Subaru Robin Power Products HD7830, HD7832 User Manual

ROBIN

ENGINE

ROBIN

TO

MODEL

AMERICA,

W1SCONSJ.N

CROSS

REFERENCE

INC.

ROBIN

LIST

ROBIN

EY08

EY15

EY

15V

EY20

EY20V EY23

EY28

EY35

EY40

EY45V

EY2

I

EY44 EY 18-3 EY25

EY27

-

v

WISCONSIN

W1-080

W1-145 W1-145V

Wl-185

W1-185V

W 1-230

w

1-280

W1-340

W

1-390

W

1

-450V

EY21W

EY44W

EY18-3W EY25W

EY27W

ROBIN

EHl1

EH12

EHl5

EH17

EH2

1

EH25 EH30 EH30V EH34 EH34V

EH43V

EC13V

DY23

DY27

DY30 DY35 DY4 1

TWO

DIESEL

CYCLE

WO1-115 wo1-120 WO1-150

WOI-170

wo1-210

WO

1-250

WO1-300

WOI-3oov WO1-340

WO

1

-3

40V

WO

1

-430V

WT1-125V

WRD WRD

WRD1-300 WRDI-350

WRD1-410

1-230

1-270

CONTENTS

Section Title Page

1

.SPECIFICATIONS.

2.PERFORMANCE

2-1

2-2

2-3

2-4

3.FEATURES

Maximum

Continuous Rated Output

~~~i~~~

performance

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

4.GENERAL DESCRIPTION OF ENGINE COMPONENTS

4-

1

Cylinder And Crankcase

4-2

4-3

4-4 4-5 4-6

4-7

4-8

4-9

4-

4- 1 1 4-

4-

Main Bearing Cover Crankshaft Connecting Piston Rings Camshaft Valve Arrangement Cylinder Head Governor System

10

Cooling Syst ern

Lubrication

12

Ignition

13

Carburetor

14

Air Cleaner

15

Balancers

16

Decompression System

17

Sectional View

5.DISASSEMBLY AND REASSEMBLY

5-

1

Preparations

5-2

5-3

5-4

5-5

6.MAGNETO

6-

6-2

6-3

7.

AUTOMATIC DECOMPRESSlON SYSTEM

Special Tools Disassembly Procedures Reassembly Procedures Break-in Operation

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

1

Flywheel Magneto Basic Theory

Wiring Diagram

8.CARBURETOR.

8-

1

Operation And Construction

8-2

Disassembly And Reassembly

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

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

Output

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

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

T~~~~~

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

curves

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

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

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

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

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

Rod

And

piston

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

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

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

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

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

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

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

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

System

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

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

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

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

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

Of

Engine

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

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

And

Suggestions

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

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

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

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

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

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

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

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

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

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

1

3

4

6

7

8 8

8

9

10

10 11

11

12

14

15

32

42

43

44

45

46

47

1.

SPECIFICATIONS

Model

Type Bore

X

Stroke

Piston Displacement

EH30

EH30B

Air-Cooled. 4-Cycle. Single-Cylinder, Horizontal

EH30BS

78

X

61

291

mm

cc (1

(3.07

7.76

EH30D

P.T.O.

X

2.40

cu.in.1

in.)

Shaft,

I

Gasoline

EH30DS

Engine

Compression Ratio

-~

Cont

i nuous

output

Max.

Max. Torque

of

Direction Cooling system

~ ~ ~~

Valve Arrangement

Lubricant Capacity

Carburetor

Fuel Fuel Consumption Ratio] Fuel Feed System Gravity Type

~ ~~ ~~ ~~

~~ ~~

Rotation

~~~~ ~ ~ ~

of

Lubricant

I

7.0/1800

9.0/1800

3-9/1250 kg m/rpm

Counterclockwise

Automobile Oil SAE

230

HP/rpm

As

Forced Air Cooling

Overhead Valve

1.2

liters

Horizontal Draft, Float

Automobile Gasoline

gr/HP-h At Continuous Rated Output

8.3

Viewd From P.T.O. Shaft Side

Splash Type Lubrication

#

(0.32

1.95/2500

20, # 30

U.S.

7.0/3600

9.0/3600

or

1

OW-30

gal.)

Type

HP/rpm HP/rpm

kg

m/rpm

Fuel Tank Capacity

Spark Plug Charging Capacity Starting

Speed Reduction Governor System Air Cleaner

Dry Weight

I

1

Dimensions

System

,

Length

Width Height

Recoil

I

3

1

.Okg

363mm

Starter

1/2

(

68.31

(

14.29in.)

Cam Shaft Drive

b.)

-1-

6

liters (1.58

Flywheel Magneto (Solid State) Ignition System

NGK

I

Electric Starter

BP6ES (CHAMPION

12V-1.3A

Recoil and

I

Recoil

U.S.

gal.)

N9Y)

-

Starter

I

Centrifugal Flyweight Type

Double Element Type

34.0kg ( 75.01

333mm

Specifications are subject

(1

3.1

1

395mm

482mm

b.)

in.)

30.0kg

363mm

(1

5.55

(1

8.98

(

in.)

66.1

I

b.)

(1

4.29in.)

to

change without nofice.

I

12V-

Recoil and

Electric Starter

-

33.0kg

333mm

1.3A

(

72.81

(1

3.1

b.)

