Yamaha GP 338F, GPK433F Servise Manual

VA

AHA

'

..

..

, .

,

..

8101108111

GP

338F

/

GPK433F

.

SIRVICIMAIUAI

~

TABLE

OF

CONTENTS

CHAPTER

1

-1

.
1-2. Service Data
1-3.

CHAPTER

2-1 .
2-2.

2-2-1.

2-3.

2-3-1.
2-3-2.
2-3-3

2-4

. C.D.I.

2-4-1.

2-5.

2-5-1.
2-5-2.
2-5-3.
2-5-4.
2-5-5.
2-5-6.
2-5-7.
2-5-8.
2-5-9.
2-

5-10.
2-5-11.
2-5-12.

2-6. Oil Pump
2-7

. Engine .....

2-7-1.

1.

GENERAL

Specifications ..............

Tools .........

2.

ENGINE

Removing the

Starter .....

Removal

Primary Sheave

Disassembly.

Cleaning and Inspection ............... ........

. Assembly

Magneto

Removal ...... ........

Carburetor .... ....... ...............

Removal.
Disassembly (GPX338F)

Cleaning and Inspection (GPX338F) ................................................

Assembly
Installation (GPX338F)
Adjustments

Disassembly (GPX433F) ....

Cleaning and Inspection (GPX433F) ................. ..............

Assembly (GPX433F) .... ........ . ...... .

Installation (GPX433F)
Adjustments
Carburetor

Disassembly ...........

.......

.. .....

Engine.

..........

......... .

..................

........

(GPX338F)

(GPX338F) .

(GPX433F).

with

Accelerator Pump (GPX433F)

....

.............

............. .

............................................

...

.............. .

.. ..

.

..............

....

.................

....

......

.

.................................................

.. ...........

..

.. .....

.......

...

...........

...

......... ............

.. ............................

............................................................ ...

............ ... ............................... .....

.. .. ..

.....................

..

............. 8

...........

..............

.. .........

..

11
12
14
15
16

..

17
18
18
18
20

..

...

20

21

..... 21

..

21

.
...

23
24

....... 26

26

5

5

6

7

7

9

9

CHAPTER

3-1.

3-2.

3-3. Chain Housing ........... ..........

3.

POWER

Secondary Sheave .................

3-1-1.
3-1-2.
3-1-3.
3-1-4.

3-2-1.
3-2-2.
3-2-3.
3-2-4.

3-3-1 .
3-3-2.
3-3-3.

Removal
Cleaning and
Assembly
Adjustments

Disc Brake ............... .

Removal
Cleaning and Inspection
Installation
Adjustments

Removal
Cleaning
Assembly

..

....

and Inspection

..

TRAIN

Inspection.

......

...... .

...

29

....

.....

...29

.... ...

.......

...36

. ...

....

...

....

.

...

.

30
30
30
33

35

36

36
37

38

39

39

..

40

.....

.

.. ..............

............

. ...........

. ....

....

..

.............

...

.........................

...............

..." ...................

Front Axle

3-4 .

Rear Axl

3-5

.

Sliding Suspension ..................

3-6.

e.

......................

....

...............

..... .

....

.. ..

........... ......................... .............. .... 43

.........................

...........................

..................

.....

.............

.......

. 41

42

CHAPTER

4-1 . Frame ..... ........

4-2. Engine M ount .....

4.

STEERING

4-3. Oil and Fuel...... . .

4-4.

4-5.

4-6.
4-7. Shroud

CHAPTER

CHAPTER

Ski .

Steering . ............ .

Control Wires

5.

6.

..

........... . ..... .

..

.....

ELECTRICAL

TIGHTENING

(SKI)

.. ...... ..

.....

.....

. ...... ..

...

..........................................

AND

.................

..

... ... .

..

.. ......

SYSTEM

TORQUE ....

CHASSIS ......................

........

......

...................... .............

.. ..

...

....

..

.

. ........... .

.. .

.....................

..

................................. ...........

.

. .....................................................

.......................................................

. .......... ......

..................................

..........

...............

.............................

............. ...............

.. ............

...

........

.. .. ..

..........

.... 48

......

. ....

. ..

....... 57

45

46

..

48

..

