Outside part of left crankcase crankshaft/left and right crank motor

Chain adjustor /cylinder head cover oil pump/super-clutch/electric start transition gear

Camshaft holder/cam right crankcase cover/oil filter/oil gauge

Cylinder cover/gasket/pin coil/flywheel/fan impeller

Cylinder/gasket/pin piston/piston pin/spring clip

Spring clip/piston pin/piston cylinder/gasket/pin

fan impeller/flywheel/coil cylinder cover/gasket/pin

Right crankcase cover/oil filter/oil gauge cam/camshaft supporter

Right crankcase outside chain adjustor/cylinder head cover

Start motor/left and right crankcase/crank left crankcase outside assy.

Gearbox left crankcase cover/gasket/pin

Left crankcase/gearbox cover guiding-wind cover/fan cover/carburetor

NOTICE:

a) Before installation, wash engine parts, and then lubricate engine, refer to recommended torque volume to lock

screw.

b) Pay special attention to single direction fixing accessories.

Start and inspect oil road lubricating system after having reinstalled engine.

21

C O W L I N G A S S E MB LY

REMOVAL:

Scrrew (10) screw (6)

Bolt (1) bolt (7)

Top cowling (11) fan whorl cover assy. (8)

Bottom cowling (4) pastern cover (9)

Top cowling seal gasket (2) cooling pipe (5)

Bottom cowling seal gasket (3)

Coil clip (12)

Pastern cover (13)

Whorl cover screw(6) 2N.M

Whorl cover bolt (7) 11N.M

Cowling screw (10) 2N.M

Cowling bolt(1) 11N.M

installation：：：：The installation sequence is essentially the reverse of removal.

Notice: avoid missing cowling seal bar.

22

B . c y l i n d e r h e a d i n s t a l l a t io n

REMOVAL

Cylinder head cover (1)/cylinder head cover seal bar

Right against “T” mark on magneto

（in the bottom of exhaust stroke ）

timing chain tensioner（2）

atmolysis shaft assy.（3）/atmolysis shaft chain

（4）

（shuf off）

Atmolysis shaft holder assy./Atmolysis shaft fixer assy.

Cylinder head assy.

valve lock clip/valve spring holder（5）/inlet、exhaust

valve spring）

（special tool T04）

inlet valve and exhaust valve（7）

Valve oil seal assy.（8）

Valve pipe（9）

Cylinder head（10）

Installation

Cylinder head

Valve pipe/valve oil seal assy./gasket

Inlet valve and exhaust valve/valve

spring/spring holder/lock clip

Cylinder head assy.

Atmolysis shaft chain/atmolysis shaft

assy.

（mesh）

Atmolysis shaft assy. and atmolysis shaft

fixer assy.

Right against mark “T” on magneto and
correct timing mark on timing gears
(keep timing scale of timing gears on the
same level with joint surface of cylinder
head cover)

Timing chain tensioner（adjust）

Adjust valve clearance

（inlet valve clearance: 0.03~0.05mm,

exhaust valve clearance: 0.05~0.06mm）

Cylinder head cover and seal rubber bar

*Remove it if necessary

TORQUE：：：：

1. Cylinder head cover fixing bolt 10~12N·M

2. Tension bolt and fixing bolt 10~12 N·M

3. Cam fixer locknut 22~25 N·M

4. Inlet pipe locknut 10~12 N·M

NOTICE：：：：

1.Skive valve before installing vavle, and shake it, valve and valve seat should be even after
skiving.

2. Daub valve lever with some cream to avoid scratch it, after having installing it, valve lever

should be turned flexibly without block.

3. Be sure to keep dense end of valve spring down

23

c . AT M O LY S I S S H A F T F I X E R A SS E M B LY

REMOVAL

Atmolysis shaft fixer assy. and atmolysis shaft
assy.

Atmolysis shaft fixer assy.

Rocker arm shaft（2）

Gasket（3）and rocker arm（4）

Stopper board（5）

Axes （6）and bush（7）

Mass （8）and spring（9）

Atmolysis shaft fixer（10）

Atmolysis shaft assy.

Atmolysis shaft sprocket comp.（11）

Atmolysis shaft right bearing（12）and atmolysis

shaft left bearing（13）

Auto reductor outside ring（14）and ball bearing,

spring（15）

Adusting gasket（16）and atmolysis shaft（17）

INSTALLATION

Atmolysis shaft and right bearing（12）

Adjusting gasket（16）

Auto reductor outside ring（14）and ball bearing,

spring（15）

Atmolysis shaft left bearing（13）

Atmolysis shaft sprocket assy.（11）

Atmolysis shaft assy.

Atmolysis shaft fixer（10）

Axes（6）, bush（7）,mass（8）and spring（9）

Stopper board（5）

Rocker arm（4）and gasket（3）

Rocker arm shaft（2）

Atmolysis shaft fixer assy.

Atmolysis shaft fixer and atmolysis shaft assy.

NOTICE：：：：

When installing rocker shaft, remember to daub rocker with lubrication, and keep groove of center rocker shaft on

the same level as the hole of rocker seat.

24

25

d . P I S T O N I NS TA L L AT I O N

REMOVAL:

The first ring

The second ring

Oil ring slice（一）

Oil ring slice（二）

Oil ring bush

Piston

Installation：：：：

The installation sequence is essentially the
reverse of removal.

Notice：：：：

1、 The first ring is white ring, and the second ring is black one.

2、 The sides of the first ring and the second one with English Letters are up.

3、 Never make mistake in positioning the first ring and the second ring

4、 Letter “IN” is towards inlet port, and the first ring is dead against oil ring slice (一).

5、 The gap of spring clip is 80º-100º against the gap of groove.

ITEMS VOLUME

The first ring 0.1~0.2mm

The second ring 0.1~0.2mm

Hatch clearance during working

Oil ring slice 0.3~0.4mm

The first ring 0.013~0.045mm

Clearance between piston ring

and groove

The second ring 0.013~0.045mm

26

e . L E F T C R A N K C A S E C O V E R I N S TA L L AT I O N

Removal

Left crankcase cover assy.

Clip (1) fender (2)

Left crankcase cover (3)

pin（4）/gasket（5）

The installation sequence is essentially the reverse of removal.

Notice：：：：

1、 When installing left crankcase cover, tap it to its proper postion with wood hammer or rubber hammer not metal

hammer to avoid damaging the cover.

2、 Position clip (1) and fender (2).
3、 Lock bolts diagonally and for all bolts torque is 10-12N.M.