1

in

Type

Model

EH348

Air-Cooled,

4-

Cycle,

EH34

EH34BS

Single- Cylinder, Horizontal

1

EH34D

~~~~~

P.T.O.

Shaft,

EH340S

Gasoline Engine

Bore X Stroke Piston Displacement

Compression Ratio

of

Rotation

of

Lubricant

Cont i nwus

Max.

output

Max. Torque

Direction Cooling system Valve Arrangement tu brication

Lubricant Capacity

Carburetor

Fuel

I

84

X

61

mm

338cc

8.0/1800

1

1.0/1800

4.82/1250 kg Counterclockwise As Viewd From

Automobile Oil SAE

HP/rpm

m/rpm

Forced Air

Overhead Valve

Splash Type

1.2

liters

Horizontal Draft, Float Type

Automobile Gasoline

(3.31

(20.63

8.3

#

20,

(0.32

X

2.40

cu.in.)

2.41/2500 P.T.O.

Cooling

#

30

U.S.

in.)

8.0/3600

1

1.0/3600

Shaft Side

or

~ ~~

gal.)

kg m/rpm

1

OW-30

~~ ~~

HP/rpm

.

Fuel Consumption Ratio Fuel Feed System Gravity Type

Fuel Tank Capacity

Ignition Spark Plug Charging Capacity

Starting System

Speed Reduction Governor System

Air Cleaner

Dry Weight

System

Height

I

Recoil

I

3

1

.Okg

363mm

-

Starter

1/2

(68.31

(1

230

Cam Shaft Drive

b.)

4.29in.)

gr/HP-h At Continuous Rated Output

6

liters

Flywheel Magneto (Solid State)

NGK

Electric Starter

BP6ES (CHAMPION

12V

-

Recoil

(1.58

1.3A

and

Recoil

I

Centrifugal Flyweight Type

Double Element

34.0kg

333mm

Specifications are subject

(

75.01

(1

3.1 1 in.)

395rnm 482mm

b.)

30.0kg

363mm

(1

5.55

(1

8.98

U.S.

gal.)

-

Starter

Type

(

66.1

(1

in.) in.)

to

N9Y)

I

b.)

4.29in.)

change

12V

Recoil and

Electric Starter

-

33.0kg

333mrn

without

-

(

72.81

(1

1.3A

3.1

b.)

1

in

nofice.

I

,

I

-2-

2.

PERFORMANCE

2-1

The maximum output is the output condition that all the moving parts are properly worn in after the initial break- in period.

A

-in.

2-2

The continuous rated output most favorable from the view point When the engine required

2-3

The maximum torque output at certain revolution.

MAXIMUM OUTPUT

new engine

may

not produce full maximum output while its moving parts are still not

CONTINUOUS

is

installed on a certain equipment,

from

MAXIMUM

the engine be kept below this continuous rated output.

TORQUE

of

an engine with its throttle valve fully opened under

RATED

is

the torque at the output shaft when the engine is producing maximum

OUTPUT

is

the output

of

an engine at optimum governed speed which

of

engine’s life and fuel consumption,

it

is

recommended that the continuous output

broken

the

is

-3-

2

-

4

PERFORMANCE

CURVES

OEHBOD,

B

9

8

7

Kg

-

m

6

5

4

3

2

1

0

2000

(1

000)

2400

(1

200)

2800

(1

400)

3200

(1

600)

3600

(1

800)

CONTINUOUS

RATED

OUTPUT

RECOMMENDABLE

\

HORSEPOWER

RANGE

REVLOUTION-

r.

p.

m.

-4-

*EH34D,

B

Kg

-

w

3

0

m

HP

A

52

B

w

cn

0

I

CONTINUOUS

RATED

RECOMMENDABLE

HORSEPOWER

OUTPUT

RANGE

2000

(1

000)

(1

REVLOUTION-

2400

200)

2800

(1

400)

3200

(1

600)

-5-

r.

p.

3600

(1

800)

m.

3.

FEATURES

1.

The overhead valve design offers a compactness, light weight and ideal combustion charastristics resulting in more power from less fuel

2.

The vibration free design with the twin balancer system and lighter reciprocating parts.

3.

Such with extralong teeth and the blower housing and muffler cover made

"DAMPING

4.

The automatic decompression system offers easy, dependable starting.

5.

The muffler air flow

4.

parts

as the large capacity muffler, dual element air cleaner, helical

SHEET"

and

much

easier

reduce noise

carburetor are located on opposite sides, making the arrangements for cooling

in

the design of power equipment.

GENERAL DESCRIPTION

to

and

a minimum.

OF

ENGINE

prolonged engine life.

COMPONENTS

type

of

balancer gear

resin laminated

4-1

The cylinder and crankcase aluminum diecasting. The cylinder liner, made of special cast iron, is molded into the aluminum casting. The crankcase has a mounting surface on the output shaft side, where the main bearing cover

is

4-2

The main bearing cover diecasting, which is mounted on the output shaft side of the crankcase. Remove the main bearing cover to inspect inside of the engine.

Pilots and bosses are machined on the cover

direct

machines as generators and pumps.

Oil

for

CYLINDER

attached. (See Fig.

MAIN

mounting

gauge (fillers) are on both

easy maintenance.

AND CRANKCASE

1.)

BEARING COVER

of

the engine onto such

is

sides

single piece

an aluminum

of

the cover

for

Fig.

1

-6-

fig.

2

4-

3

CRANKSHAFT

The crankshaft

crank pin

is

forged carbon steel, and the

induction-hardened. The output end of the shaft has a crankshaft gear and balancer gear that are pressed into position.

(See

Fig.

3.)

4-4

The connecting rod and bearings.

CONNECTING ROD

is

forged aluminum alloy,

its

large and small ends function as

The

piston

is

AND

an

aluminum

PISTON

alloy

casting, and carries two compression rings and

one

oil ring.(See

Fig.

4.)

B

TYPE

/

Fig.

D

TYPE

3

4-5

The

tile

mder

'l'he

PISTON RINGS

Piston rings are made

profile

SWOJI~

-

CUT:.

oil

ring

coil expander

(xmsumption.

of

the

ring

consists

far

top

has

better

ring

a

tapered

of

is

a

cutter

sealing

special cast

barrel

face

ring

and

face

with

and

less

iron.

and

an

oil

-7-

a

Fig.

4

5

.TOP

RING

SECOND

OIL RING

RING

4-

6

CAMSHAFT

The camshaft

for

the

D-

type engine is made of special cast iron and camshaft gears are casted together in one piece. Both sides of the shaft fit into the plane

on

bearings

the crankcase and main bearing

cover.

B-

The camshaft for forged

carbon

steel

type engine is made

and

also functions as

PTO

shaft.

is

Cam gear

press fitted on the shaft and ball bearings are employed on the both sides for supporting the shaft. (See Fig.

6.1

4- 7 VALVE ARRANGEMENT

The intake valve is located

on

flywheel side of the cylinder head. Hard alloy valve seats are moIded in the cylinder head

stellite

is

fused to the exhaust

and

valve face.

to

The cylinder baffle leads cooling air

the

exhaust valve area for the optimum cooling.

(See Fig.

7.)

of

I

Fig.

B

6

TYPE

4-8

The cylinder head

CYLINDER

HEAD

is

an

aluminum

die

which utilizes wedge type combustion chamber for the highest combustion efficiency.

-Fig.

(See

8.)

casting

VALVE

I

Fig.

7

Fig.

8

-8-

4-

9

GOVERNOR SYSTEM

The governor

is

a centrifugal flyweight

type

which ensures constant operation at the selected speed against load variations. The governor gear with governor weights installed in the crankcase balancer shaft. (See Fig.

4-

10

COOLING

The large fins

SYSTEM

on

the flywheel provide sufficient cooling air capacity

and

9.1

driven by the

is

area and cylinder. The cylinder baffle helps the cooling air flow efficiently.

Fig.

9

for

the inlet and exhaust

4-

11

LUBRICATION

A11

the rotating and sliding parts

by

Fig.

the

10.)

lubricated rod. (See

oil scraper

are

on

the connecting

splash-

I

OIL

SCRAPER

Fig.

10

-9-

4-

12

IGNITION

SYSTEM

The ignition system

is

a transistor controlled magneto ignition system which cosists of a flywheel and an ignition coil with a built in transistor mounted on the crankcase.

an

This system has easy starting. (See Fig.

4-

13

CARBURETOR

ignition timing advance for

11.)

The engines are equipped with a horizontal draft carburetor that has a float controlled fuel system and a fixed main The carburetors are calibrated carefully sure starting, good acceleration,

jet.

low

for

the

fuel

consumption and sufficient output.

For

the datails, refer to page

"8

CARBURETOR".

(See

Fig.

12.)

46,

section

I

Fig.

11

4-

14

AIR

CLEANER

The air- cleaner

is

a heavy - duty type with a

dual element system. (See Fig.

13.)

Fig.

12

I

Fig.

13

-

10

-

4-

15

BALANCERS

Unbalanced inertia force is balanced

by

the two

balancers which rotate at the same speed with

to

the crankshaft

(See Fig.

4-

16

An

automatic decompression mechanism which

14.)

DECOMPRESSION

effectively reduce vibration.

SYSTEM

opens exhaust valve before the piston reaches

top

is

compression

for

easy starting. (See

assembled on the camshaft

Fig.

15)

BALANCER

AUTOMATIC DECOMPRESSOR SYSTEM

Fig.

1

14

Fig.

I5

-

11

-

4-

17

SECTIONAL

VIEW

OF

ENGINE

FUEL

1

/FUEL

TANK

FLYWHEEL

(COOLING FAN)

-

12

-

'

MAIN

BEARING

COVER

PLUG

COVER

ROCKER

ARMS

DRAIN

PLUG

\BALANCER

-

13

-

SHAFT

2

5.

DISASSEMBLY

5-

1

PREPARATIONS

1)

When disassembling the engine, memorize the locations be

reassembed correctly.

tags

be

attached

2)

Have

3)

To

4)

Carefully handle disassembed parts, and clean them

5)

Use the correct

boxes ready to keep disassembed parts by group.

prevent losing and misplacing, temporarily assemble each

to

tools

AND

If

REASSEMBLY

SUGGESTIONS

yor are uncertain

them.

in the correct way.

of

individual parts

so

that they can

identifying some parts, it is suggested that

with

group

washing

oil

of

if

disassembed

necessary.

parts.

5-2

SPECIAL

Tool

209 - 95004

228-95003-07

No.

-

07

TOOLS

PISTON

Flywheel

Piston

RING

COMPRESSOR

/

puller

ring

Tool

with

bolt

compressor

Use

For pulling

For placing piston ring

off

the flywheel

Fig.

76

-

FLYWHEEL

14

-

PULLER

5-

3

DISASSEMBLY

PROCEDURES

Step

1

Part

Oil

to

remove

drain

(1)

(2)

Remove

To

discharge

gauge.

Procedures

oil

drain plug

oil

quickly,

and

drain

remove

oil.

oil

Remarks

Be

careful not

the gasket.

to

lose

14mm

Tool

box

wrench

Fig.

17

-

15

-

Step Part

I

2

Air

to

remove

cleaner

Procedures Remarks

(1)

Remove air cleaner cover.

(2)

Loosen

two wing

element.

(3) Loosen

choke

(4)