48
48
48
48

49

GENERAL

-Specifications, Service Data

1

-1

. Specifications

Model

Dimensions &

Overall length (including the ski)
Overall
Overall height (including the windshield)

Engine:

Type

No.

of
Displacement
Bore & stroke

Cooling system

Lubrication system

Oil

tank
Starting System:
Fuel System:

Fuel
Fuel

tank

Carburetor

Weight:

width

cylinders & arrangement

capacity

capacity

CHAPTER

98.8

ins.

39

.8 ins.

38.0

ins.

Two-stroke

aluminum
Parallel

20.62

cu.in.

2.362 x 2.346
Natural air cooled
"Autolube"

2.4

qts.

(2.25

Recoiled hand starter

Gasoline (high-octane)

6.0

US.gal.
Diaphragm type
MIKUNI

1.

GENERAL

GPX338F

(2,510

mm.)

(1,010

mm.)

(965

mm.)

five-port

cylinder

twin

(338

c.c.)

ins.

oil injection

lits.)

(23.0

lits.) 6.0 US.gal.

BN38-34SH

induction

(60 x 59.6

x 2

mm.)

GPX433F

98.8

ins.

(2,510

mm.)

39.8

ins. (1,

010

mm.)

38.0

ins.

(965

mm.)

Two-stroke
aluminum
Parallel

26.42

2.677 x 2.346
Natural air cooled
"Autolube

2.4

qts.

Recoiled hand starter

Gasoline (high-octane)

Diaphragm type
KEIHIN

five-port

cylinder

twin

cu.in.

(433

" oil injection

(2.25

lits.)

(23.0

CDX42-38

ins.

c.c.)

(68 x 59

lits.)

x 2

induction

.6 mm.)

Ignition and Electrical Systems:

Ignition
Headlight

Taillight

Stoplight

Meter
Frame:
Drive track:

Transmission:

Brake:

1

-2.

Engine:

Cylinder head

Piston clearance

Lubrication

system

lamp

Service

Data

Model

tightening

oil

torque

Flywheel
12V. 60/
12V.8W.
12V.23W.
12V.3W.

Fabricated
Molded

with
V-belt

Disc brake

Nuts:

Bolts

:

0.0018 -0.0020

(0045 -0.050

Yamalube

magneto

60W.

rubber, steel reinforced

cleats

automatic

GPX338F GPX433F

16

.6 -

(2.3 -

14.5 -16.6 ft-Ibs. Bolts:
(2.0 -2.3

or

Johnson

(CD

(High/

aluminum

transmission

19

.5 ft-Ibs.

2.7

m-kgs.)

m-kgs.)

in.

mm.)

outboard

I)

Low

beams)

and steel

oil

Flywheel
12V.
12V.8W.
12V.23W.
12V.3W.

Fabricated
Molded

with

V-belt
Disc brake

Nuts: 16.6 -19.5

0.0018 -0.0020

(0.045 -0.050
Yamalube

magneto

60/60W.

cleats

automatic

(2.3 ­14
(2.0 -2.3

(High/Low

aluminum

rubber, steel reinforced

transmission

2.7

.5 -

16

in.

mm.)

or

Johnson

(CDI)

and steel

ft-Ibs

m-kgs.)

.6 ft-Ibs.

m-kgs.)

outboard

beams)

.

oil

Ignition

timing

B.T.D.C.

1.6±0.1

-1-

mm.

BTD.C

. 1.

6±0.1

mm.

GENERAL

-Service Data, Tools

Compression ratio
Idling speed
Spark plug

Carburetor:

Model
Number

Main
Slow

P.J.

S.J.

Fuel level

seat

Valve
Ski

width

Drive

track

Oil

pump
Minimum
Maximum

Note:

#95

pilot
acceleration is
0° C

at

Model

of

turns
adjuster
adjuster

deflection

jet

low

altitudes.

out

stroke

stroke

should

not

be

used

smooth

7.8 : 1

2,100

N.G.K. B-9EV

MIKUNI

L.

L.

#8

0.059

29.5

0.69

0.20 -0.25

1.60 -1.78

when

the engine speed

at

temperatures

GPX338F

r.p.m.

BN38-34SH

R:

1 ±'

1/8

R:

3/4

5 (Spare

#95)

in. dia.

ins.

(750

- 0.71 in. (17.

below

(15

mm.)

mm.
mm.

x 2

mm¢)

5±5

(87800)

mm.)

GPX433F

7.0:

1

2,500

r.p.m.

Champion N-2G

KEIHIN

L.

L,

R:

R:

CDX42-38

1 ± 1 18

1-3

/8

#65
#45

0.059

in. dia. (1.5 mm¢ )

29.5

ins.

(750

mm.)

0.69

- 0.71 in.

0.20 -0.25 mm.

1.60 -1.78 mm.

x 2

(17.5±5

(87900)

mm.)

1-3 _

To service the

Tools

snowmobile

quired.

o Special

tools

o Gauges (Measuring

1.

Special Tools

2-b.

, the

instruments

following

)

tools

are re-

o General

tools

o Standard tools

1-f.

1-a. Crankshaft
1-b

. Crankshaft jig
1 -c. Press box
1-d.

Press

pin

separator

Wedge

1-g. Stop

Magnet

2-a.
2-b. Magnet

(56 mm.)

puller
puller

body
screw

2-

c.

2-d

3.

4.

Fig. 1-1

- 2 -

Magnet

.

Dial gauge stand
Sock

puller

Screw, 8-mm.

et

end

wrench

attachment

L :

80 mm.

#2

Sheave

5.

Primary

6.

Primary sheave

7-a.

Primary

7-b.

gauge

fixed sheave

sheave

puller

bolt
installer/remo
installer/remover

ver 2

1

2. Gauges

~

6

...

.

~-

2 3

.~

4

·

~

13

GENERAL

-Tools

3. General Tools

1. Feeler gauge

2. Dial gauge

3.

Micrometer

4. Cyl i

nder
Vernier
Torque
Point

gauge

calipers

wrench

checker

5.

6.

7.

Fig.

'-2

8. Coil

Electro

9.

10. Scale

11. Spring
12

. Pocket

13

Tachometer

tester

tester

balance

tester

18

Plug

1.
2

·3

4.

5.

6.

7.

8.

9.

10.

wrench

Set

of

open-end

Set

of

socket

Soft

-faced
Steel
Circlip pliers (ST type)
Circlip
Needle-nose pliers
Pliers
Ph

hammer

hammer

pliers (RT type) 17.

illips-head scr

wrenches

wrenches

ewd

river (small)

Fig.

- 3 -

1-3

Phillips-head

11

.

Phillips-head

12.
Slotted-head

13.
Slotted-head

14

.

Slotted-head

15.

T-handle.

16.
L-handle socket

18.

Torque

19. Scraper

Allen

20.

screwdriver
screwdriver
screwdriver
screwdriver
screwdriver

socket

wrench

wrench

wrench and sockets

wrench

(6 mm.)

(large)
(medium)
(medium)
(large)
(small )

GENERAL

-Tools

4. Standard Tools

6

11

2

13

8

9

10

1.

Plier

2.

30 x 22

3.

17x14mm.

4.

17 x 13

5.

12x10mm.

6.

10

x 8 mm. open-end

7.

13 mm. special

mm.

mm.

special
open-end
open-end
open-end

wrench

wrench

wrench
wrench
wrench

wrench

Fig.

1-4

8.

S

10

11.

12.

13.

14.

Point

w rench and feel

13

x 21 mm. plug
Screwdriver
Combination
Phillips-head
Allen

wrench

Tool bag

wrench

handle

slotted

screw

er

gauge

and Phillips-head

driver

screwdriver

-

4-

ENGINE· Removing

the

Engine

2-1.

This

from

The engine can be

buretor

The

frame

Too

1.

2. Remove

3. Remove the

Removing

chapter

the

carburetor

ls Required:

Pliers
Slotted
10
Chisel
Steel
Long nose pliers

17

Remove
springs
then
Next.
handle

from

and

frame.

. and

without

mm.

head

mm

. socket-end

remove

remove

holder

the

remove

deals

starter

and

removing

head

screwdriver

socket-end

hammer

the

from

the

the

.

the

throttle

carburetor

two

silencer 1. (Fig.

the

with

the

removed

assembly.

starter

wrench

wrench

four

spring

exhaust

two

the

starter

assembly.

spring

Engine

procedure

without

can

the

engine.