Remove two flange

screw on swivel and

knob.

and remove cleaner

M6

flange nut

M6

X

12mm

.-.-

bolt

and washer

bolts

and remove washer and gasket for

nuts

and a bolt

base.

2pcs.

*

pull

out

lpce.

Be

careful not

wing

bolt.

Pull

off

breather

from cleaner

to

base.

lose

pipe

lonun

Tool

box

wrench

CLEANER

M6

BASE

FLANGE NUT

WING

:

2pcs.

BOLT

M6

BOLT AND WASHER

CLEANER

COVER

Fig.

18

-

16

-

Step

-

3

4

Control panel and bracket

Carburetor

Procedures

(1)

Unclamp

(2)

Disconnect wires from connectors.

(3)

Loosen

wires

from breather cover.

two bolt and remove control

panel.

M5

X

(4)

Loosen.

lOmm

bolt

flange

and washer

bolt

bracket.

'

M6

x

8mm

frange bolt

(1)

Close fuel valve.

(2)

Disconnect fuel

(3)

Remove carburetor carefully governor rod and

pipe

from

rod

governor lever.

-*..

and

*

-0.

Ipse.

fuel strainer.

unhooking

spring

2pcs.

remove

from

Remarks

Be

careful not to bend

rod

governor

rod

spring.

or

stretch

8mm

box

lorn

box

Tool

wrench

Fig.

19

BRACKET

KEY

SWITCH

\

-

17

-

1

Step

]part

to

remove1

Procedures

I

Remarks

I

Tool

I

5

Speed

~

lever

~

governor lever

contral

and

(1)

Unhook

lever.

(2)

Remove clip, friction plate,

(3)

Loosen

lever.

governor spring

the

wing

and

bolt

nut,

speed

and remove governor

from

governor

stop

plate,

control lever.

Note governor spring hole on governor lever.

ROD

GOVERNOR LEVER

SPRING

I

GOVERNOR

SPRING

'ER

Fig.

20

-

18

-

Step

~~

F

'art to

rernovc

Procedures

I

Remarks

I

Tool

I

6

7

8

Oil

(Option)

Oil

bracket

(Option)

Muffler

M8

FLANGE

sensor

(1) Unclamp sensor cord from main

bearing cover.

(2)

Remove

oil sensor unit.

Remove oil sensor bracket.

(1

1

Loosen two flange nuts and a bolt.

(2) Remove muffler and muffler cover

from stud bolts.

NUT

M8 flange nut M8

X

:

Ppcs.

16mm

bolt and washer lpce.

2pcs.

Be very careful not to

damage stick and

sensor

Be careful not

unit in any way.

to

lose

muffler gasket.

12mm

box wrench

MUFFLER

COVER

Fig.

21

-

GASKET

19

-

M6

SCREW

SPRING

/

AND

WASHER

:

2~~s.

'art

to

Electric starter

(Option)

remove(

Procedures

(1)

Remove black wire from electric starter.

(2)

Loosen two bolts and remove electric starter.

M8

x

30mm

M8

washer

M8

spring washer

..........

bolt

~ ~~~

.*.-

2pcs.

-

2pcs.

I

Reattach terminal nut

to

from

Remarks

starter

missing.

~~

to keep

it

12mm

wrench

Tool

socket

Diode rectifier

Magnetic

(1)

Disconnect wires. green/white

white

(2)

Remove

from crankcase.

M6

Loosen two flange bolts and remove magnetic switch. switch

M6

X

ELECTRIC

...........

X

12mm flange bolt

STARTER

* - *

diode

-

2

1

rectifier and bracket

-.*-

lpce.

....

2pcs.

\

lOmm

box wrench

Fig.

22

MAGNETIC SWITCH

M6

FLANGE

-

20

-

BOLT

:

2pcs.

BLACK WIRE

/

Step

Part

to

remove

Procedures

Remarks

Tool

12

Fuel

tank

Loosen

fuel

tank

M8

flange

four

and

flange

nut

nuts

remove

-0.-

4pcs.

fuel

from

tank.

bottom

of

Wipe

thoroughly.

off

spilt

fuel

12mm

wrench

socket

FUEL

TANK

STRAINER

Fig.

23

-

21

-

Step

13

14

Part

to

Recoil

starter Blower Remove

housing

remove Procedures Remarks

Remove

M6 X 8mm

M6

x

8mm

recoil

flange

blower

flange

from

bolt

housing

bolt

blower

-

from

.-.-

housing.

-

4pcs.

crankcase.

4pcs.

lOmm

1Omm

Tool

box

wrench

BLOWER

\

HOUSING

1

/

Fig.

24

-

22

-

Step

Part

to

remove

Procedures

Remarks

Tool

15

Ignition

coil

(1) Remove

spark

plug cap from spark

Plug-

(2)

Remove ignition coil

M6

x

30mm

~ ~~~ ~~ ~ ~~ ~ ~~ ~~ ~~~~ ~

Fuel

tank

Bracket

Cylinder baffle

I

Remove the fuel tank bracket

M10

x

25mm bolt and washer

Remove the cylinder

M6 x 8mm

I

FUEL

bolt

flange

bolt

TANK BRACKET

and

M10

baffle

FLANGE

from

crankcase.

washer

..a-

1.-

4pcs.

from cylinder.

lpce.

BOLT

*

2pcs.

SPARK

:

4pcs.

I

PLUG CAP

\

I."""'""

lOmm

14mm

lOmm

I

box

wrench

M6

CYLINDER

/

FLANGE

BOLT

BAFFLE

/MI3

BOLT AND WASHER

PPCS.

I

Fig.

25

-

23

-

Step

18

-

19

'art

to

remove

Flywheel

Charge coil

Procedures

(1)

Remove nut from crankshaft. M16

nut

(2)

Remove the starting pulley. M8

x

12m bolt

(3)

Remove flywheel

(See

Fig.

(4)

Remove the key from crankshaft.

(See Fig.

Remove the charge coil

M6

X

20mm

M6 x 1Omm screw

28.1

29.)

screw

lpce.

-

--..

(See

-*--

using

-

2pcs.

lpce.

3pcs.

flywheel puller.

Fig.

26.)

Remarks

Flywheel removed the head of the center bolt of the flywheel puller

Be careful the key.

with

can

by

a

not

easily

striking

hammer.

to

lose

be

Tool

24mm

wrench

12mm socket

wrench

Phillips

socket

screwdriver

I

Fig.

28

I

-

24

-

Fig.

29

I

Step

\Part to removeJ

Procedures

1

Remarks

I

Tool

Exhaust manifold

Intake

manifold

I

Remove exhaust manifold and gasket from cylinder head. M8

flange

Remove intake manifold and gasket cylinder head.

M8

x

Remove

I

28mm

spark

nut

- - - -

bolt

plug

2pcs.

and

from

,

SPARK

washer

cylinder

PLUG

- -

*

2pcs.

head.

from

I

12mm

I

box

wrench

M8

FLANGE

NUT

:

ZPCS.

Fig.

30

-

25

-

'art

to remove

Procedures

Remarks

Tool

Cylinder

head

(1)

Remove rocker cover head.

M6

x

12mm flange bolt

Loosen

(2)

(3)

Pull side

(See

(4) Remove

(5)

Remove cylinder head

M10

adjusting bolts on rocker

out

rocker

of

the cylinder head.

FIg.

31.)

the

push

X

75mm

M10 x 42mm flange bolt

from

....

4pcs.

shaft from the intake

rods

from cylinder.

and

gasket.

flange

bolt

..*.

--e-

cylinder

arms.

4pcs.

lpce.

Mark rocker push rods reinstalled

arms

so

in

original positions.

and

they be

their

10mm

14mm

box

wrench

-

26

-

I

Step

l~art

to

remove1

YtZzz

exhaust

r

Procedures

(1)

Press down spring retainer and slide

it

to release from the groove stem, then remove valve spring.(See

(2)

Remove intake and exhaust valves from cylinder head.

~~ ~~ ~~ ~

Remove breather cover.

M6

x

12mm

Remove gasket ( Breather cover). breather plate and gasket (Breather plate).

flange

t

Fig.

bolt

spring

32.)

*.-.

of

retainer and

2pcs.

valve

Remarks

Put marks on valves, springs and retainers

they

be

reinstalled

their

original

Clean deposit

valve

guides. Inspect valves, valve

seats

Be careful of stem

on

carbon

seats,

and guides.

intake

from

valve.

positions.

and

the valves,

ports

so

in

gum

and

seal

Tool

SPRING RETAINER

VALVE SPRING

WASHER

OIL

SEAL

VALVE GUIDE

r

Fig.

33

GASKET

(BREATHER PLATE)

BREATHER PLATE

BREATHER COVER

M6

-

27

-

FLANGE

BOLT

:

2pcs.

\

RUBBER

PIPE

Step

Part

to

remove

Procedures

Remarks

Tool

,26

h4ai.n

(1)

bearing

cover

(2)

Fig.

Remove

cover

M8

x

4Omm

on

Remove

crankcase.

35

bolts

fastening

crankcase.

bolt

main

(See

bearing

Fig.

and

35.)

main

washer

cover

I

bearing

,

Be

~

damage

*--*7pcs.

from

Use

evenly

outer

careful

the

a

soft

tap

surface

not

oil

to

seal.

hammer and

around

of

cover.

12mm

box

wench

MAIN

BEARING COVER

GASKET

‘

M8

BOLT

AND

WASHER

:

7pcs.

Fig.

36

-

28

-

Step

Part

27

~

c

1

28

to

remove

Camshaft

tappets

and

Balancer

Procedures

(1)

Remove camshaft from

(2)

Remone

(I)

Position

remove balancer

tappets

piston

crankcase.

from crankcase.

at top dead center

1

and

balancer

and

2.

Remarks

(I)

To

prevent from getting put crankcase cylinder side

down.

(See

Fig.

37.)

(2)

Put

marks

to

distinguish

from

exhaust.

tappets

dynages

on

tappets

intake

Tool

,

Fig.

37

-

29

-

Fig.

38

I

Step

l~art

to

remove1

29

CoMfXthg

rod

and

piston

II

30

Piston piston pin

and

(1)

Remove connecting rod

COMfXting

(2)

Turn

dead center,

and

piston assembly

cylinder.

(1)

Remove clips and piston pin to remove connecting rod

(2)

Remove piston

Procedures

rod

crankshaft

~~

cap.

until

piston

push

out connecting rod

through

from

rings

from

bolts

is

top of

piston.

and

at top

I

Scrape

deposits that interfere with removal

of piston from upper end

Be

damages to piston and COMecting rod.

Be

rjngs

much

Remarks

off

all

of

cylinder.

careful

careful not .to

not to give

by spreading too

or

twisting.

carbon

might

break

I

lOmm

I

Ring

~

expander

Tool

box

wrench

I

PISTON PIN

CONNECTING ROD

1

PISTON RING

CONNECTING

OIL

SCRAPER

M8

BOLT

:

2pcs.

Fig.

39

-

30

-

Step

31

t

Part

to

remove

Crankshaft

(1)

Tap

crankshaft

(See

Fig.

40

lightly

Fig.

40.)

Procedures

on

flywheel

to

move

from

end

of

crankcase.

Remarks

Tool

-

fig.

41

-

31

-

5-

4

REASSEMBLY PROCEDURES

0

PRECAUTIONS FOR REASSEMBLY

1)

Clean parts throughly before reassembly. Pay most attention to cleanliness of piston, cylinder, crankshaft, connecting rod and bearings.

2)

Scrape

3)

Check lip of oil seals. Replace

off

all carbon deposits

from

oil

cylinder head, piston top and piston ring grooves.

seal if the lip

is

damaged.

Apply oil to the lip before reassembly.

4)

Replace all the gaskets with new ones.

5)

Replace keys, pins, bolts, nuts, etc., if necessary.

6)

Torque bolts and nuts to specification refering

7)

8)

Apply

Check

oil to rotating and sliding portions.

and

adjust clearances and end plays where specified in this manual.

to

the

"TORQUE SPECIFICATIONS".

5-4-

1

CRANKSHAFT

(1)

Install crankshaft on crankcase using seal guide to avoid damage to oil seal. (See

Fig.

42.)

(2)

Install woodruff key for flywheel on crankshaft.

5-4-2

(I)

PISTON

AND

PISTON RINGS

Install oil ring first, then second ring and top ring. Spread ring