(M)

chamber. using pliers. and

exhaust

wires

assemblies

be

hooks

chambers.

handle

(R & L)

2-1)

for

engine

removing

removed

and

from

and choke

from

CHAPTER

removal

the car-

from

the

four

tension

the

starter

wires

the silencer.

2.

ENGINE

Fig. 2 2

Fig . 2-1

4. Remove the six
10-mm

. open-end
plate. Next.
oil

pump

remove

. (Fig. 2-2.

bolts

wrench.

from

the

2-3)

the

carburetor

and

remove

tachometer

using the

the silencer -

cable

from

the

Fig. 2-3

5.

Disconnect
neto. Remove
and

demount

Note:

Before
mary
procedure.
carburetor

the

the

demounting

sheave

must

refer

removal. refer

lead

the

engine.

to

wire

four

or

mounting

be

removed

20-3.

coming

nuts

to

from

securing the engine.

the

engine. the

or

installed.

Primary

2-5.

the CDI

Sheave.

mag-

pri­For
For

-

5-

ENGINE

2 -

2.

Tools

required:
10-mm
13-mm. socket

Slotted

-Starter

Starter

. socket

-head

wrench
wrench

screwdriver

19

~

/

~~

(medium)

20

~

13

3

2

11

I

1.

2.

3.

4.

5.

6.
7

8.

9.

10.

Starter

case

Sheave

drum

Starter

spring
Drive pawl
Thrust washer

plate

Drive

Return spring
Return
Drive plate

Thrust

spring

spring

washer

Fig. 2-4

-

6-

11

Spr

12

Nut

Rope

13

.

14.

Handle

15.

Con

16.

Starter

17

Bo lt

18

.

Spring

19

. Bo lt

20. Spri

ing

washer

(Q

nector

was

ng

washer

=

1820)

pulley

her

For disassembly. assembly. inspection. cleaning and ad­justment. refer to the

GPX338F/GPX433F

Service

Man-

ual.

ENGINE

-Primary Sheave

2-2-1.

Removal

Remove the four bolts holding the starter and remove it

from the crankcase cover. (Fig .

2-3.

Primary

Sheave

2-5)

Fig

. 2-5

1.

Primary

2.

3.

4.
5

fixed sheave
Bushing
Spring

seat
Compression
Primary

sliding

spring

sheave

complete

complete

Fig. 2-6

- 7 -

6. Cam

7.

Primary

8. Lock

9.

Bolt

10.

V-Belt

sheave cap

was

her

complete

ENGINE

Tools

required:
Chisel
Steel
Primary
Primary
Pri

mary

22

mm.

17

mm.

2-

3-1.

(1)

Straighten
bolt

er

. (Fig.

-

Primary

hammer

Disassembly

lock

Sheave

fixed sheave
sheave
sheave

socket
socket

the
washer
2-7)

puller

bolt
installer/remover
installer/remover

wrench
wrench

primary

, using

sheave assembly

the

chisel

(Special tool)

1 (Special tool)

2 (Special tool)

mounting

and

steel

hamm

­Fig. 2-9

(4)

With
stalled,
mary

primary

fixed sheave

remove

sheave

the

from

installer/remover

primary

sliding sheave and pri-

the

crankshaft. (Fig. 2

1 being in-

-10)

Fig. 2-7

(2)

Install

primary

edges

of
sheave
forced by

Fig. 2-8

(3) Using

ry sheave assembly
primary

so

the

the

sheave cap. (Fig.

sheave

primary

that

22-mm

sliding sheave and

the

primary

spring. (Fig. 2-8)

. socket

securing

holder

1 (special tool) on

sliding

wrench,

bolt

2-9)

primary

sheave

remove

and

is

the

prima-

remove

the

fixed

not

the

--------

Fig.

2-10

(5) Remove the

Fig. 2-11

drive

belt. (Fig. 2-11)

- 8 -

2-3-2.

(1)

(2)

Cleaning and Inspection

Cleaning

Thoroughly
them

with

compressed

clean all

Inspection

1) Check

the

primary

excessively, replace.

2)

Check

the

tapered
ry fixed sheave
replace.

3)

Check

the

primary

If

excessively fatigued, replace.

4)

Check

the

primary
movement.
Grease
parts

Also

the

.

grease

contact

the

parts

in a

detergent

air.

shaft splines for wear.

ends

of

the

crankshaft

for

scratches.

spring

sheave cap

area .

weight

pivot

for

of

If

fatigue.

weights

the

weights

points.

oil. and

and

If

worn

prima-

dry

scratched unduly,

for

smooth

with

other

5)

If

the

sliding sheave spline is excessively

place.

6)

Check

the

7)

If

the

V-belt
cracked.
It

is advisable

used

for

2-3-3

. Assembly

(1) Place the

(2)

Install

the
compression
assembly on

Place

the
and

primary

sheave

it

width

should

to

for

bends.

is

worn

be replaced.

replace

a race.

V-belt

around

primary

V-belt

fixed sheave, bushing,

spring,

the

primary

crankshaft.

between

sliding sheave. (Fig.

ENGINE

-

Primarly

worn,

If

bent, replace.

to

26

the

mm. or

V-belt

if

the

less,

machine

the secondary sheave.

spring

sliding sheave as an

the

primary

fixed sheave

2-12)

Sheave

re-

or

seat.

if

is

1.

Primary
Bushing
Spring

fixed sheave

seat

2.

3.

complete

Fig.212

- 9 -

4.

Compression

5.

Primary

6.

V-belt

sliding

spring

sheave

complete

ENGINE·

Primarly

Sheave

Note:

Apply

Shell Alvania grease
fixed sheave .
Clean

the

tapered

primary

(3)

Push
sheave
sheave assembly securing bolt. and install
sheave
sheave and pri

Fig.213

fixed sheave.

in

the

installer/remover

installer/remover

portions

primary

mary

sliding sheave. (Fig.

#2

or

of

the

sliding

sheave

2 (special tool) and

1

on

the

#3

to

crankshaft

using

primary

the

primary

2·13)

primary

and

primary
primary

fixed

Tightening

Note:

When
weights

Fig. 2-15

torque:

installing the

in

the

position

primary

as

illustrated

sheave cap, keep the

. (Fig.

2-15)

(4)

With

primary
stalled, remove
assembly securing bolt. Then
sheave cap
ing bolt.
Next,

remove

and bend the

Fig. 2-14

with

lock

sheave

primary

the

primary

washer

primary

installer/remover

sheave 2 and

sheave assembly secur-

sheave

. (Fig.

primary

tighten

installer/remover

2-14

)

1 being in-

sheave

the

primary

1,

-

10-

ENGINE·

C.D.I.

Magneto

2-4. C.D

.I.

Tools required:

10 mm. T-handle

26

mm. socket

Iron bar

(12

13 mm. T-handle

Magneto

wrench

wrench

mm

..

length

wrench

25

mm.)

(Fig.

19

mm. open-end

Flywheel

Impact

Steel

screwdriver

head

2-16)

magnet

hammer

wrench

puller (Special tool)

(Phillips large)

1.

Charg ing coil
Lighting
Lighting
Spacer

head
Spring
Pulser

coil 1
coil 2

screw

washer

2.

3.
4

5. Pan

6.

7.

8.

9.

10.

11.

12.

13.

14.

Panhead
Spr

ing

washer

Pla

in

washer

Lead

wire

clamp

Lead

Lead

clamp

Panhead

Fig. 2-16

-

11

-

screw

assembly

screw

15.

Spr

ing

washer

Rotor

16

.

17. Pan head scr
18

19.

20.

21.

assembly

Hole cover
Crank

shaft

Spring

washer

Washer

ew

nut

ENGINE·

C.D.I. Magneto

2·4·1.

(1)

Loosen
cover. (Fig.

Fig. 2·17

(2)

With
able
step in
curing
(In
"bar"
The

Removal

the

four

bolts

and

remove

2-17)

the starter assembly removed you

to

remove

this

nut

this

case.

should be inserted

flywheel

the

procedure is

with

a socket

to

loosen

can

be

magneto

locked.) (Fig.

assembly.

to

remove

wrench

or
into

1.02

tighten

the hole in the pulley.

the

the

ins.

the

2-18)

crankcase

will

now

be

The

first

flywheel se-

(26

mm.).

flywheel.