far enough

to

only

piston and into correct groove. Use care not to distort ring. (See Install top

ring

Fig.

43.)

and second ring with

punched mark beside the gap on the

side.

(See

Fig.

45.)

an

oil

slip over

top

OIL

SEAL

OPEN

GUI

ENDS

Fig.

42

OF

f

PISTON

RING

-

32

Fig.

43

-

I'

fig.

44

.TOP

RING

.SECOND RING

'OIL

RING

"N"

Fig.

MARK

45

5-4-3

PISTON

AND

CONNECTING

When installing piston on connecting type engine, match the mark with the mark On

B

type

engine,

piston with the mark

(See

Fig.

46.)

Oil small end

of

DF"on

match

"

@

connecting rod before installing

"DF"on

connecting

the mark

BF"on

"BF"

connecting

piston and piston pin.

Use

clips on the both side

of

the piston pin to

secure piston pin in position.

ROD

rod

on

thepiston

rod.

on the

D

rod.

"OF"

Fig.

MARK

A

46

-

33

-

(2)

Install piston and connecting rod assembly into cylinder.

Use

a

piston ring compressor to hold piston

rings.

The

"DF"mark

"D"type

engine

is

assembled. (See

of

the connecting rod

or

the "BF"mark for

to face flywheel side when

Fig.

47.)

"B"

for

type

PISTON RING COMPRESSOR

\

CON,NECTlNG

ROD

-[NOTES]

(1)

Apply enough oil to piston rings, connecting

rod bearings and cylinder bore before

assembly.

(2)

Set gaps apart from one another before assembly.

(See

Fig.

of

the piston rings

48.1

90

degrees

Fig.

47

48

0

"-F

CRANKCASE

(FLYWHEEL

RING

SlOC),

RING

5-4-4

(I)

(2)

(3)

CONNECTING

ROD

Turn crankshaft to bottom dead center,

lightly

of Install connecting to connecting marks. (See Torque connecting M8

I

Check

by

tap top

of

the

piston until large end

the rod meet crankpin.

rod

cap

and oil splasher

Fig.

X

46

mm connecting

Tightening torque

225-275

22.1

"27.0

16.3-1

for

kg

N

9.9

ft

free movement

rod

matching alignment

49.)

rod

bolts

I

cm

-

m

*

Ib

rod

of

turning crankshaft slowly.

to

specification.

bolt

-*

connecting

-0

2pcs.

rod

ALIGNMENT MARK

Fig. 49

-

34

-

5-4-5

BALANCER

SHAFT

Install balancer shaft 1 (left side) and balancer shaft matching marks

as

Matching mark and that

2

(right side) to crankcase aligning

shown in Fig.

for

balancer shaft

of

balancer gear and crank gear

50.

for

balancer shaft

2

1

is

two dots.

one dot

Align the same marks on balancer gears and crankgear.

(1)

When installing balancer shaft that governor gears mesh properly to drive gears

(2)

incorrect timing of the gears

malfunction in damage due to interference parts.

on

balancer shaft.

of

the engine and may results

2,

will

be sure

cause

of

the

fig.

50

5-4-6

(1)

TAPPETS AND CAMSHAFT

Oil tappets and install

in

their original

position.

to

Push in fully

avoid damage during

camshaft installation.

(2)

Lubricate bearing surfaces

Align timing mark

on

of

camshaft.

crankshaft gear

with

timing mark on camshaft and install

camshaft

Incorrect valve timing will cause malfunction

of

the engine.

in

the crankcase. (See

Fig.

52.)

Fig.

51

-

35

-

5-4-7

(1)

ADJUST CRANKSHAFT

AND

Measure end play of crankshaft and camshaft.

Adjust end play to the specified values

CAMSHAFT

using

END

PLAY

the proper spacer.

SIDE

CLEARANCE

ADJUSTING

SPACER

*

Take the thickness

the

side clearance.

CRANKSHAFT

Type

D

0-0.2

T

mm

=

0.6

mm

=

0.8

mm

=

1

.O

mm

of

GASKET, BEARING

Type

0-0.2

T

CRANKSHAFl

=

0.6

0.8

1:0

rnm

mm mm

mrn

B

COVER

CAMSHAFT

Type

D

0.1

3-0.29

T

=

T

=

T

=

0.6

0.7

0.8

m m

mm mrn mrn

into account as

Type

0-0.2

T

=

T

=

T

=

0.26mm

0.6

0.7

0.8

when

8

rnm

mm

rnrn

calculating

MAIN BEARING

\

GASKET. BEARING COVER

COVER

I

SPACER

\

SPACER

CRANKCASE

Fig.

52

-

36

-

(2)

Lubricate oil seal and bearing surfaces. Add a light film of oil on main bearing cover face to

hold

Place spacers chosen at procedure

gasket in place.

(1)

on crankshaft and camshaft. Use an oil seal guide when installing main bearing cover to avoid damaging the seal. Tap cover into place with a soft hammer.

M8

X

40

mm

Main bearing cover

bolt and washer

Tightening torque

***e

7

pcs.

5-4-8

BREATHER VALVE

170-190

16.7-1

7

12.3-L.13.7

8.6

kg

N

ft

*cm

m

4

Ib

Attach breather plate (breather valve) and breather cover to crankcase using proper gaskets.

Put

breather plate in such position as its reed valve opens outside towards main bearing cover.

Replace gaskets with new ones

5-4-9

(1)

CYLINDER HEAD

Clean carbon

and

gum deposits from

if

they are torn

or

damaged.

the

valves, seats, ports and guides. Inspect valves, valve

seats and valve guides.

(2)

Replace valves that are badly burned, pitted

(3)

When installing valves in cylinder head, oil valve stems and insert them into valve guide.

or

warped.

Then place cylinder head on flat table, install washer, valve spring and spring retainer.

(4)

Valve guides should

"SERVICE

DATA"

be

replaced when valve stem clearance exceeds specifications

)

.

Draw valve guides out and press new guides in. Refer to

"SERVICE

DATA"for clearance specifications. After replacing valves and guides, lap valves in place until a uniform ring shows around the face

of

the valve. Clean valves

(5)

Install cylinder head

to

cylinder with new head gasket. Tighten five flange bolts evenly in three steps by the following tightening torque Cylinder head M10

X

75

M10x42

mm

and

wash cylinder head thoroughly.

bolt

0

bolt*-*-

4

1

:

pcs.

(See

I

5-4-

(1)

Insert push rods into crankcase. Put push rod

(2)

Apply

100

9.8

7.2

10

1st

step

kg*cm

N.

m

ft

*

Ib

ROCKER

oil

ARMS

tip

to rocker arms and assemble them to cylinder head using rocker shaft and spacer.

Tightening torque

I

2nd

step

200

kg

*cm

19.6

N

m

14.5

ft

-

Ib

AND PUSH RODS

I

340-420

33.3-41.2

I

24.6-30.4

final

in the hollow of tappet top.

-

37

-

step

kg

N

ft

cm

m

Ib

1

I

5-4-

11

VALVE CLEARANCE ADJUSTMENT

(1)

Position piston at top dead center compression stroke

of

flywheel with the mark

crankcase. (See Fig.

(2)

Loosen lock nut on rocker arm

by

matching the mark

53.)

adjusting screw to adjust the clearance between rocker arm and valve stem end.

(See

Fig.

54.)

Tighten

-

[NOTE]

lock

nut.

and

T

turn

of

Fig.

53

Check and adjust valve clearance cold.

of

x

valves

12

or

Check operation crankshaft Remeasure tappet clearance.

(3)

Install rocker cover and gasket. Rocker

5-4-12

Install Spark plug

New

120-150

11.8-14.7

8.7-1

.

cover

SPARK PLUG

spark

:

NGK

spark

0.9

plug

M6

to cylinder head.

BPGES

Tightening

plug

kg

-

cm

N

rn

ft

*

Ib

by

mm

bolt

CHAMPION

toque

Retightening

230-270

22.6-26.5

16.6-1

with

-0

0.

9.5

engine

turning

4

pcs.

N9Y

kg

cm

N

rn

ft

*

Ib

Fig.

54

5-41

13

(1)

Install intake Tighten

I

1

100-140

(2)

Install exhaust Tighten

I

180-220

INTAKE AND EXHAUST MANIFOLD

three

kg

two

kg

pipe

-cm

flange

-

cm

bolts.

pipe

to

cylinder

Tightening toque

1

to

9.8-

cylinder head

nuts.

Tightening toque

I

17.7-21.6

head

13.7

N - m

N

with

-

rn

gasket.

I

gasket.

I

-

38

7.2-

10.1

13.0-15.9

-

ft

I

*

Ib

I

1

Ib

1

(1)

Install charge coil to crankcase. Clamp coil wire to crankcase.

I-

[NOTE]

Be careful

charge

(2)

Put

coil

woodruff

not to

and

pinch coil wire between

crankcase.

key in keyway of crankshaft.

Wipe off oil and grease thoroughly from

of

tapered portion

crankshaft and flywheel

center hole.

(3)

Install flywheel to crankshaft.

Tighten flywheel nut with spring washer.

Fig.

(See

850-960

(4)

Install starting pulley to flywheel.

70-90

5-4-15

55.)

kg

cm

kg

cm

CYLINDER

BAFFLE AND FUEL TANK BRACKET

Install cylinder baffle and

Tightening toque

83.4-93.2

Tightening togue

6.9-

8.8

fuel

N

m

61.5-68.7

5.1

-6.5

tank bracket to cylinder head.

ft

Ib

Fig.

55

5-4-

16

IGNITION

COIL

Install ignition coil to crankcase. Adjust air gap between ignition coil and

a

flywheel using bolts. (See Fig.

I

5-4-

(1)

Attach blower housing to crankcase.

Air

0.3-0.5

0.01

2-0.020

17

BLOWER HOUSING AND RECOIL STARTER

thickness gauge and tighten

56.)

gap

mm

in.

Tighten four flange bolts.

(2)

Install recoil starter

M6

x

8mm

[NOTES]

flange bolt

to

blower housing.

-0

4

pcs.

Fig.

56

Be

careful

r

of

pulling direction of starter rope.

-

39

-

5-4-18

Install fuel

5-4-

(1)

(2)

(3)

(4)

FUEL

19

ELECTRIC

Install magnetic

tank

TANK

to

fuel tank bracket.

STARTER

switch

(Optional equipment)

to crankcase.

Install diode rectifier to crankcase. Install electric starter to crankcase. Connect

wires

referring to the wiring diagram.

5-4-20

MUFFLER

hstall muffler to exhaust pipe with muffler gasket.

5-4-21

(1)

(2)

(3)

OIL

Install

sensor

oil

Screw in

SENSOR

(Optional equipment)

bracket to crankcase.

sensor

unit

to

probe into the

sensor bracket.

oil

filler.

Type ‘D”engines : Insert sensor probe into

the muffler side filler neck.

Type ‘B-engines

:

Insert sensor probe into carburetor side.

D

TYPE

MUFFLER

SIDE

Fig.

57

CARBURATOR

SIDE

5-4-22

(1)

GOVERNOR,

SPEED CONTROL

Install governor lever to governor shaft.

Tighten locking bolt temporarily.

(2)

Install

speed

control lever

to

crankcase

return spring, friction washer, wing nut, etc.

Fig.

as shown in

(3)

Hook governor spring to proper holes

58.

governor lever and speed control lever.

.(See

Fig.

SI.)

(4)

Install insulator and gaskets to intake pipe.

SYSTEM

with

of

-

SPEED

40

CONTROL LEVE

-

STOP PLATE

fig.

58

’

WASHER

t

(5)

Install carburetor to intake pipe hooking governor rod to governor lever and throttle lever of carburetor. governor

(See Fig.

(6)

Attach panel bracket and air cleaner base

rod.

59.)

Hook

rod spring over

to carburetor with gaskets.

Tighten two flange nuts

and

a bolt. Connect breather pipe from tappet cover to cleaner base.

(7)

Adjust governor system.

(a)

Push

the high speed position and tightening wing nut. (See Fig.

(b)

Check that governor lever

speed control lever

all

the

is

way

fix

it by

60.)

pulled by

governor spring and carburetor throttle

is

valve

fully open.

(c) Turn governor shaft counterclockwise all

the way using a screw driver, and tighten

on

lock bolt to secure the lever

(See

Fig,

60.)

the shaft.

to

~.

-GOVERNOR

R

Fig.

59

Fig.

60

HOOKING

Rated

POSITION OF

3000

rpm

(50Hz)

THE

GOVERNOR

applications

:

1

-A

SPRING

*

Rated

3600

rpm

(60Hz)

applications : 3-

Governor spring material : Stainless steel Governor spring material : Zinc plated steel

:

Color

Silver Color : Gold

Fig.

61

B

-

41

-

(8)

Install control panel to bracket. Connect wires.

(9)

Put choke knob wire through grommet on cleaner base and fasten

of

carburetor.

(10)

Put element into air cleaner and fasten with wing Install air cleaner cover.

-

End of the reassembly

5-

5

BREAK-

An

engine that has been completely overhauled and connecting rod should be throughly Good bearing surfaces and running clearances between the various parts can only be established

by

operating the engine under reduced speed and loads While the engine Make final carburetor adjustment and regulate the engine operating speed.

IN

OPERATION

is

being tested, check

-

by

being fitted with

RUN-IN

for

oil leaks.

before being put back into service.

bolts.

for

a

short period

to

swivel on choke shaft

a

new piston, rings, valves

of

time.

I

6.

6-

The ignition system characteristic.

Being different from the breaker point type ignition system, this system is completely free from such troubles as starting-up failure

The electronic automatic advancing ensures extremely easy starts and stable high performance

at.

Steps

I

MAGNETO

1

.FLYWHEEL

operating speed by advancing the ignition timing to the most suitable point.

MAGNETO

of

the

EH30./EH34

Load

owing

is

pointless flywheel magneto

to dirty, burnt or corroded point surface.

with

automatic advancing

-

42

-

6-2

(1)

(2)

BASE

Revolution the base current Current

THEORY

of

the flywheel generates electricity on the primary side

I1

flows to the power transistor.

I1

turns the power transistor "0N"and the electric current

of

the ignition coil, and

Iz

flows.

At lower engine revolution, when the flywheel reached the ignition point the low speed ignition

run

timing controll circuit operates to

allowing the current

At

this

moment the power transistor turns "0FF"and the current

I1

to bypass as current

the base current

14.

13

to turn the signal transistor

I2

is

abruptly shut resulting

in the high voltage generated in the secondary coil which produces sparks at the spark plug.

(3)

At higher engine revolution, the advancing controll circuit operates at the 1 ignition timing to

k

run the base current

as current At this moment

Is.

the

to turn the signal transistor

power transistor

turns

"0FF"and

B

"0N"allowing the current

the current

Iz

is

abruptly

I1

shut

to

in the high voltage generated in the secondary coil which produces sparks at the spark plug.

of

The operating timing of engine speed resulting in the advancing

the advancing controll circuit advances in accordance with the increase

of

ignition timing

as

shown in Fig.

62

A

"ON"

bypass

resulting

(b).

-

(B.T.D.C.)

43

-

ELECTRONIC ADVANCING FLYWHEEL

MAGNETO SYSTEM

c

,

STEP

ADVANCING

500

1000

ENGINE REVOLUTION

Fig.

2000

62 (b)

3000(r.p.m.)

6-3

WIRING

STANDARD

775-

DIAGRAM

Spark

Plug

-.

c

I

"

Ignition

!

Flywheel

Coil

Connector

Stop

Button

Black

-1

ElNGlNE

I I

I

L

"""""""-

WITH

ELECTRtC

\

STARTER

DIODE

RECTIFIER

1

l-

1

2VOLT

BATTERY

MINIMUM

24

AMP.HR.

I

r

Fig.

63

-

44

-

7.

AUTOMATIC

DECOMPRESSION

SYSTEM

The decompression system operates to release compression

by

lifting up the exhaust valve at starting. The release lever mounted on the camshaft has a flyweight at one end and a crescent cam at the other end. When starting the engine, the crescent cam juts out from the exhaust cam. The exhaust tappet rides over the crescent cam opening the exhaust valve to release

CRESCENT

EXHAUST

Fig.

64

compression.

LEVER

When the crank speed reaches a certain revolution, the flyweight by the centrifugal force turning the release lever to retract

a

valve closes allowing

The

components

CRESCENT

EXHAUST

CAM

of the decompression system

however the principle

sufficient compression for

FLYWEIGHT

Fig.

of

operation

is

the same.

are

the

engine

65

different between “D”type and

of

the

release lever moves outward

the

crescent cam. Thus the exhaust

to

start

up.

RELEASE LEVER

CAMSHAFT

“B”type

engines,

-

45

-

8.

CARBURETOR

8-

1

OPERATION

AND

CONSTRUCTION

8-1 - 1

The float chamber body and, with a float and

maintains

operation. (See The fuel flows from the fuel tank chamber through needle valve. When the to a specific level, the float rises, and when

buoyancy

FLOAT

a

and

SYSTEM

is

located below the carburetor

constant fuel level

Fig.

66.)

fuel pressure are balanced, the

a

needle valve,

during

into

the float

fuel

engine

rises

its

needle valve closes to shut off the fuel, thereby

keeping the fuel at the predetermined level.

PILOT

OUTLET

BY

-

\I

\

PASS,,

I

[

!

.

"_

[

I

-

MAIN

PILOT AIR JET

-

- - "-

-

"_

\

AIR

JET

Fig.

66

PILOT JET

-"

"

-

- -

Fig.

-

67

""-

-

MAIN

"

"""-

-

- - -

-

-\

f"

"

MAIN JET

\

AT

-

46

-

8-1

-2

PILOT SYSTEM

The pilot system feeds the fuel to the engine during idling and low- speed operation. The fuel air metered

fed through the main

by

the pilot air jet.

jet

to the pilot jet, where

it

is

metered, and mixed with

the

is

The fuel- air mixture is fed to the engine through the pilot outlet and the by- pass. At idling speed, the fuel is mainly fed from the pilot outlet.

8-

1-3

MAIN

SYSTEM

The main system feeds the fuel to the engine at medium- and high-speed operation. The fuel

is

metered by the main jet and fed to the main nozzle. The air metered

by

the main air jet is mixed with the fuel through the bleed holes in the main nozzle, and the mixture atomized out of the main bore. It

an

optimum fuel-air mixture, which

8-

1

-4

CHOKE

The choke

is

used for easy start when engine

is

mixed again with the air taken through the air cleaner into

is

supplied to the engine.

is

cold. When the starter

is

operated with a closed choke, the negative pressure applied to the main nozzle increases and draws much fuel accordingly thus easily start up the engine.

is

:

8- 2 DISASSEMBLY

Apart

from

mechanical failures, most ratio, which may arise mainly due to a clogged variations.

In

order to assure proper flow of air and fuel, the carburetor must be kept clean at

AND

REASSEMBLY

of

carburetor troubles are caused

by

up

air or fuel passage in jets, or fuel level

an incorrect mixing

all times. The carburetor disassembly and reassembly procedures are as follows

8-2-1

(1)

(2)

THROTTLE

SYSTEM

Remove the philips screw

valve The spring

(2),

and pull out the throttle-> shaft

(4)

can be taken out by removing

the throttle stop screw

(5).

(1)

and

throttle

(3).

123

*Exercise care not to damage throttle valve

ends.

8-2-2

(1)

(2)

CHOKE

Remove the philips screw

(71,

and pull out the choke shaft

SYSTEM

(6)

and choke valve

(8).

When reassembling the choke shaft, make sure that the cutout in the choke valve faces the main air jet. Meantime, when reassembling set the rings and

(10)

at the right position.

(9)

l7”---i

16

19

@“----

LZ2

:

(See

Fig.

23

68.)

8-2-3

(1)

PILOT

SYSTEM

Remove the pilot jet

(1

l).,

using correct tool

to avoid damage to it.

(2)

Reassembly Tighten the pilot jet securely. Otherwise, the fuel may leak, causing engine malfunction.

-

47

13

<a

18

12

“--&

-

&

Fig.

68

8-2-4

(1)

(2)

(3)

MAIN SYSTEM

Remove the bolt (12) and take out float chamber body From the

guide holder

body

(17)

(14)

remove the main nozzle

from

the main nozzle

(15).

(15),

and then remove the main jet

Reassembly

(13).

(16)

a) Fasten the main jet securely to the body. Otherwise, the fuel may become too rich and cause

engine malfunction.

b)

The bolt tightening torque is

(

chamber

13).

70kg

-

cm. Be sure to set the gasket

(19)

and washer

(18)

and

for

8-2-5

(1)

FLOAT SYSTEM

Pull out the float pin (20) and remove the float (21) and then remove the clip (22) and needle valve

(23).

If the needle valve need to be replaced, replace it with rubber needle.

When cleaning the jets, use neither a

orifice which will adversely affect fuel clean.

(2)

When removing the needle valve

slender than the float

and remove, since the float

drill

nor a wire (because of possible damage of the

flow).

and

float, gently tap the reverse side using the rod more

Be

sure

to

use compressed

is

air

to

calked to the carburetor

blow

them

body.

-

48

-

9.

STARTING

SYSTEM

9-1

RECOIL

STARTER

When repairing recoil starter, disassemble and reassemble in the following procedures.

:

Tools

Socket wrench, Needle nose pliers, Screw driver

[NOTE]

The following explanation

For

“B”

type models, reverse the direction

9-1

-1

HOW

(1)

Remove recoil starter from engine.

(2)

Pull

for

30-40cm to line

outlet

Hold

TO

DISASSEMBLE

starter

hole

knob

for

starter rope.