(4) The flywheel

Fig. 2-20

(5)

a

magneto
requires the use
our

special
screws
flywheel.
(Note:
take the
the flywheel so

All

parts

magneto backing plate. have been removed. The
only

be removed is in the case
down.
der

removing the three

an

impact

tool

that

come

Immediately

woodruff

that

of

the

time

that

the

The backing plate has

to

split the cases and

screwdriver. (Fig.

can

now

be removed. This

of

special puller

kit. Be sure

with

the puller

after the flywheel is removed.

key

off

it

is

not

magneto assembly. except for the

magneto

of

four

that

you

will

to

use the three short

when

removing

the shaft and attach

lost.) (Fig.

backing plate needs

of

complete engine tear-

to

this

hold-down

2-26)

2-20)

be removed in or-

is accomplished by

screws.

find in

it

the

with

to

to

Fig. 2-18

that

(3) Remove the bolts

these

bolts

are

aside. (Fig.

Fig. 2-19

2-19)

hold the starter pulley. Once

removed. the

pulley

can

be

set

-12

Fig. 2-21

-

ENGINE

-C.D.I. Magneto

(6) Loosen the

reverse side
pulser holding

three

of

screws

ground

the

wire

holding

coil plate. and loosen

(two

each per pulser) and four

screws

the

on

the

four

pulser coil holding
Then remove

the

screws

(two

pulser coils

each per pulser coil).

from

the

coil plate.

1.

2.

3.

4. Spacer

5.

6.

7

8.

Charging coil

Lighting

coil 1

Lighting coil 2

Pan head
SJ;lring
Pulser

Pan head

screw

washer

screw

Fig. 2-22

- 1

3-

9.

Spring

10. Plain

11.

Lead

12. Lead

13. Lead
Pan head

14.

15. Spring
Pan head

16.

washer

washer

wire

clamp
clamp

washer

assembly

screw

screw

ENGINE

·

Carburetor

2-5.

As

should

Carburetor

long

as

not

the

be disassembled unnecessarily.
be cleaned once
ing

to

operating

Service

Tools:

Phillips-head

engine

during

runs

the season or

conditions.

screwdriver

smoothly,

(medium)

49

13

15

16

14
17

18
19

the

carburetor

But

periodically

it

should

accord-

i---

Long nose pliers

13-mm.
10-mm.

6-mm.

Air

Slotted-head
Pliers
Steel head

50

t(

48

/

/

f30

~ ~29

---~:

r"

11

21
22
23

open-end
open-end

open-end

compressor

screwdriver

hammer

wrench
wrench

wrench

GPX338F

(socket

wrench)

(medium)

1.

Gasket
Check seat valve

2.

Set

check plate

3.

Valve seat

4.

Valve seat ass'y

5.

6.

Plate
Spring

7.

Pan heed

8.

Diaphragm

9.

Diaphragm

10.

Lever pin

11.

Oval head

12.

13.

Main

diaphragm

Body

14.
15
16

17.

18.

19.

20.

21. Gasket

22.

23.

24.

25. Pan head
26

27. Cable

28. Plunger spring

29. Plunger cap

30. Cap
31
32

33.

34.

35.

36.

37.
38

39.

40.

41.

42.

43.

44.

45.

46.
47

48.

49.

50. Clip

51.
52

53. Plate

54.

gasket 1

Body

1

Pump
Body

2

Body

gasket 2

Check valve
Body

3

Cover
Screw
Spring

starter

Washer

Spring

Washer

Main

adjusting

Slow

adjusting

Slow

adj
a-Ring
Pilot

jet

Washer

Lock

nut

Scr

ew
Spring
Throttle
Nut

Throttle

Bracket
Screw
Shaft
Washer

Lever

Washer

Rod

screw

washer

washer

screw

arm
spring

screw

diaphragm

washer

screw

plunger

assembly

usting

(#

85)

screw

adjuster

complete

(#

1 ,5)

screw

spring
screw

Fig, 2-23

-14-

1. Gasket
Pump

2

3

4. Gasket

5.

6.

7. Needle va lve

8. Valve pin

9.

10

.

11. Arm
12

.

13.
14

15. Screw
16

. Bli nd cap

17

. Plug scr

18. Was
19

. Diaphragm

20.

21. Spr

22.
23

. Lock n

24

.

25

.

26.
27

.

28

. Rod

29

. Cap

30. Pump
31 Diap hr agm

32. Comp
33

. Fuel cover

34

.

35.

36.

37.

38.

39.

40.

41.

42.
43

. Coll ar
44 Clip
45

. a -ring

46. Washer
47

diap hr ag m

P

ump body

va

Check

mp

body

Pu

Arm

spr

ing

Fl

oat

arm

pin
Oval head
Washer
Fuel leve l pipe

ew

her

Compression spring

ing seat

Pump

body

ut

Stop

screw
U-ring
Pan head
Pan head sc

body

ress ion spring

Pan head scre w
Spring

washer

Collar

Arm

Lever pin

Washer

Cotter

pin
Rod
Spring

Main

adjuster

lve

screw

screw

1

2

3

rew

4

spring

ENGINE

48

49. Spr
50
51

52. Main adju ste r sc

53.
54
55

56.
57

58.
59

60. stow jet
61

62
63
64

65. Spr

66. Link
67

68. Collar

69.

70.
71

Ma

in adjuster

.

ing

Ad

jus t scr

.

Gear

.

Stay

plate

. Li

nk

shaft

Co li ar

.

Spr

ing pin

Compression

Pan head

Spr

ing

.

. Partial
. Gasket
. Plate

Pan head

.

ing

lever

. Coli ar

Washe

Pan head

ll

ar

Co

.

·

Carburetor

ew

screw

washer

1#52)

jet

1#68)

screw

washer

r

screw

n . Rod

Link lever

73

.

74.

Connector

75

Lock

76

77.
78

79.

80.

81

82.

83.

84. Spr

85

86

87

88. Stay

89. 80lt

90.

91.

92. Nut

93.

washer

Nut

Pan head
Washer
Nut
Stop
Stop
Stay

Pan head

Stay

Pan head
Sp ring

Spr
Cable adjuste r

Pan head

screw

screw spri
screw

plate

screw

ing

washer

plate

screw

washer

plate

ing washe r

screw

screw

rew

spring

ng

2-5-1.

(1) Remove

Removal

the

throttle
fuel pipe and oil
f

our

nuts

using

remove

Be careful

buretor

the

carburetor

not

flange and

wire

. choke wire. pulse pipe,

pump

control

the 13-mm.

from

to

lose the spacer

the

stud bold. (Fig. 2-2

open-end

the

rod, and

w rench. Then

cylinder.

between

remo

5)

Fig. 2-24

ve the

I )

the car-

Fig. 2-25

- 15 -

ENGINE

-

Carburetor

(2) Remove

2 as an assembly

26)

Fig. 2-26

(3)

Straighten
bolts

using

the silencer plate

the

two

springs. and

the

lock

the 10-

from

from

washers,

mm.

the

remove

the

silencer plate . (Fig. 2-

T -handle

carburetor

silencers 1 and

and

remove

wrench

. (Fig. 2-

. Remove

the

27)

six

2-5-2.

Disassembly

(1) Loosen the

(rubber). Loosen

3,

check

valve,

ket,

body

screw,

1 and

3

2

4-----<.

2--~

5

6

7

(GPX338F)

and

the

four

body

2 gasket,

main

diaphragm.

remove

screws, and

the

body

(Fig. 2-

cover

2,

and

remove

body

28)

gasket

body

1 gas-

Fig. 2-27

Before disassembling

be

washed

compressed

with

air,

the

gasoline

take

care
holes such as the fuel inlet
erwise,

the

compressed

air can break

carburetor,

or

petroleum.

not

to

port

and

its

blow

impulse
the

exterior

When

into

any

port.

diaphragm

should

using
small

Oth-

.

1.

Main

2.

3.

4

5.

diaphragm
Body gasket 1
Body

1

diaphragm

Pump

Body

2

Fig. 2-28

(2) Loosen

pin,

the

diaphragm
valve.
Remove the
plate and valve seat
Remove the
set check
Since the
not

to

lose

9

10

i-~11

very

2-29)

10.

11.

12.

13.

spring

thin,

Cover
Screw

Spring

Pan head

and needle

remove

remove

be careful

6

Body

7.

8.

9.

gasket 2
Check valve
Body

3
Gasket

oval head screw, and remove

arm,

diaphragm

two

pan head screws, and

(#

1.5).

two

oval head screws, and

plate, check valve seat and gasket.

check

valve seat is

or

damage. (Fig.

washer

the

screw

lever

the

the

-16-