reel with thumb

and pull out starter rope

is

applicable to the recoil starter

of

rotation

(D

Type)

up

notch on reel with

and

pull

starter rope

for

“D”

type engines.

to

achieve proper service work.

TARTER

ROPE

inside the starter case with screw driver.

(See Fig.

69.)

Rewind reel clockwise until the rotation stops. When rewinding the reel, control the rotation by holding starter rope using the notch on the reel and pressing the reel with

I

Fig.

69

thumb.

(3)

Remove parts in the

1.

Center screw

2.

Friction plate

3.

Friction spring

4.

Ratchet

5.

Ratchet spring

following

order.

4,

Fig.

70

-

49

-

(4)

Remove reel from starter case as shown in

Fig. 71.

Take out reel

slowly

turning

it

toward left and right to remove spring from

Do

the hook.

or

the

spring

not remove the reel quickly

may

escape

from

the starter case. Untie starter rope from the knob and remove.

lightly

9-

1-2

HOW

(1)

Put starter tie it as shown in

TO

REASSEMBLE

rope

through

Fig.

tightly for the safety sake.) Put the opposite side starter case and reel. Tie

end

as starter knob

and put the

reel complely.

(2)

Check

that

spring

is

securely set in the Adjust the position of inner end spring

so

it hooks

on

case securely.

The

shape of starter spring inner end can

be adjusted with plier

(D

Type)

starter knob and

72.

(Tie the rope

of

the

rope

through

it

in the same way

knot

in

of

hook in the starter

if

necessary.

the

reel.

the

pg'

Fig.

STARTER

71

72

OUTER END

CASE

OF

SPRING

BEARING

INNER END

-

50

-

OF

SPRING

Fig.

73

KEEPER

REEL

(3)

Prior to installing reel in starter case, wind

starter rope in reel for arrowhead direction as shown in Then let the rope out on reel. Line up the hook with inner of spring and install reel in starter case. Check that the inner end securely hooked onto the

(4)

Reassemble parts in reverse order of disassembly. Check that ratchets are pushed by ratchet springs toward the center Install friction plate with its two bosses set

inside

Apply small amount

screw and torque

of

the bent portion

it.

2.5

turns in the

of

reel from

of

spring is

hook.

of

recoil.

of

rachets.

of

lock- tight to center

Fig.

the

74.

notch

end

Thightening

4.0

3.9

1

(5)

Hold

turn reel 4 times in the arrowhead direction. Firmly press turn and pull starting knob

rope

Return knob slowly to let starter rope rewind in

2.9

starter rope as

out

kg

N

ft

of

reel.

torque

cm

m

Ib

the

reel

starter

shown

not

case.

in

Fig.76

to

allow reverse

to

let starter

and

Fig.

75

76

-

51

-

(6)

Test operation of recoil starter to see

if

rope recoils satisfactorily and ratchets project and

retract properly. Mount recoil starter to the engine.

(7)

If

spring escapes from reel when disassembling recoil, hook the outer end of spring onto the

notch of reel and rewind the spring into the housing.

(8)

Lubricate the rotating parts, sliding parts and spring with heat resistant grease

oil when reassembling recoil

and

prior to long term storage.

or

mobile

9-2

9-

(1)

ELECTRIC

2

-

1

DISASSEMBLY

The

6mm

STARTING

MOTOR

terminal nuts (2pcs.)

Remove the 6mm terminal nuts. (Zpcs.)

(2)

"M"

terminal bush

(3)

The 5mm through bolts Remove the

"M"

The rear cover the

5mm

through

No,l

(Zpcs.)

terminal bush

is

disassembled by removing

bolts.

(2pcs.I

(OPTION)

No,

1.

I

Fig.

77

Fig.

78

-

52

-

(4)

The

rear

Remove

cover

the

rear cover.

Fig.

4

79

(5)

(6)

(7)

4mm

The

brush holder.

The

terminal bush

"M"

brush

The

,ing

mov Remove the

(8)

Yoke assembly. Remove the

screws (2pcs.I

holde

the

4

mm

"M"

terminal bush

yoke

No,

2.

is

disassembled

screws. (Zpcs.)

assembly.

No,

by

2.

re-

6

Fig.

7

80

fig.

81

-

53

-

(9)

The pinion stopper clip. The pinion stopper clip

is

removed standard screwdriver while the pinion stopper

(1

0)

Pinion

(I

1)

Pinion return spring.

(1

2)

Pinion assembly.

The

is

pushed

toward

the pinion.

stopper.

pinion stopper, pinion return spring

and the pinion assembly can be dis

assembled once the pinion stopper clip has

been removed.

with

a

-

11

Fig.

82

12

\

(13)

Armature.

(14)

Thrust washers (4pcs.)

(15)

Front cover. The armature, thrust washers

cover

and the yoke assembly can

disassenbled once the rear cover.

(4pcs.).

front

be

Fig.

15

Fig.

83

-

J

84

-

54

-

9

11

\L

12

15

I

14

'2

2

0

d3

nlmml

13

14

1.

The

6mm

2.

"M"

terminal bush

3.

The 5mm through bolts

4.

The Rear cover

5.

The

4mm

6.

The brush holder

7.

"M"

Terminal

8.

Yoke assembly

terminal nuts

screws

bush

8

No,1

(2pcs.)

No,

2

(2pcs.)

9

5

Fig.

85

9.

The

10.

Pinion stopper

1 1.

Pinion return spring

12.

Pinion assembly

13.

Armature

14.

Thrust washers (4pcs.)

15.

Front cover

6

pinion

stopper

\

clip

4

-

55

-

9-2-2

(1)

a)

INSPECTION

ARMATURE

Check the diameter of the commutator.

If

the out side diamaeter

tator

replace it.

I

is

Standard

below the minimum

(New)

AND

REPAIR

I

Limit (Used)

of

the commu-

Iimit

Unit

then

:

mm

I

30

b) Continuity test

Use

between parallel points on the commutator. If

a

There

tester to check

is

for

the armature coil.

continuity, the armature

29

for

continuity

good.

No

continuity : (Disconnected coil)

Replace the arma ture.

is

still

TESTER

Fig.

86

for

c) Insulation test

Use a tester to check between a point the shaft If There is no continuity, the armature still good.

-

Continuity exists

or

the core.

the armature coil.

for

on

the commutator and

:

(Short circuited coil)

Replace the armature.

continuity

is

TESTER

,o,

Fig.

87

88

-

56

-

d)

Check for Surface Distortion on the Arma-

and

ture Use a of the out

and

core limit, then repair or replace

the Commutator.

dial

gauge to measure the distortion

side

surfaces of the armature

the commutator.

If

it is above the

it.

Unit

:

mm

COMMUTATOR

Q

0

I

Armature Commutator

e) Check the Surface of the Commutator.

If

the commutator surface

please

it smooth.

use

No,

I

Standard (New)

I

0.05

I

0.05

500-600

1

Limit

(Max.) (Max.)

[

0.1-

1

OK

is

rough, then

sandpaper to make

(Max7

(Max.)

(Used)

1

I

Fig.

89

f>

Check the Depth from If the commutator segments limit, then please repair it down.

the

Commutator Surface.

the depth

Standard (New)

0.5-0.8

of

the insulating material

the Insulating Material

from

is

less than the

by

filing it

Unit : mm

Limit

(Used)

0.2

(Min.)

A

Fig.

INSULATOR

?n+

CORRECT

1R-T

INCORRECT

Fig.

90

0.5-0.8

91

mrn

COMMUTATOR

SEGMENTS

-

57

-

(2)

BRUSH

Measure the length of the brushes and if they are under the

Brush

limit,

replace them.

Unit

:

mm

Positive

Negative

(3)

BRUSH

side

brush

side

HOLDER

brush

a> Insulation Test for the Brush Holder.

Check for continuity between the brush holder's top (Positive side) and its base

(Negative side). If there then Continuity

it

is

still good.

Exists : (Unsatisfactory

is

Insulation)

Replace

the brush hold-

er.

no continuity

Fig.

92

b) Inspection

of

the Brush Springs.

Check the weight of the brush springs.

Fig.

93

I

Fig.

94

-

58

-

(4)

PINION

Inspection

CLUTCH

of

the pinion clutch.

Rotate the pinion manually. While rotating

it

in the direction of normal operation, smoothly reverse the direction to

confirm that

In

the event

of

it

locks.

any

irregularity, replace

of

rotation

it.

Fig.

95

9-2-3

Reassembly

(1)

REASSEMBLY

is

in the revrse order The Places to The sliding surfaces

Apply

of

disassembly, however please note the following points.

Grease

of

:

the pinion and the shaft’s spline.

The metals holding the shaft at the front and rear covers.

-

59

-

10.

TROU8LESHOOTtNG

The following three conditionts must be fulflled for satisfactory engine start.

1.

The cylinder filled with a proper fuel- air mixture.

2.

Good compression in the cylinder.

3.

Good

spark, properly timed, to ignite the mixture. The engine cannot be started unless these three conditions are met. There are also other factors which make engine

start

at low speed, and a high back pressure due to a long exhaust The most common causes

10-

1

STARTING

10-1

-

1

FUEL SYSTEM

(1)

No

gasoline in the fuel tank

(2)

The carburetor is not choked sufficiently especially when the engine is cold.

(3)

Water, dust or

(4)

Inferior grade gasoline or poor quality gasoline not vaporized enough to produce the correct fuel

-

air mixture.

(5)

The carburetor needle valve is heldopen by dirt

DIFFICULTIES

gum

difficult, e.

8..

a

heavy load on the engine when it is about to start

pipe.

of

engine troubles are given below

;

or the fuel cock closed.

:

in the gasoline iterfering the fuel flow to the carburetor.

or

gum.

This

trouble can be detected as

the fuel flows out of the carburetor when the engine is idling.(Overflow)

This trouble may be remedied by lightly tapping the float chamber with the grip of

screwdriver If

(6)

the carburetor overflows, excessive fuel runs into the cylinder when starting the engine, making the fuel-air mixture too turn the starting pulley a few turns in order to let the rich fuel-air mixture out plug hole into the atmosphere. Keep the choke valve open during this operation. plug well, screw it into place, and try to

or

the like.

rich

to burn. If this happens, remove the spark plug, and

start

again.

of

Dry

the spark the spark

a

10-

1

-

2

COMPRESSION SYSTEM

If

starting difficultes and loss of power are not due to the fuel system or ignition system, the

followings must be checked

is

(1) Engine inside

(2)

Loose or broken spark plug. This causes a hissing noise made by mixture

completely dried

for

possible lack

up

of

because

compression.

of

a Iong period

of

storage.

gas

of cylinder in compression stroke during cranking.

(3)

Damaged head gasket

or

loose cylinder head.

A

similar hissing noise is produced during

compression stroke.

(4)

-Incorrect Valve clearance

If

the correct compression is not obtained even after remedying the above, disassemble the

engine and check further as follows a) Valve stuck open due to carbon

If

b)

the piston rings are stuck

the engine. Clean

or

replace the parts.

:

or

gum

on

the piston, remove the piston and connecting rod from

on

the valve stem.

running out

-

60

-

10-

1

-

3

IGNITION

SYSTEM

Check the followings for lack of sparks.

(1)

Wires of the ignition coil, spark plug or contact breaker disconnected.

(2)

Ignition coil damaged and shorted.

(3)

Spark

(4)

Spark plug dirty or wet.

(5)

Spark plug electrode gap incorrect.

(6)

Spark plug electrodes are connected

(7)

Incorrect spark timing.

plug

cable wet or soaked with oil.

or

bridged.

10- 2 ENGINGE MISFIRES

(1)

Incorrect spark plug electrodge gap. Adjust it to anywhere between

(2)

Ignition cable worn and leaking.

(3)

Sparks weak.

(4)

Ignition

(5)

Water in gasoline.

(6)

Insufficient compression.

wire

connections loose.

0.7

and

0.8mm.

10-3

(1)

(2)

(3)

ENGINE

STOPS

Fuel tank empty. Water, dirt, gum, etc. in gasoline. Vapor lock, i. e., gasoline evaporating in the fuel lines due to overheat around the engine.

Vapor lock in the fuel lines

or

carburetor due to the use of too volatile winter gas in the

hot season.

(4)

Air vent hole in the fuel tank cap plugged.

(5)

Bearing parts seized due to lack of

(6)

Magneto

or

ignition coil faulty.

oil.

10- 4 ENGINE OVERHEATS

(1)

Crankcase oil level low. Add oil immediately.

(2)

Spark

(3)

Low grade gasoline

(4)

Cooling air circulation restricted.

(5)

Cooling

(6)

Cylinder head cooling fins clogged

(7)

Engine operated in an enclosed space without sufficient cooling air.

(8)

Exhaust gas discharge restricted, or carbon deposits in the combustion chamber.

(9)

Engine running

timing incorrect.

air

path misdirected causes loss of cooling efficiency.

on

is

used,

or

engine is overloaded.

up

with dirt.

low-octane gaoline detonates due to heavy load at

low

speed.

-

61

-

10-5

(i)

(2)

(3)

(4)

(5)

(6)

(7,)

ENGINE KNOCKS

Poor quality gasoline. Engine operating under Carbon or lead Spark

Loose

Cuases

timing

connecting rod bearing due piston

of

engine

deposits

incorrect.

due

overheat.

to

heavy

in

wear.

load

the cylinder head.

at

low speed.

to

wear.

10- 6 ENGINE BACKFIRES THROUGH CARBURETOR

(1)

Water

(2)

Intake valve stuck.

(3)

Valves

(4)

Engine

or

dirt

in

overheated,

cold.

gasoline, or low- grade gasoline.

or

hot carbon particles

in

the

combustion chamber.

-

62

-

11.

Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all depend carefully for installing the engine.

11

When mounting the engine, carefully examine its position, the method of connecting it to a machine, the foundation, When determining its mounting position, in particular, make sure that gasoline and oil can easily

be

and that the oil can easily be discharged.

11

INSTALLATION

on

the way

-

1

INSTALLING

and

the mehtod

supplied and checked, the spark plug can easily

-

2

VENTILATION

in

which the engine is installed. Review

of

supporting the engine.

the

following instructions

be

checked, the air cleaner can easily be serviced,

Fresh

In

room

shorter engine life, etc., making it impossible to operate the engine properly. It is necessary, therefore, to provide a duct

of

Keep the engine room temperature below 50°C even in the hottest period

11

Exhaust outdoors. If

loss of engine power. Thus pipe inside diameter must be increased in proportion to exhaust pipe

length.

11

Take the following notes into consideration.

*

* *

*

* *

If

air

is necessary for cooling the engine and burning the fuel.

the case the engine is operated under a hood

can

cause vapor lock, oil deterioration, increased oil consumption, loss

or

baffle to guide cooling air to the engine

he hot air used for engine cooling, and temperature rise of the machine.

-

3

EXHAUST

gas

is

a

Exhaust pipe :Less than

-4

POWER

-4-

1

BELT

V-

belts are preferable to flat belts. The driving shaft of the engine The driving pulley of the engine must be in line with the driven pulley Install the engine pulley as close to the engine as possible. If possible, span the belt horizontally. Disengage the load when starting the engine.

no clutch

is

GAS

noxious. When operating the engine indoors, be sure to discharge

long exhaust pipe

Less than 5m long, pipe inside diameter 33mm.

TRANSMISSION TO

DRIVE

used, use a belt tension pulley

DISCHARGE

is

used in such a case, the internal resistance increases causing

3m

long, pipe inside diameter

must

DRIVEN

be parallel to the driven shaft of the machine.

or

in a small

MACHINES

or

the like.

room,

30mm,

temperature rise in the engine

of

to

power, piston seizure,

prevent recirculation

of

the year.

the

exhaust gas

of

the machine.

11

-4-2

When using a flexible coupling, runout and misalignment between the driven shaft and engine shaft must be minimized. Runout and misalignment tolerance are specified manufacturer.

FLEXfBLE

COUPLING

-

63

-

by

the coupling

12.

SERVICE

DATA

12- 1 CLEARANCE DATA AND

ITEM

CYLINDER

Flatness

Valve

Valve guide inside dia.

HEAD

seat contact

width

LIMITS

IN.

EX.

T

i

~EH%/EH34

0.05

(0.002)

0.7-1

.O

(0.028-0.039)

Unit

Limit

0.1

(0.004)

2.0

(0.079)

:

mm

(in)

6.600-6.622

(0.260-0.261

1

6.75

(0.266)

-

64

-

Unit : mm

(in)

CYLlNDER

0

Inside dia.

Roundiness after reboring.

STD

I

1

st

reboring

2nd

reboring

I I

STD

78.000-78.01 9 (3.071 "3.072)

78.250-78.269 (3.081 -3.082)

78.500-78.51 9 (3.091

-3.092)

0.0

1

(0.004)

EH30

To

when the difference between max.

and

diameter reached to

(0.004).

Lmit

be

rebored

min. of

Ditto

I

84.000-84.022 (3.307-3.308)

0.1

84.250-84.272 (3.31 7-3.31 8)

84.500-84.522 (3.327-3.328)

SBD

0.01

(0.004)

EH34

Lmit

To

be rebored when difference between

and

min. of diameter reached

(0.004).

to

Ditto

the

max.

0.1

8

Cylindricity after reboring.

PISTON

Q

Piston size (At skirt direction)

in

thrust

STD

st

O''

77.96-77.98

(3.069-3.070)

78.21 -78.23

(3.079-3.080)

I

2nd

o/s

78.46-78.48

(3.089-3.090)

0.01

5

(0.0006)

0.0 1 5

(0.0006)

77.87

(3.066)

78.1

2

(3.076) (3.31 5-3.31

78.37

(3.085)

83.96-83.98

(3.305-3.306)

84.21 -84.23

84.46-84.48

(3.325-3.326)

6)

83.87

(3.302)

84.1

2

(3.31

2)

84.37

(3.322)

-

65

-

Unit

:

mm

(in)

ITEM

Ring groove side clearance

Piston

Pistcm

hole

outsldn

dta.

Oil

TO

2nd

ring

D

(0.002-0.0035)

'0.001

:0.0004--0.0026:

20.995-21.008

'0.8266-0.8271:

STD

0.05-0.09

0.03-0.07 2-0.0028:

0.01

-0.065

EH30

Limit

0.1 5

(0.006)

0.1

5

(0.006)

0.1

5

(0.006)

2

1.035

(0.8281

STD

0.05-0.09

(0.002-0.0035)

0.93-0.07

0.001

2-0.0028>

-0.065

0.01

0.0004-0.0026:

20.995-21.008

0.8266-0.8271

EH34

Limit

0.1 5

(0.006)

0.1

5

(0.006)

0.1

5

(0.006)

2

1.035

(0.828

1

Clearance

cylinder

between piston

at

skirt

area.

and

20.99

1

"21

.OOO

:0.8264--0.8268:

0.025--@.@64

:0.001

G-".0025

0.2-0.4

(0.0079-0.01

57

-

i

-1-

20.960

(0.8251

20.991 -21

0.8264-0.8268;

)

:0.0010-0.0026:

.OOO

U.rJ25."-,0.067

20.960

(0.825

1

0.25

(0.0098)

1.5

io.0091

_. .

_. . .

)

"

0.1

-4.3

-

66

I

,/

'I

i

-

1.5

(0.0591

STD

Unit

Limit

:

mm

(in)

1

CONNECTING

Big

end inside dia.

Clearance between big end and crankpin

Small end inside dia.

Clearance between small end and piston

ROD

38.000-38.01

(

1

-496

1

-

1

-4967)

0.030-0.060

(0.00

1

2-0.0024)

21.010-21.023

(0.8272-0.8277)

0.01

0-0.032

(0.0004-0.001

6

3)

0.2

21.080

0.1

2

(0.0079)

(0.8299)

(0.0047)

Big end side clearance

CRANKSHAFT

I

Clealance between

journal

and main bearing

0.1

-0.3

(0.0039-0.01

I

18)

37.956-37.970

(1

-4943- 1.4949)

1

.O

(0.0394)

37.85

(1.4902)

34.986-34.997

(1.3774- 1.3778)

I1

-

0.009-0.01 4

.

..:

.

,

..

.

(-

0.00035-0.00055)

-

67

-

Unit

:

mm

(in)

I

CAMSHAFT

0

Cam height

ITEM

IN.EX.

cams

T

STD

36.1 "36.3

(1.4213-1.4291)

19.967- 19.980

(0.7861 -0.7866)

EH30/EH34

Limit

35.95 (1.41 54)

19.950 (0.7854)

VALVE

*

Valve stem

Clearance between valve

outside

guide

dia.

valve

~

stem

..

-.

dia. and

IN.

EX.

IN.

EX.

6.535-6.550

(0.2573-0.2579)

6.522-6.544

(0.2568-0.2576)

0.050-0.087

(0.0022-0.0034)

0.056-0.1

(0.0022-0.0039)

00

6.450 (0.2539)

0.30

(0.01 1 8)

0.30 (0.01

1

8)

IN./EX.

(cold)

0.085-0.1

(0.0034-0.0045)

15

Unit : mm

(in)

TAPPET

0

Stem outside dia.

Guide

0

Tappet guide clearance

inside

dia.

ITEM

r

STD

8.960-8.975

(0.3528-0.3533)

9.00-9.01

(0.3543-0.3549)

0.025-0.055

(0,001 0-0.0022)

5

EH30/EH34

Limit

8.93 (0.351 6)

9.08

(0.3575)

0.1

5

(0.0059)

1

ROCKER

Rocker arm hole dia.

Rocker arm shaft clearance

VALVE

ARM

SPRING

FREE

LENGTH

1

1.986-1 1.994

(0.471 9-0.4722)

1

2.006-

(0.4727-0.4734)

0.01

(0.0005-0.001 5)

1

2.024

2-0.038

1

1.92 (0.4693)

12.07

(0.4752)

0.1 5 (0.0059)

39.5

(1.5551

-

69

-

)

Unit : mm

(in)

VALVE

0

Valve

0

Valve contact

SEAT ANGLE

cutter

angle

width

12- 2 TORQUE

DESCRIPTION

Cylinder head bolts

ITEM

(IN.

EX.)

(a)

(b)

SPECIFICATIONS

~

~~ ~~

kg

cm

340-420

STD

a

:

90"

b

:

0.7-1.0

(0.028-0.039)

~~~

TIGHTENING

I

EH30/EH34

TORQUE

N

m

2.0

(0.079)

I

Limit

ft

24.6-30.4 33.3-4 1.2

Ib

Connecting

rod

cap

bolts

Flywheel nut

~ ~~~ ~ ~~~~ ~~

Main bearing

Spark

plug

cover

New

bolts

spark

Retightening

plug

225-275 850-950

170-

190

120-150

230-270

22.1

-27.0

16.7-18.6

1

1.8- 14.7

22.6-126.5

16.3-

19.9

61.5-68.7 83.4-93.2

12.3-13.7

8.7-

10.9

16.6- 19.5

-

70

-

12-3

OIL

GRADE

CHART

Specified

Lubricant

aualitv

Multi-

Use

oil classified

Multi-grade

Single

grade

oil

Comparison

-

20

-4

as

SC

or

higher.

tends to increase

between

-

10

14

its

consumption at high ambient temperature.

0

32

oil

viscosity

10

50

and

temparature

20

68

30

86

t

4oT

104°F

-

7t

-

13.

MAINTENANCE AND STORAGE

The following maintenance conditions. The indicated maintenance intervals are by no means guarantees operations during these intervals. For example, if the engine is operated in extremely dusty conditions, the air cleaner should be cleaned every day instead of every

13-

1

DAILY MAINTENANCE

MAINTENANCE

1)

Clean away dust and chaff from engine.

2)

Check fuel leakage from fuel

If

system. or replace necessary parts.

3)

Inspect retighten

4)

Check oil level and add to full mark.

any, retighten fasteners

for

loose

if

necessary.

jobs

hardwares and

apply when the engine is operated correctly under normal

for

50

hours.

REMARKS

Governor linkage is especially sensitive

Loose breakage

bolts

of

and nuts may come

other parts.

off

maintenance free

to

dust.

and result

in

13-2

13-3

I

INITIAL

MAINTENANCE

1)

Change crankcase

EVERY

1)

Change crankcase oil.

2)

Clean air cleaner.

3)

Check and clean spark

50

MAINTENANCE REMARKS

20

HRS. MAINTENANCE

oil.

HRS.

(10

plug.

DAYS) MAINTENANCE

REMARKS

To remove sludge from

Contaminated oil quickens wear.

If

dirty,

wash

in

gasoline

run-

or

in operation.

polish

with

emery

paper.

-

72

-

13-4

EVERY 1 OQ"280

HRS.

(MONTHLY)

MAINTENANCE

~~~ ~

1)

Clean fuel filter

2)

Inspect cooling system and remove dirt and chaff.

43-5

I

13- 6 EVERY

EVERY

head.

2)

Disassemble and clean carburetor

500-600

MAINTENANCE REMARKS

1000

and

WRS.

fuel tank.

HRS.

MAINTENANCE

(YEARLY)

REMARKS

Remove blower housing and clean up between fins and housing.

I

power.

MAINTENANCE

I

1)

Overhaul engine. Clean and correct parts.

I

2)

Replace fuel

I

(1)

Perform the above

(2)

Drain fuel from the fuel tank and carburetor float chamber.

(3)

To

crankshaft several turns

(4)

Turn the starting pulley

(5)

Clean outside of the engine with oiled cloth.

(6)

Put a plastic cover or the like

MAINTENANCE

Replace piston rings and other necessary parts.

lines

prevent rust in the cylinder bore, apply oil through the

once a year.

13-

1

and

by

I

Avoid hazards caused by fuel leakage.

13

-

2

maintenance

hand. Reinstall the plug.

hand and leave

over

the engine and store the engine in dry place.

it

REMARKS

jobs.

spark

where the resistance is the heaviest.

plug

hole and turn the

-

73

-

Industrial

Engines

Subaru Robin Power Products HD7830, HD7832 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual