Robin EH12-2 Service Manual

SERVICE
MANUAL

Models

EH09,
EH12-2 Rammer
ENGINES

PUB-ES1330
Rev. 12/01

940 Lively Blvd. • Wood Dale, IL 60191 • Phone: [phone] • Fax: [phone]

e-mail: [e-mail] • www.robinamerica.com

© Copyright 2001 Robin America, Inc.

CONTENTS

Section Title Page

1. SPECIFICATIONS....................................................................................................... 1

2. PERFORMANCE ........................................................................................................3

2-1 MAXIMUM OUTPUT........................................................................................................ 3

2-2 CONTINUOUS RATED OUTPUT .................................................................................... 3

2-3 MAXIMUM TORQUE ....................................................................................................... 3

2-4 PERFORMANCE CURVES ............................................................................................. 4

3. FEATURES..................................................................................................................6

4. GENERAL DESCRIPTION OF ENGINE COMPONENTS .......................................... 7

4-1 CYLINDER AND CRANKCASE....................................................................................... 7

4-2 MAIN BEARING COVER ................................................................................................. 7

4-3 CRANKSHAFT.................................................................................................................7

4-4 CONNECTING ROD AND PISTON ................................................................................. 8

4-5 PISTON RINGS ...............................................................................................................8

4-6 CAMSHAFT ..................................................................................................................... 8

4-7 VALVE ARRANGEMENT ................................................................................................. 9

4-8 CYLINDER HEAD............................................................................................................ 9

4-9 GOVERNOR SYSTEM .................................................................................................... 9

4-10 COOLING SYSTEM..................................................................................................... 10

4-11 LUBRICATION SYSTEM.............................................................................................. 10

4-12 IGNITION SYSTEM ..................................................................................................... 10

4-13 CARBURETOR............................................................................................................ 10

4-14 AIR CLEANER ..............................................................................................................11

4-15 DECOMPRESSION SYSTEM ......................................................................................11

4-16 SECTIONAL VIEW OF ENGINE.................................................................................. 12

5. DISASSEMBLY AND REASSEMBLY ....................................................................... 16

5-1 PREPARATIONS AND SUGGESTIONS........................................................................ 16

5-2 SPECIAL TOOLS (EH12-2D)......................................................................................... 16

5-3 DISASSEMBLY PROCEDURES.................................................................................... 17

5-4 REASSEMBLY PROCEDURES..................................................................................... 30

5-5 BREAK-IN OPERATION ................................................................................................ 46

6. MAGNETO ................................................................................................................ 46

6-1 OPERATION AND FUNCTION ...................................................................................... 46

6-2 BASIC THEORY ............................................................................................................ 46

6-3 WIRING DIAGRAM....................................................................................................... 48

7. AUTOMATIC DECOMPRESSION SYSTEM............................................................. 49

8a. FLOAT TYPE CARBURETOR (EH09D) ................................................................. 50

8a-1 OPERATION AND CONSTRUCTION.......................................................................... 50

8a-2 DISASSEMBLY AND REASSEMBLY........................................................................... 51

Section Title Page

8b. FLOAT TYPE CARBURETOR (EH12-2D)............................................................. 53

8b-1 OPERATION AND CONSTRUCTION..........................................................................53

8b-2 DISASSEMBLY AND REASSEMBLY...........................................................................54

8c. DIAPHRAGM TYPE CARBURETOR (OPTION) ................................................... 56

8c-1 OPERATION AND CONSTRUCTION..........................................................................56

8c-2 DISASSEMBLY PROCEDURE ....................................................................................59

8c-3 INSPECTION PROCEDURE ......................................................................................59

8c-4 REASSEMBLY PROCEDURE .....................................................................................60

8c-5 DIAPHRAGM CARBURETOR ADJUSTMENT METHOD............................................61

9. STARTING SYSTEM.................................................................................................62

9-1 RECOIL STARTER ........................................................................................................62

10. TROUBLESHOOTING ........................................................................................... 66

10-1 STARTING DIFFICULTIES ..........................................................................................66

10-2 ENGINE MISFIRE........................................................................................................67

10-3 ENGINE STOPS ..........................................................................................................67

10-4 ENGINE OVERHEAT...................................................................................................68

10-5 ENGINE KNOCKS .......................................................................................................68

10-6 ENGINE BACKFIRES THROUGH CARBURETOR.....................................................68

11. INSTALLATION ..................................................................................................... 69

11-1 INSTALLING................................................................................................................. 69

11-2 VENTILATION ..............................................................................................................69

11-3 EXHAUST GAS DISCHARGE .....................................................................................69

11-4 POWER TRANSMISSION TO DRIVEN MACHINES...................................................69

12. SERVICE DATA...................................................................................................... 70

12-1 CLEARANCE DATA AND LIMITS ................................................................................70

12-2 TORQUE SPECIFICATIONS .......................................................................................76

12-3 OIL GRADE CHART ....................................................................................................76

13. MAINTENANCE AND STORAGE.......................................................................... 77

13-1 DAILY MAINTENANCE................................................................................................77

13-2 INITIAL 20 HRS. MAINTENANCE ...............................................................................77

13-3 EVERY 50 HRS. (10 DAYS) MAINTENANCE .............................................................77

13-4 EVERY 100-200 HRS. (MONTHLY) MAINTENANCE .................................................78

13-5 EVERY 300 HRS. or YEARLY MAINTENANCE ..........................................................78

13-6 EVERY 500-600 HRS. MAINTENANCE......................................................................78

13-7 EVERY 1000 HRS. (YEARLY) MAINTENANCE ..........................................................78

13-8 ENGINE STORAGE.....................................................................................................78

1. SPECIFICATIONS

LEDOMD90HE

epyT

ekortSxeroB ).ni56.1x10.2(mm24x15

tnemecalpsiDnotsiPmc68

oitaRnoisserpmoC 5.9

suounitnoC.m.p.r0063/)PH9.1(Wk4.1

tuptuO

.xaM.m.p.r0063/)PH4.2(Wk8.1

euqroT.xaMN8.4

noitatoRfonoitceriD ediStfahS.O.T.PmorFdeweiVsAesiwkcolcretnuoC

metsysgnilooC gnilooCriAdecroF

tnemegnarrAevlaV evlaVdaehrevO

noitacirbuL epyThsalpS

tnacirbuL rehgihroESssalC;03-W01ro03#,02#EASliOelibomotuA

tnacirbuLfoyticapaC ).lag.S.U970.0(sretil3.0

roterubraC mgarhpaiDroepyTtaolF,tfarDlatnoziroH

,rednilyC-elgniS,elcyC-4,delooC-riA

enignEenilosaGVHO,tfahS.O.T.PlatnoziroH

3

・

fgk94.0(m

・

).ni.uc42.5(

.m.p.r0023/)m

leuF enilosaGdedaelnUelibomotuA

oitaRnoitpmusnoCleuFWk/g013

metsySdeeFleuF epyTytivarG

metsySnoitingI )etatSdiloS(otengaMleehwylF

gulPkrapS A6RMB,A6MBKGN

metsySgnitratS retratSlioceR

metsySronrevoG epyTthgiewylFlagufirtneC

renaelCriA epyTtnemelElauD

thgieWyrD ).bl7.02(gk4.9

)HxWxL(snoisnemiD ).ni0.31x.ni6.11x.ni1.9(mm033xmm592xmm232

Specifications are subject to change without notice.

・

PH/g032(h

・

tuptuOdetaRsuounitnoCtA)h

- 1 -

LEDOMD2-21HE

epyT

ekortSxeroB ).ni96.1x63.2(mm34x06

tnemecalpsiDnotsiPmc121

oitaRnoisserpmoC 0.9

suounitnoC.m.p.r0063/)PH8.2(Wk1.2

tuptuO

.xaM.m.p.r0063/)PH5.3(Wk6.2

euqroT.xaMN5.7

noitatoRfonoitceriD ediStfahS.O.T.PmorFdeweiVsAesiwkcolcretnuoC

metsysgnilooC gnilooCriAdecroF

tnemegnarrAevlaV evlaVdaehrevO

noitacirbuL epyThsalpS

tnacirbuL rehgihroESssalC;03-W01ro03#,02#EASliOelibomotuA

tnacirbuLfoyticapaC ).lag.S.U11.0(sretil4.0

roterubraC mgarhpaiDroepyTtaolF,tfarDlatnoziroH

,rednilyC-elgniS,elcyC-4,delooC-riA

enignEenilosaGVHO,tfahS.O.T.PlatnoziroH

3

・

fgk67.0(m

・

).ni.uc93.7(

.m.p.r0062/)m

leuF enilosaGdedaelnUelibomotuA

oitaRnoitpmusnoCleuFWk/g013

metsySdeeFleuF epyTytivarG

metsySnoitingI )etatSdiloS(otengaMleehwylF

gulPkrapS SE6RB,SE6BKGN

metsySgnitratS retratSlioceR

metsySronrevoG epyTthgiewylFlagufirtneC
renaelCriA epyTtnemelElauD
thgieWyrD ).bl1.53(gk9.51

)HxWxL(snoisnemiD ).ni1.31x.ni0.31x.ni3.11(mm433xmm033xmm682

Specifications are subject to change without notice.

・

PH/g032(h

・

tuptuOdetaRsuounitnoCtA)h

- 2 -

2. PERFORMANCE

2-1 MAXIMUM OUTPUT

The maximum output is the output of an engine with its throttle valve fully opened and considering that all
the moving parts are properly broken in.

A new engine may not produce full maximum output while its moving parts are still not broken-in.

NOTE :
Power curves shown in the following charts are made in conformity with SAE internal combustion engine
standard test code J1349.

2-2 CONTINUOUS RATED OUTPUT

The continuous rated output is the output of an engine at optimum governed speed which is most favor­able from the view point of engine's life and fuel consumption.

When the engine is installed on a certain equipment, it is recommended that the continuous output
required from the engine be kept below this continuous rated output.

2-3 MAXIMUM TORQUE

The maximum torque is the torque at the output shaft when the engine is producing maximum output at
a specified r.p.m..

- 3 -

2-4 PERFORMANCE CURVES

EH09D

MAXIMUM TORQUE

N・m kgf・m

6 0.6

0.5

5

HP kW

3

2

2

1

OUTPUT

1

MAXIMUM HORSEPOWER

CONTINUOUS

RATED HP

RECOMMENDED
HORSEPOWER
RANGE

0.4

4

TORQUE

0

0

2000

REVOLUTION

3000

4000

r.p.m.

- 4 -

EH12-2D

HP

kW

3

4

3

2

2

OUTPUT

1

MAXIMUM TORQUE

MAXIMUM HORSEPOWER

CONTINUOUS RATED HP

RECOMMENDED
HORSEPOWER
RANGE

N・m  kgf・m

8

0.8

7

0.7

6

0.6

TORQUE

1

0

2000 3000 4000

REVOLUTION      r.p.m.

- 5 -

3. FEATURES

1. The EH09D and EH12-2D engines are designed exclusively for rammers.
Optimum lubrication and better inclined operation are obtained thanks to upright cylinder design.

2. Easy operation
These engines, with its upright cylinder, reduce swinging moment and achieved easier operation for
rammers.
Because the direction of vibratory force caused by reciprocating parts, such as piston and connecting
rod, is the same as the jumping direction of the rammer itself. Furthermore, these engines are de­signed carefully to balance the weight on the rammer by locating the air cleaner and muffler symmetri­cally with the center line of the cylinder.

3. Improved durability
Vibration damping and durability are greatly improved by introducing a vibration-proof breather mecha­nism, thick sheet metal, reinforced casting parts with thick walls and ribs, and a carburetor that pre­vents fuel leakage when the engine is inclined.

4. Ideal engine performance for rammer
The overhead valve design offers ideal combustion characteristics.
More emphasis was placed on the continuous rated power of the engine than its maximum power,
considering operating characteristics when the engine is mounted on a rammer.

5. Easy starting
Combining an ignition system with an advanced spark timing and mechanical compression release
improves start-ability. Equipped with a low-speed governor, it can be started without operating the
throttle.

6. Economical and clean engine
These engines achieved fuel-efficiency and cleanliness, reducing polluting exhaust emission remark­ably.

- 6 -

4. GENERAL DESCRIPTION OF ENGINE COMPONENTS

4-1 CYLINDER AND CRANKCASE

The cylinder and crankcase is a single piece alu­minum die-casting.

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
attached.

Fig. 4-1

4-2 MAIN BEARING COVER

The main bearing cover is an aluminum die-cast­ing with thick reinforcing walls and ribs, which is
mounted on the output shaft side of the crank­case.

OIL GAUGE

Remove the main bearing cover to inspect the in­side of the engine.

Pilots and bosses are machined on the cover for
direct mounting of the engine onto rammers.

4-3 CRANKSHAFT

The crankshaft is forged carbon steel, and the
crank pin is induction-hardened.

The output end of the shaft has a crankshaft gear
that is pressed into position.

Fig. 4-2

- 7 -

Fig. 4-3

4-4 CONNECTING ROD AND PISTON

The connecting rod is an aluminum alloy die-cast­ing and its large and small ends function as bear­ings.

The piston is an aluminum alloy casting, and car­ries two compression rings and one oil ring.

Model: EH09D

4-5 PISTON RINGS

The piston rings are made of special cast iron.
The profile of the top ring and the second ring are

shown in the illustration.
The oil ring is designed for better sealing and less

oil consumption.

①
②
③

1

2

3

TOP
RING

SECOND
RING

OIL
RING

EH09D
EH12-2D

EH09D

EH12-2D

EH09D

EH12-2D

Model: EH12-2D

Fig. 4-4

BARREL

TAPER

TAPER
UNDER CUT

CUTTER

CUTTER RING WITH
COIL EXPANDER

RING

4-6 CAMSHAFT

The camshaft is made of special cast iron, and
camshaft and gear are cast together in one piece.

Both sides of the shaft fit into the plain bearings
on the crankcase and main bearing cover.

Fig. 4-5

Fig. 4-6

- 8 -

4-7 VALVE ARRANGEMENT

The intake valve is located on the flywheel side of the cylinder head.
Hard alloy valve seats are molded in the cylinder head and satellite is fused to the exhaust valve face.
The cylinder baffle leads cooling air to the exhaust valve area for the optimum cooling.

IN

EX

IN

EX

INTAKE
VALVE

EXHAUST
VALVE

Model: EH09D

Fig. 4-7a

4-8 CYLINDER HEAD

The cylinder head is an aluminum die-casting
which utilizes wedge type combustion chamber
for the high combustion efficiency.

INTAKE
VALVE

EXHAUST
VALVE

Model: EH12-2D

Fig. 4-7b

Fig. 4-8

4-9 GOVERNOR SYSTEM

The governor is a centrifugal flyweight type which
ensures constant operation at the selected speed
during load variations.

The governor gear with governor weights is in­stalled on the main bearing cover.

GOVERNOR GEAR

Fig. 4-9

- 9 -

4-10 COOLING SYSTEM

The large fins on the flywheel provide sufficient
cooling air capacity for the inlet and exhaust area
and cylinder. The cylinder baffle directs the cool­ing air flow efficiently.

4-11 LUBRICATION SYSTEM

All the rotating and sliding parts are splash- lubri­cated by the oil splasher on the connecting rod.

OIL SPLASHER

Fig. 4-10

4-12 IGNITION SYSTEM

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

This system has an automatic ignition timing ad­vance system for easy starting.

4-13 CARBURETOR

The engine is equipped with a horizontal draft car­buretor that has a float controlled fuel system and
a fixed main jet.

The carburetors are calibrated carefully for sure
starting, good acceleration, less fuel consumption
and maximum output.

IGNITION COIL

FLYWHEEL

Fig. 4-11

For details, refer to page 50, section “8a FLOAT
CARBURETOR (EH09D)” or refer to page 53,
section “8b FLOAT CARBURETOR (EH12-2D)”.

As an optional part, diaphragm type is available.
For details, refer to page 56, section “8c DIA­PHRAGM CARBURETOR (OPTION)”.

-

10

FLOAT TYPE DIAPHRAGM TYPE

Fig. 4-12

-

4-14 AIR CLEANER

The air-cleaner is a heavy-duty type with a dual
element system ; the primary one is an urethane
foam (semi-wet) and secondary one is a semi wet
type element.

URETHANE FOAM

CLEANER
COVER

CLEANER BASE

ELEMENT

Model: EH09D

Fig. 4-13a

CLEANER BASE

ELEMENT

CLEANER
COVER

4-15 DECOMPRESSION SYSTEM

An automatic decompression mechanism which
opens the exhaust valve before the piston reaches
maximum compression is assembled on the cam­shaft for easy starting.

During engine operation the decompression sys­tem is overpowered by centrifugal force and com­pression is fully utilized to produce power.

PLATE,
AIR CLEANER

ELEMENT SET

Model: EH12-2D

Fig. 4-13b

AUTOMATIC DECOMPRESSION SYSTEM

RETURN SPRING

Fig. 4-14

-

11

-

4-16 SECTIONAL VIEW OF ENGINE

EH09D

INTAKE VALVE

EXHAUST VALVE

MUFFLER

PISTON

PISTON RING

CYLINDER HEAD

PISTON PIN

IGNITION COIL

BLOWER HOUSING

RECOIL STARTER

P.T.O. SHAFT

MAIN
BEARING
COVER

ADAPTER
(

FLANGE

)

FLYWHEEL

CRANKCASE

Fig. 4-15

-

12

-

ROCKER COVER

PUSH ROD

ROCKER ARM

SPARK PLUG

CONNECTING ROD

CARBURETOR

AIR CLEANER

TAPPET

CAMSHAFT

GOVERNOR LEVER

SPEED CONTROL

LEVER

OIL GAUGE

PLUG

Fig. 4-16

-

13

-

CRANKSHAFT

STIFFENER

EH12-2D

INTAKE VALVE

EXHAUST VALVE

PISTON

PISTON RING

P.T.O. SHAFT

CYLINDER HEAD

IGNITION COIL

BLOWER HOUSING

PISTON PIN

MAIN
BEARING
COVER

CRANKCASE

Fig. 4-17

-

14

-

RECOIL STARTER

FLYWHEEL

ROCKER COVER

PUSH ROD

ROCKER ARM

SPARK PLUG

MUFFLER

CONNECTING ROD

CARBURETOR

AIR CLEANER

TAPPET

GOVERNOR

LEVER

CAMSHAFT

OIL GAUGE

CRANKSHAFT

Fig. 4-18

-

15

-

SPEED CONTROL

LEVER

PLUG

5. DISASSEMBLY AND REASSEMBLY

5-1 PREPARATIONS AND SUGGESTIONS

1) When disassembling the engine, memorize the locations of individual parts so that they can be
reassembled correctly. If you are uncertain of identifying some parts, it is suggested that tags be
attached to them.

2) Have boxes ready to keep disassembled parts by group.

3) To prevent losing and misplacing, temporarily assemble each group of disassembled parts.

4) Carefully handle disassembled parts, and clean them with washing oil if necessary.

5) Use the correct tools in the correct way.

5-2 SPECIAL TOOLS (EH12-2D)

.oNlooTlooTesU

straptekraMrellupleehwylFleehwylfehtffognilluproF

FLYWHEEL PULLER

Fig. 5-1

-

16

-

5-3 DISASSEMBLY PROCEDURES

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

1niardlioenignE

.eguag

.lioniarddnagulpniardlioevomeR)1(

lioevomer,ylkciuqlioegrahcsidoT)2(

2

EH09D

EH09D

M8 NUT
: 4 pcs.

OIL LEVEL GAUGE

M8 WASHER
: 4 pcs.

reneffitSdnaretpadA

GASKET

.scp4:52x8M
.scp2:03x8M
,rehsaw,tun8M

:rehsawgnirps

scp4

STEP 1

OIL DRAIN
PLUG

GASKET

M8 SPRING
WASHER : 4 pcs.

ADAPTER

STEP 2

M8 x 30 BOLT AND
WASHER : 2 pcs.

STIFFENER

M8 x 25 BOLT AND
WASHER : 4 pcs.

-

17

-

Fig. 5-2

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

3retratslioceR

.scp3;21x6M

)D90HE(

.scp4;8x6M

)D2-21HE(

4gnisuohrewolB

EH09D

STEP 4

M6 x 8 FLANGE BOLT

BLOWER
GUIDE CP

M4 TAPPING SCREW : 2 pcs.

STOP SWITCH

CLAMP

: 1 pce.

M6 x 12 FLANGE

BOLT : 1 pce.

M6 x 12 FLANGE BOLT : 1 pce.

M6 x 12 FLANGE
BOLT : 2 pcs.

neht,tsrifhctiwspotsfoeriwtcennocsiD

.esacknarcmorfgnisuohrewolbevomer

M6 x 12 FLANGE
BOLT : 3 pcs.

STEP 3

RECOIL
STARTER

M6 x 12 FLANGE
BOLT: 1 pce.

.scp5;21x6M

)D90HE(

.scp2;8x6M

)D90HE(

.scp4;55x6M

)D2-21HE(

EH12-2D

STEP 4

CLAMP

M4 TAPPING
SCREW : 2 pcs.

STOP
SWITCH

M6 x 8 FLANGE
BOLT: 1 pce.

BLOWER HOUSING CP

M6 x 8 FLANGE BOLT
: 4 pcs.

STEP 3

RECOIL
STARTER

M6 x 55 FLANGE BOLT
: 4 pcs.

BLOWER HOUSING CP

Fig. 5-3

-

18

-

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

5

EH09D

EH09D

EH12-2D

MUFFLER CP

elffabrednilyc

revocdaeh

dnatekcarbrelffum,relffuM

dnatekcarbrelffum,relffuM

M6 x 12 BOLT AND
WASHER AY : 2 pcs.

MUFFLER
BRACKET CP

.gulpkraps

M6 FLANGE NUT : 2 pcs.

.teksagrelffumesolottonluferaceB

morftsrifpacgulpkrapsevomeR

.teksagrelffumesolottonluferaceB

BLOWER HOUSING
BRACKET CP 2

CYLINDER BAFFLE

;tunkcolfles6M

.scp2

.scp2;21x6M

;tunegnalf6M

.scp2

;tunkcolfles8M

.scp2

.scp4;61x8M

2;rehsaw8M

.scp

.scp2;81x6M

EH12-2D

M6 SELF LOCK
NUT : 2 pcs.

M8 x 16 BOLT AND
WASHER AY : 2 pcs.

MUFFLER

M8 SELF LOCK
NUT : 2 pcs.

M8 x 16 BOLT AND
WASHER AY : 2 pcs.

Do not touch
the flange bolts.

GASKET
(

MUFFLER

STEP 5

GASKET
(

MUFFLER

)

)

STEP 5

SPACER
(

EXHAUST

)

MUFFLER BRACKET

M8 WASHER : 2 pcs.

M6 x 18 FLANGE
BOLT : 2 pcs.

HEAD COVER

-

19

-

Fig. 5-4

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

.revocrekcormorfepiprehtaerbevomeR.scp2;tun6M

6renaelcriA

.ecp1;81x8M

)D2-21HE(

EH09D

PURSE LOCK

BREATHER PIPE

STEP 6

CLEANER BASE

URETHANE FOAM

ELEMENT

CLEANER COVER

M6 SELF LOCK NUT : 2 pcs.

EH12-2D

BREATHER PIPE

CLAMP

WASHER

BOTTOM PLATE

PLATE(AIR CLEANER

M6 NUT : 2 pcs.

M8 x 18 BOLT AND
SPRING WASHER AY : 1 pce.

Fig. 5-5

-

20

-

)

ELEMENT

ELEMENT SET

CLEANER COVER

STEP 6

EH09D

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

7revelronrevoG

8roterubraC

9

ronrevogevomerdnatlobehtnesooL)1(

.ecp1;52x6M

.revel

ronrevogmorfgnirpsronrevogkoohnU)2(

.revel

ronrevogehthcihwnoelohehtkraM

.dekoohsignirps

gnikoohnuylluferacroterubracevomeR

ronrevogmorfgnirpsdordnadorronrevog

.revel

;tlobtovip6M

dnarevellortnocdeepS

etalpesab

.ecp1

egnalf8x6M

.scp2;tlob

M6 x 8 FLANGE
BOLT : 2 pcs.

SPACER

SPEED CONTROL
LEVER AY

STEP 9

BASE
PLATE CP

M6 BOLT AND
WASHER AY : 1 pce.

RETURN
SPRING

ROD SPRING

GOVERNOR LEVER

FRICTION WASHER

INSULATOR

GOVERNOR ROD

GOVERNOR SPRING

M6 PIVOT BOLT

: 1 pce.

GASKET (INSULATOR

CARBURETOR

STEP 8

STEP 7

)

Fig. 5-6

-

21

-

EH12-2D

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

7revelronrevoG

8

9

epip

GASKET

.rotcetorpehtevomeR)1(

.ecp1;61x8M

.ecp1;41x6M

ronrevogevomerdnatlobehtnesooL)2(

.ecp1;03x6M

.revel

ronrevogmorfgnirpsronrevogkoohnU)3(

.revel

ronrevogehthcihwnoelohehtkraM

.dekoohsignirps

ekatnidnaroterubraC

ronrevogmorfgnirpsdordnadorronrevog

gnikoohnuylluferacroterubracevomeR

.scp2;tun6M

.ecp1;04x6M

.revel

;tlobtovip6M

dnarevellortnocdeepS

tekcarberiw

.ecp1

egnalf41x6M

.scp1;tlob

M6 NUT : 2 pcs.

M6 x 40 BOLT AND
WASHER : 1 pce.

STEP 8

INTAKE
PIPE

INSULATOR

CARBURETOR

STEP 9

WIRE BRACKET

ROD SPRING

GOVERNOR

LEVER

STEP 7

M6 BOLT AND
WASHER AY : 1 pce.

M6 x14 FLANGE BOLT : 1 pce.

Fig. 5-7

-

GOVERNOR
ROD

GOVERNOR
SPRING

NUT

22

-

GASKET
(

INSULATOR

M6 PIVOT BOLT : 1 pce.

)

STEP 9

SPEED CONTROL LEVER

M6 x 12 FLANGE
BOLT : 1 pce.

PROTECTOR

M8 x 16 BOLT AND
WASHER AY : 1 pce.

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

01liocnoitingI

11leehwylF

21gulpkrapS

EH09D

)2(

EH12-2D

.gulpkrapsmorfpacgulpkrapsevomeR)1(

.esacknarcmorfliocnoitingievomeR)2(

.leehwylfmorfyellupretratsehtevomeR)1(

tungninetsafleehwylfnohcnerwtekcosecalP

eeS(.remmahhtiwrevelehtfopitekirtsdna

).9-5.giF

gnisutfahsknarcfodneleehwylfnopaT

.leehwylfevomerotrabmunimula

).01-5.giFeeS(

.rellupleehwylfehtgnisuleehwylfevomeR

).11-5.giFeeS(

.tfahsknarcmorfyekehtevomeR)3().21-5.giFeeS(

)D90HE(A6RMB,A6MB:KGN

)D2-21HE(SE6RB,SE6B:KGN

rehsaw

rehsaw

.scp2;52x6M

gnirps,tun21M

gnirps,tun41M

ALUMINUM BAR

Fig. 5-9 Fig. 5-10 Fig. 5-11

SPARK PLUG CAP

SPARK
PLUG

STEP 12

IGNITION COIL CP

STEP 10

M6 x 25 BOLT AND
WASHER AY
: 2 pcs.

FLYWHEEL CP

M12 SPRING WASHER : 1 pce. (EH09D)
M14 SPRING WASHER : 1 pce. (EH12-2D)

STARTING

PULLEY

M12 NUT : 1 pce. (EH09D)
M14 NUT : 1 pce. (EH12-2D)

STEP 11

WOODRUFF KEY

Fig. 5-8

-

23

Fig. 5-12

-

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

31revocrekcoR

41daehrednilyC

.daehrednilyc

.esacknarc

EH09D EH12-2D

M6 x 60 BOLT AND
WASHER AY : 4 pcs.

M8 x 55 FLANGE
BOLT : 4 pcs.

STEP 13 STEP 13

ROCKER COVER

M6 x 40 FLANGE
BOLT : 4 pcs.

morfteksagdnarevocrekcorevomeR

.scp4;06x6M

)D90HE(

.scp4;04x6M

)D2-21HE(

morfteksagdnadaehrednilycevomeR)1(

.scp4;55x8M

)D90HE(

.rednilycmorfsdorhsupevomeR)2(

.scp4;56x8M

)D2-21HE(

ROCKER COVER

GASKET

CYLINDER
HEAD CP

STEP 14

GASKET

GASKET

PUSH ROD

M8 x 65 FLANGE
BOLT : 4 pcs.

CYLINDER
HEAD CP

Fig. 5-13

GASKET

SPACER
(

BREATHER

GASKET

STEP 14

PUSH ROD

)

-

24

-

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

51

EH09D

EH09D

EH12-2D

STEP 15

.laeslioehtegamadottonluferaceB

revocgniraebniaM

.revocfoecafrusretuo

dnuorapatylnevednaremmahtfosaesU

.scp9;03x6M

.scp3;61x8M
.scp2;61x6M

dna).C.B.M(tekcarB

.scp8;03x6M

revocgniraebniam

Fig. 5-15

M6 x 30 BOLT AND
WASHER AY : 9 pcs.

EH12-2D

M8 x 16 FLANGE
BOLT : 2 pcs.

MAIN BEARING
COVER CP

SUPPORT
(

MAIN BEARING COVER

STEP 15

MAIN BEARING COVER CP

)

GASKET
(

BREATHER COVER

BRACKET
(

MAIN BEARING

COVER

M6 x 16 FLANGE
BOLT : 2 pcs.

M8 x 16 FLANGE
BOLT : 1 pce.

)

)

M6 x 30 BOLT AND
WASHER AY : 8 pcs.

Fig. 5-14

-

25

-

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

hsupedisleehwylfehtnoesacknracyaL

evomerdnakcolbehtotnipusteppat

61steppatdnatfahsmaC

.tfahsmac

dnatfahsmacegamadottonluferaceB

.steppat

TAPPET

CAMSHAFT

STEP 16

Fig. 5-17

CAMSHAFT

Fig. 5-16

-

26

-

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

dnadorgnitcennoC

notsip

71

.pacdorgnitcennoc

.rednilycfodnereppu

nipnotsipdnanotsiPevomerotnipnotsipdnaspilcevomeR)1(

.dorgnitcennocdna

.gnitsiwtrohcumoot

EH09D EH12-2D

PISTON RING

CLIP

PISTON RING

dnastlobdorgnitcennocevomeR)1(

scp2;52x5M

)D90HE(

pototsemocnotsiplitnutfahsknarcnruT)2(

dnadorgnitcennoctuohsup,retnecdaed

scp2;43x6M

)D2-21HE(

.rednilycfopothguorhtylbmessanotsip

thgimtahtstisopednobracllaffoeparcS*

morfnotsipfolavomerhtiwerefretni

.notsipmorfdorgnitcennoc

.notsipmorfsgnirnotsipevomeR)2(

notsipehtegamadottonluferaceB*

gnidaerpsybsgnirkaerbottonluferaceB

CLIP

PISTON

PISTON PIN

CLIP

CONNECTING ROD

STEP 17 STEP 17

M5 x 25
CONNECTING
ROD BOLT
: 2 pcs.

PISTON

PISTON PIN

CLIP

CONNECTING ROD

Fig. 5-18

-

27

-

M6 x 34
CONNECTING
ROD BOLT
: 2 pcs.

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

tfahsknarcfodneleehwylfnoylthgilpaT

81tfahsknarC

.esacknarc

morfevomerotremmahtfosahtiw

.laeslioegamadottonluferaceB*

STEP 18

CRANKSHAFT

Fig. 5-19

Fig. 5-20

-

28

-

petSevomerotstraPserudecorpdnaskrameRsrenetsaF

tsuahxednaekatnI

sevlav

ekat,reniatergnirpsehtnwodsserP)1(

evomernehtdna,evlavtelloctuo

.gnirpsevlavdnareniatergnirps

91

.daehrednilycmorf

sevlavtsuahxednaekatnievomeR)2(

ehtmorftisopedmugdnanobracnaelC*

.sediugdnastrop,staesevlav,sevlav

.sediugdnastaesevlav,sevlavtcepsnI

STEP 19

BOLT (PIVOT) : 2 pcs.

ROCKER ARM

COLLET

Fig. 5-22

SPRING
RETAINER

VALVE
SPRING

EXHAUST VALVE

M6 NUT
: 2 pcs.

GUIDE PLATE

INTAKE VALVE

Fig. 5-21

-

29

-

5-4 REASSEMBLY PROCEDURES

● PRECAUTIONS FOR REASSEMBLY

1) Clean parts thoroughly before reassembly.

Pay close attention to the cleanliness of piston, cylinder, crankshaft, connecting rod and bearings.

2) Scrape off all carbon deposits from cylinder head, piston top and piston ring grooves.

3) Check lip of oil seals. Replace oil 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 refer to the "TORQUE SPECIFICATIONS" (See page 76).

7) Apply oil to rotating and sliding portions.

8) Check and adjust clearances and end plays where specified in this manual.

5-4-1 CRANKSHAFT

(1) Install crankshaft in crankcase wrapping the

keyway with pol y viny l ta pe to av oi d dam age
to oil seal.

(2) Install woodruff key for flywheel on crankshaft.

CRANKSHAFT

5-4-2 PISTON AND PISTON RINGS

(1) Install oil ring first, then second ring and top

ring.
Spread ring only far enough to slip over pis-

ton and into correct groove. Use care not to
distort ring.

Install second ring with punch ed mark bes ide
the gap face upward. (See Fig. 5-26a, 26b)

POLYVINYL TAPE

Fig. 5-23

OPEN ENDS OF PISTON RING

Fig. 5-24

-

30

-

①

TOP

1

RING

EH09D
EH12-2D

BARREL

MARK "RN"

②
③

2

3

Fig. 5-25

SECOND
RING

OIL
RING

MARK "R"

EH09D

EH12-2D

EH09D

EH12-2D

TAPER

TAPER
UNDER CUT

CUTTER

CUTTER RING WITH
COIL EXPANDER

RING

Model: EH09D Model: EH12-2D

Fig. 5-26a

5-4-3 PISTON AND CONNECTING ROD

(1) EH09D

The direction of piston on connecting rod is
not specified.

EH12-2D

When installing the piston on the connecting
rod, place the valve recess of the piston crown
as shown in the illustration to the “MAG” side
of the connecting rod.

(2) Apply oil to the small end of connecting rod,

piston and piston pin before assembling.
Be sure to use clips on the both side of the

piston pin to secure piston pin in position.

"MA"
MARK

Model: EH09D

Fig. 5-26b

"MAG"
MARK

VALVE RECESS

Model: EH12-2D

Fig. 5-27

-

31

-

(3) Install piston and connecting rod assembly

into cylinder.
Use a piston ring compressor to hold piston

rings.
The “MA” mark (EH09D) ,“MAG” mark (EH12-

2D) of the connecting rod is to face the fly­wheel side of the engine when assembled.

Note:

PISTONRING
COMPRESSOR

CONNECTING ROD

("MA"SIDEEH09D)

("MAG"SIDE EH12-2D)

(1) Apply enough oil to lubricate the pis-

ton rings, connecting rod bearings
and cylinder bore before assembly.

(2) Set gaps of the piston rings 90 de-

grees apart from each other before
assembly.

5-4-4 CONNECTING ROD

(1) Turn crankshaft to bottom dead center, lightly

tap top of the piston until large end of the rod
meet crank pin.

(2) Install connecting rod cap to connecting rod.

Make sure to match the alignment marks on
the rod caps.

CRANKCASE (FLYWHEEL SIDE)

Fig. 5-28

SECOND RING

OIL RING

TOP RING

Fig. 5-29

Torque connecting rod bolts to specification.
M5 x 25 mm connecting rod bolt : 2 pcs. (EH09D)
M6 x 34 mm connecting rod bolt : 2 pcs. (EH12-2D)

euqrotgninethgiT

D90HED2-21HE

N8.7-9.5 ・m

gk08-06( ・ )mc

tf7.5-3.4( ・ ).bl

N11-8.8 ・m

gk511-09( ・ )mc

tf3.8-5.6( ・ ).bl

(3) Check for free movement of connecting rod

by turning crankshaft slowly.

-

32

-

ALIGNMENT
MARK

Model: EH09D Model: EH12-2D

ALIGNMENT
MARK

Fig. 5-30

5-4-5 TAPPETS AND CAMSHAFT

G

(1) Oil the tappets and install them.

Push in fully to avoid damage during camshaft
installation.

(2) Lubricate bearing surfaces of camshaft.

Align the timing mark on crankshaft gear with
the timing mark on camshaft and install cam­shaft in the crankcase. (See Fig. 5-31a)

CAUTION :
Incorrect valve timing will cause mal-

function of the engine.

5-4-6 ADJUST CRANKSHAFT END PLAY

TIMING MARK

CRANKSHAFT

EAR

CAMSHAFT

Fig. 5-31a

(1) Adjust end play to 0.2 mm (0.008") using the

proper spacer.
The proper spacer may be determined in the

following manner.

1) Measure the height “A” (From the mating
surface to the inner race of the ball bear­ing.)

2) Measure the depth “B” (From the mating
surface to the crank gear.)
B-A = SIDE CLEARANCE (mm)
(SIDE CLEARANCE)-0.2 mm = THICK­NESS OF CRANKSHAFT SHIM (mm)

B-A = SIDE CLEARANCE (in.)
(SIDE CLEARANCE)-0.008 in.= THICK­NESS OF CRANKSHAFT SHIM (in.)
Following are available spacer shims.

TFAHSKNARC

).ni420.0(mm6.0=T

SMIHSRECAPS

Table. 5-1

).ni130.0(mm8.0=T
).ni930.0(mm0.1=T

Fig. 5-31b

-

33

-

(2) Lubricate the oil seal and bearing surfaces.

Coat the surface of the main bearing cover with sealant (Three bond 1216).
Place spacer chosen in step (1) on crankshaft.
Use an oil seal guide when installing the main bearing cover to avoid damaging the oil seal .
Tap the cover into place with a soft hammer.
Main bearing cover EH09D M6 x 30 mm bolt and washer : 9 pcs.

EH12-2D M6 x 30 mm bolt and washer : 8 pcs.

euqrotgninethgiT

D2-21HE,D90HE

N8.11-8.9 ・m

gk021-001( ・ )mc

tf7.8-2.7( ・ ).bl

EH09D

M6 x 30 BOLT AND
WASHER AY : 9 pcs.

EH12-2D

SPACER

SEALANT
(

Three bond 1216

MAIN BEARING COVER CP

SPACER

CRANKSHAFT

MAIN BEARING
COVER CP

)

CAMSHAFT

CRANKCASE

SEALANT
(

Three bond 1216

)

M6 x 30 BOLT AND
WASHER AY : 8 pcs.

Fig. 5-32

-

34

-

CRANKSHAFT

CAMSHAFT

CRANKCASE

5-4-7 CYLINDER HEAD

(1) Clean carbon and gum deposits from the valves, seats, ports and guides. Inspect valves, valve seats

and valve guides.
(2) Replace valves that are badly burned, pitted or warped.
(3) When installing valves in cylinder head, oil the valve stems and insert them into valve guide.

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

(4) Valve guides should be replaced when valve stem clearance exceeds specifications (See “SERVICE

DATA”).

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 and wash cylinder head thoroughly.

(5) Install cylinder head onto cylinder with new head gasket.

Tighten four flange bolts evenly in three steps by the following tightening torque:

Cylinder head M8 x 55 mm bolt : 4 pcs. (EH09D)

)D90HE(euqrotgninethgiT

petsts1petsdn2petSlaniF

N0.5 ・m
gk05( ・ )mc

tf6.3( ・ ).bl

N8.9 ・m

gk001( ・ )mc

tf2.7( ・ ).bl

Cylinder head M8 x 65 mm bolt : 4 pcs. (EH12-2D)

)D2-21HE(euqrotgninethgiT

petsts1petsdn2petSlaniF

N0.5 ・m
gk05( ・ )mc

tf6.3( ・ ).bl

N8.9 ・m

gk001( ・ )mc

tf2.7( ・ ).bl

N6.02-6.81 ・m

gk012-091( ・ )mc

tf2.51-7.31( ・ ).bl

N0.62-0.32 ・m

gk072-032( ・ )mc

tf0.03-0.71( ・ ).bl

-

35

-

5-4-8 ROCKER ARMS AND PUSH RODS

(1) Insert push rods into crankcase.

Put push rod tip in the hollow of tappet top.

Note:
An oil return slot is located next to the tappet boss. If you do not put the push rod in the

tappet properly, the push rods will fall into the crankcase.
Removal of the main bearing cover is necessary to get them out.

(2) Apply oil to rocker arms and assemble them to cylinder head using pivot bolt and nut.

M6 x 60 BOLT AND
WASHER AY : 4 pcs.

BOLT (PIVOT) : 2 pcs.

ROCKER ARM

COLLET

ROCKER COVER

SPRING RETAINER

VALVE SPRING

M8 x 55 FLANGE
BOLT : 4 pcs.

M6 NUT

: 2 pcs.

EXHAUST VALVE

GASKET

GASKET

GUIDE PLATE

CYLINDER

HEAD CP

INTAKE VALVE

PUSH ROD

Fig. 5-33

-

36

-

5-4-9 VALVE CLEARANCE ADJUSTMENT

THICKNESS GAUGE

ROCKER ARM

BOLT
(

PIVOT

)

NUT

Note:
T emporally fit the flywheel in position for

easy operation.

(1) EH09D

Position the piston at the top dead center of

compression stroke by matching the alignment

mark of flywheel with the alignment mark of

crankcase.

EH12-2D

Position the piston at the top dead center of

compression stroke. The top dead center may

be obtained by placing the key slot on the

power take off shaft to 10 o’clock position. (See

Fig. 5-34b)
(2) Loosen the nut under the rocker arm and turn

the bolt (pivot) to adjust the clearance between

rocker arm and valve stem end.

Tighten the nut on rocker arm.

Valve clearance : 0.07 - 0.13 mm

(0.0028 - 0.0051 in.)

ALIGNMENT
MARKS

Model: EH09D

Fig. 5-34a

45°

Model: EH12-2D

Fig. 5-34b

FLYWHEEL

P.T.O

Note:
Check and adjust valve clearance while

engine is cold.
Check operation of valves by turning

crankshaft. Then recheck the valve clear­ance.

(3) Install rocker cover and gasket.

Rocker cover M6 x 25 mm bolt : 4 pcs.

Fig. 5-35

-

37

-

5-4-10 SPARK PLUG

Install spark plug to cylinder head.

Spark plug : NGK BM6A, BMR6A (EH09)

: NGK B6ES, BR6ES (EH12-2D)

)D90HE(euqrotgninethgiT

gulpkrapsweNgninethgiteR

N7.41-8.11 ・m

gk051-021( ・ )mc

tf9.01-7.8( ・ ).bl

N5.42-6.22 ・m

gk052-032( ・ )mc

tf1.81-6.61( ・ ).bl

5-4-11 FLYWHEEL MAGNETO

(1) Put the woodruff key in the keyway of crank-

shaft. Wipe off oil and grease thoroughly from
the tapered portion of crankshaft and flywheel
center hole.

(2) Install the flywheel to crankshaft.

Tighten the flywheel nut with the starter pul­ley.

euqrotgninethgiT

gulpkrapsweNgninethgiteR

N7.41-8.11 ・m

gk051-021( ・ )mc

tf9.01-7.8( ・ ).bl

)D2-21HE(euqrotgninethgiT

N5.62-6.22 ・m

gk072-032( ・ )mc

tf5.91-6.61( ・ ).bl

D90HED2-21HE

N1.94-2.44 ・m

gk005-054( ・ )mc

tf2.63-5.23( ・ ).bl

N0.36-0.95 ・m

gk056-006( ・ )mc

tf0.74-0.34( ・ ).bl

Fig. 5-36

-

38

-

5-4-12 IGNITION COIL

THICKNESS GAUGE

IGNITION
COIL

Install ignition coil to crankcase.
Pay attention the direction of ignition coil and the

location of code.
Adjust air gap between ignition coil and flywheel

using a thickness gauge and tighten bolts.
M6 x 25 mm bolt and washer : 2 pcs.

Air gap : 0.3 - 0.5 mm

(0.012 - 0.020 in.)

euqrotgninethgiT

N8.01-8.8 ・m

gk011-09( ・ )mc

tf0.8-5.6( ・ ).bl

IGNITION COIL

Model: EH09D

Fig. 5-37a

THICKNESS
GAUGE

5-4-13 INTAKE PIPE, INSULATOR (EH12-2D)

(1) Install the intake pipe to the cylinder head with

gasket.

M6 flange nut : 2pcs.

M6 x 40 mm bolt and washer : 1pce.

Tightening torque : 9.8 - 13.7 N・m

(100 - 140 kg・cm)
(7.2 - 10.1 ft・lb.)

Then put the gasket and insulator on the intake
pipe.

M6 NUT : 2 pcs.

GASKET

Model: EH12-2D

Fig. 5-37b

M6 x 40 BOLT
AND WASHER AY: 1 pce.

INTAKE
PIPE

Fig. 5-38

-

39

-

5-4-14 GOVERNOR, SPEED CONTROL SYSTEM AND CARBURETOR

EH09D

(1) Install governor lever to governor shaft, then tighten the locking bolt temporarily.
(2) Install base plate to crankcase.
(3) Install speed control lever, friction washer, pivot bolt, etc. to base plate as shown in illustration.
(4) Hook governor spring to proper holes of governor lever and speed control lever. (See Fig. 5-40a)
(5) Install insulator and gaskets for carburetor to cylinder head.

(6) Install carburetor to cylinder head hooking governor rod to governor lever and throttle lever of carbu-

retor. Hook rod spring over governor rod.

(7) Attach air cleaner base to carburetor. Tighten two flange nuts and a bolt. Connect breather pipe from

rocker cover to cleaner base.

M6 x 8 FLANGE
BOLT : 2 pcs.

SPACER

SPEED CONTROL
LEVER AY

BASE
PLATE CP

GOVERNOR SHAFT

M6 BOLT AND
WASHER AY : 1 pce.

RETURN
SPRING

ROD SPRING

GOVERNOR LEVER

FRICTION WASHER

INSULATOR

GOVERNOR ROD

GOVERNOR SPRING

M6 PIVOT BOLT

: 1 pce.

GASKET (INSULATOR

CARBURETOR

)

Fig. 5-39a

-

40

-

EH12-2D

(1) Install governor lever to governor shaft, then tighten the locking bolt temporarily.
(2) Install speed control lever, pivot bolt, etc. as shown in illustration.
(3) Hook governor spring to proper holes of governor lever and speed control lever. (See Fig. 5-40b)
(4) Install insulator and gaskets for carburetor to intake pipe.

(5) Install carburetor to intake pipe hooking governor rod to governor lever and throttle lever of carbure-

tor. Hook rod spring over governor rod.

(6) Attach air cleaner base to carburetor. Tighten two flange nuts and a bolt. Connect breather pipe from

rocker cover to cleaner base.

INSULATOR

CARBURETOR

ROD SPRING

WIRE BRACKET

GOVERNOR

LEVER

M6 BOLT AND
WASHER AY : 1 pce.

M6 x14 FLANGE BOLT : 1 pce.

Fig. 5-39b

GOVERNOR
ROD

GOVERNOR
SPRING

NUT

GASKET
(

INSULATOR

M6 PIVOT BOLT : 1 pce.

)

SPEED CONTROL LEVER

M6 x 12 FLANGE
BOLT : 1 pce.

PROTECTOR

M8 x 16 BOLT AND
WASHER AY : 1 pce.

-

41

-

5-4-15 AIR CLEANER

Install the air cleaner gasket and the cleaner base
and tighten them with 2-M6 flange nuts.

Then install the element and the cleaner case.

5-4-16 ADJUST GOVERNOR SYSTEM

(1) Turn the speed control lever all the way toward the high speed position and fix it by tightening self lock

nut.

(2) Check that the governor lever is pulled by the governor spring and carburetor throttle valve is fully

open.

(3) Turn the governor shaft clockwise all the way using a screw driver, and tighten lock bolt to secure the

lever on the shaft.

(4) Loosen the self lock nut to allow the speed control lever to move freely.

GOVERNOR ROD SPRING

GOVERNOR
ROD

GOVERNOR
LEVER

GOVERNOR

GOVERNOR
SHAFT

Model: EH09D

Fig. 5-40a

SPRING

Normal hooking

position

SPEED CONTROL

LEVER

GOVERNOR
ROD SPRING

GOVERNOR
ROD

GOVERNOR
LEVER

Normal hooking

position

GOVERNOR

SPRING

SPEED CONTROL

LEVER

GOVERNOR
SHAFT

Model: EH12-2D

Fig. 5-40b

-

42

-

5-4-17a CYLINDER BAFFLE, MUFFLER BRACKET and MUFFLER (EH09D)

(1) Temporarily install cylinder baffle, muffler

bracket and blower housing bracket 2 to the

cylinder head.

: M6 flange nut : 2 pcs.

Do not tighten the flange nut fully.

(2) Temporarily install muffler and gasket to cylin-

der head.

: M6 self lock nut : 2 pcs.

: M6 x 12 mm bolt and washer : 2 pcs.

(3) Finally, tighten the self lock nut etc. fully,

according to the following priority.

1 1

1 M6 self lock nut : 2 pcs.

1 1

2 2

2 M6 x 12 mm bolt and washer : 2 pcs.

2 2

3 3

3 M6 flange nut : 2 pcs.

3 3

M6 x 12 BOLT AND

2

WASHER AY : 2 pcs.

MUFFLER

MUFFLER CP

BRACKET CP

3

GASKET
(

MUFFLER

euqrotgninethgiT

N8.01-8.8 ・m

gk011-09( ・ )mc

tf0.8-5.6( ・ ).bl

M6 FLANGE NUT : 2 pcs.

BLOWER HOUSING
BRACKET CP 2

CYLINDER BAFFLE

)

M6 SELF LOCK

1

NUT : 2 pcs.

Fig. 5-41a

-

43

-

5-4-17b HEAD COVER, MUFFLER BRACKET and MUFFLER (EH12-2D)

(1) Temporarily install head cover and muffler

bracket to cylinder head.
: M6 x 18 mm flange bolt : 2 pcs.

(2) Temporarily install muffler, gasket (muf fler) and

spacer (exhaust) to cylinder head.
: M8 self lock nut : 2 pcs.
: M8 x 16 mm bolt and washer : 4 pcs.

N5.62-5.22 ・m

(3) Finally, tighten the self lock nut etc. fully,

according to the following priority.

1 1

1 M8 self lock nut : 2 pcs.

1 1
2 2

2 M8 x 16 mm bolt and washer : 2 pcs.

2 2
3 3

3 M8 x 16 mm bolt and washer : 2 pcs.

3 3
4 4

4 M8 x 18 mm flange bolt : 2 pcs.

4 4

gk072-032( ・ )mc

tf5.91-5.61( ・ ).bl

N8.01-8.8 ・m

gk011-09( ・ )mc

tf0.8-5.6( ・ ).bl

)8M(euqrotgninethgiT

)6M(euqrotgninethgiT

M8 x 16 BOLT AND

2

WASHER AY : 2 pcs.

MUFFLER

M8 SELF LOCK

1

NUT : 2 pcs.

M8 WASHER : 2 pcs.

M8 x 16 BOLT AND

3

WASHER AY : 2 pcs.

M6 x 18 FLANGE

4

BOLT : 2 pcs.

Fig. 5-41b

GASKET
(

MUFFLER

)

A

SPACER
(

EXHAUST

A

)

MUFFLER BRACKET

HEAD COVER

-

44

-

5-4-18 BLOWER HOUSING AND RECOIL STARTER

(1) Attach blower housing to crankcase. Tighten

five flange bolts.
M6 x 12 mm flange bolt : 5 pcs.
Insert the high tension cord from the ignition

coil into the notch of the blower housing so as
not to pinch the cord.

(2) Install recoil starter to blower housing.

M6 x 8 mm flange bolt : 4 pcs.

Note:
Be careful of pulling direction of starter

rope.

5-4-19 STOP SWITCH

(1) Install stop switch to blower housing.
(2) Connect wires referring to the wiring diagram.

-

End of the reassembly

-

CLAMP

STOP SWITCH
STOP SWITCH WIRE

Model: EH12-2D

Fig. 5-42

-

45

-

5-5 BREAK-IN OPERATION

A new engine or an engine that has been completely overhauled by being fitted with a new piston, rings,
valves and connecting rod should be thoroughly RUN-IN before being put back into service.

Good bearing surfaces and running clearances between the various parts can only be established by
operating the engine under reduced speed and loads for a short period of time.

While the engine is being tested, check for oil leaks.
Make final carburetor adjustment and regulate the engine operating speed.

petSdaoLdeepSenignEemiT

1petS daoLoNmpr005,2.nim01
2petS daoLoNmpr000,3.nim01
3petS daoLoNmpr006,3.nim01

4petS

5petS

D90HE)PH0.1(Wk7.0

mpr006,3.nim03

D2-21HE)PH4.1(Wk0.1

D90HE)PH9.1(Wk4.1

mpr006,3.nim06

D2-21HE)PH8.2(Wk1.2

Table. 5-2

6. MAGNETO

6-1 OPERATION AND FUNCTION

The ignition system of the EH09D and EH12-2D is a breakerless flywheel magneto with an automatic
advancing system.

Being different from the breaker point type ignition system, this system is completely free from such
troubles as starting-up failure due to dirty, burnt or corroded point surface.

The electronic automatic advancing ensures extremely easy starts and stable high performance at oper­ating speed by advancing the ignition timing to the most suitable point.

6-2 BASIC THEORY

(1) Revolution of the flywheel generates electricity on the primary side of the ignition coil, and the base

current I
Current I

1 flows to the power transistor.

1 turns the power transistor “ON” and the electric current I2 flows.

-

46

-

(2) At lower engine revolution, when the flywheel reached the ignition point the low speed ignition timing

control circuit operates to run the base current I
current I

1 to bypass as current I4.

3 to turn the signal transistor A “ON” allowing the

At this moment the power transistor turns “OFF” and the current I

2 is abruptly shut off resulting in the

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

(3) At higher engine revolution, the advancing control circuit operates at the ignition timing to run the

base current I
At this moment the power transistor turns “OFF” and the current I

5 to turn the signal transistor B “ON” allowing the current I1 to bypass as current I6.

2 is abruptly shut off resulting in the

high voltage generated in the secondary coil which produces sparks at the spark plug.
The operating timing of the advancing control circuit advances in accordance with the increase of

engine speed resulting in the advancing of ignition timing as shown in Fig. 6-1(b).

I1

Power Transistor

Primary Coil

Secondary Coil

Spark plug

I2

Signal Transistor B

Low Speed

Ignition

Timing

Control Circuit

Resister

I3

Signal Transistor A

Automatic

Advancing

Control

Circuit

I5

I4

I6

Fig. 6-1a

(

B.T.D.C.

IGNITION TIMING

23°

18°

15°

-

)

500 1000 2000 3000

47

-

ELECTRONIC ADVANCING FLYWHEEL

MAGNETO SYSTEM

STEP ADVANCING

ENGINE REVOLUTION

Fig. 6-1b

(

EH12-2D

(

EH09D

(r.p.m.)

)

)

6-3 WIRING DIAGRAM

● STANDARD

Fig. 6-2

-

48

-

7. AUTOMATIC DECOMPRESSION SYSTEM

EH09D and EH12-2D engines employ an automatic decompression system as a standard feature. This
enables easy starting of the engine, with lighter recoil pull.
The automatic decompression system releases the compression of the engine by lifting up the exhaust
valve at cranking speeds. The following is the explanation of how the system works.

At the end of the compression process, the release lever lifts up the tappet which in turns opens up the
exhaust valve slightly to release the compression. The release lever has a flyweight on its end and
another end of the lever is a crescent cam.
When the engine is cranked, the crescent cam projects above the cam profile and lifts up the tappet
because the gravity force on the weight is larger than the centrifugal force on the weight.

TAPPET

FLYWEIGHT

CRESCENT CAM

RELEASE LEVER

EXHAUST CAM

ROTATION

EXHAUST CAM

CAMSHAFT

Fig. 7-1

When the cranking speed reaches a specified r.p.m., the crescent cam is retracted under the cam profile
because the centrifugal force applied to the flyweight becomes larger than the force of gravity on the
weight and thus it is shifted to the position shown in the illustration below.

FLYWEIGHT

TAPPET

RELEASE LEVER

CRESCENT CAM

EXHAUST CAM

ROTATION

EXHAUST CAM

CAMSHAFT

Fig. 7-2

-

49

-

8a. FLOAT TYPE CARBURETOR (EH09D)

8a-1 OPERATION AND CONSTRUCTION
8a-1-1 FLOAT SYSTEM

The float chamber is located below the carbure­tor body and, with a float and a needle valve,
maintains a constant fuel level during engine op­eration.

The fuel flows from the fuel tank into the float
chamber through the needle valve. When the fuel
rises to a specific level, the float rises, and when
its buoyancy and fuel pressure are balanced, the
needle valve closes to shut off the fuel, thereby
keeping the fuel at the predetermined level.

FLOAT

FUEL

NEEDLE VALVE

Fig. 8-1

BY-PASS

PILOT OUTLET

PILOT JET

PILOT AIR JET

MAIN NOZZLE

CHOKE

AIR
INTAKE

FLOAT

MAIN AIR JET

MAIN JET

Fig. 8-2

-

50

-

8a-1-2 PILOT SYSTEM

The pilot system feeds the fuel to the engine during idling and low-speed operation. The fuel is fed
through the main jet to the pilot jet, where it is metered, and mixed with the air metered by the pilot air jet.
The fuel-air mixture is fed to the engine through the pilot outlet and the bypass. At idling speed, the fuel
is mainly fed from the pilot outlet.

8a-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 is atomized out of the main bore. It is mixed
again with the air taken through the air cleaner into an optimum fuel-air mixture, which is supplied to the
engine.

8a-1-4 CHOKE

The choke is used for easy starting when the engine is cold. When the starter is operated with a closed
choke, the negative pressure applied to the main nozzle increases and draws more fuel ; thus richening
the mixture and making starting the engine easier.

8a-2 DISASSEMBLY AND REASSEMBLY

Apart from mechanical failures, most of carbure­tor troubles are caused by an incorrect mixing
ratio, which may arise mainly due to a clogged up
air or fuel passage in jets, or fuel level variations.
In order to assure proper flow of air and fuel, the
carburetor must be kept clean at all times. The
carburetor disassembly and reassembly proce­dures are as follows.

8a-2-1 THROTTLE SYSTEM

(1) The spring

the throttle stop screw

(2) Remove the philips screw

ww

w, and pull out the throttle shaft

ww

*Be careful not to damage throttle valve rim.

rr

r can be taken out by removing

rr

tt

t.

tt

qq

q and throttle valve

qq

ee

e.

ee

1

12

15

17

11

3 4 5 62

789

13
16
19
18

14
10

Fig. 8-3

-

51

-

8a-2-2 CHOKE SYSTEM

(1) Remove the philips screws

(2) When reassembling the choke shaft, make sure that the cutout in the choke valve faces the pilot air

jet.

yy

y and choke valve

yy

uu

u, and pull out the choke shaft

uu

ii

i.

ii

8a-2-3 PILOT SYSTEM

(1) Remove the pilot jet
(2) Reassembly

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

oo

o, using correct tool to avoid damage to it.

oo

8a-2-4 MAIN SYSTEM

(1) Remove the bolt
(2) Remove the main jet
(3) Reassembly

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

engine malfunction.

!0!0

!0 and take out float chamber body

!0!0

!3!3

!3 and guide holder from the body

!3!3

!1!1

!1.

!1!1

!2!2

!2 .

!2!2

b) The bolt

!1!1

!1.

!1!1

!0!0

!0 tightening torque is 90 kg-cm. Be sure to set the gasket

!0!0

!5!5

!5 and washer

!5!5

8a-2-5 FLOAT SYSTEM

(1) Pull out the float pin

needle valve needs to be replaced, replace it with rubber needle.

CAUTION :
When cleaning the jets, use neither a drill nor a wire (because of possible damage of the

orifice which will adversely affect fuel flow). Be sure to use compressed air to blow them
clean.

(2) When removing the needle valve and float, gently tap the reverse side of the float pin

more slender than the float pin and remove, since the float pin is pressed into the carburetor body.

!6!6

!6 and remove the float

!6!6

!7!7

!7 and then remove the clip

!7!7

!8!8

!8 and needle valve

!8!8

!4!4

!4 for chamber

!4!4

!9!9

!9. If the

!9!9

!6!6

!6 using a rod

!6!6

-

52

-

8b. FLOAT TYPE CARBURETOR (EH12-2D)

PILOT OUTLET

BY-PASS

PILOT AIR JET

CHOKE

AIR
INTAKE

MAIN AIR JET

MAIN NOZZLE

FLOAT

NEEDLE VALVE

FUEL

PILOT JET

FLOAT

MAIN JET

8b-1 OPERATION AND CONSTRUCTION
8b-1-1 FLOAT SYSTEM

The float chamber is located below the carbure­tor body and, with a float and a needle valve,
maintains a constant fuel level during engine op­eration.

The fuel flows from the fuel tank into the float
chamber through the needle valve. When the fuel
rises to a specific level, the float rises, and when
its buoyancy and fuel pressure are balanced, the
needle valve closes to shut off the fuel, thereby
keeping the fuel at the predetermined level.

Fig. 8-4

Fig. 8-5

-

53

-

8b-1-2 PILOT SYSTEM

The pilot system feeds the fuel to the engine during idling and low-speed operation.
The fuel is fed through the main jet to the pilot jet, where it is metered, and mixed with the air metered by
the pilot air jet. The fuel-air mixture is fed to the engine through the pilot outlet and the bypass. At idling
speed, the fuel is mainly fed from the pilot outlet.

8b-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 is atomized out of the main bore. It is mixed
again with the air taken through the air cleaner into an optimum fuel-air mixture, which is supplied to the
engine.

8b-1-4 CHOKE

The choke is used for easy starting when the engine is cold. When the starter is operated with a closed
choke, the negative pressure applied to the main nozzle increases and draws more fuel ; thus richening
the mixture and making starting the engine easier.

8b-2 DISASSEMBLY AND REASSEMBLY

Apart from mechanical failures, most of carbure­tor troubles are caused by an incorrect mixing
ratio, which may arise mainly due to a clogged up
air or fuel passage in jets, or fuel level variations.
In order to assure proper flow of air and fuel, the
carburetor must be kept clean at all times. The
carburetor disassembly and reassembly proce­dures are as follows.

8b-2-1 THROTTLE SYSTEM

(1) Remove the philips screw

ww

w, and pull out the throttle shaft

ww

(2) The spring

rr

r can be taken out by removing

rr

the throttle stop screw

*Be careful not to damage throttle valve rim.

qq

q and throttle valve

qq

ee

e.

ee

tt

t.

tt

14

15
17

16
19

21

13

1

2

3

11

7

6

5

4

8

9

10

20

23
22

18
12

Fig. 8-6

-

54

-

8b-2-2 CHOKE SYSTEM

(1) Remove the philips screws

(2) When reassembling the choke shaft, make sure that the cutout in the choke valve faces the pilot air

jet. Meanwhile, when reassembling set the rings

yy

y and choke valve

yy

uu

u, and pull out the choke shaft

uu

oo

o and

oo

!0!0

!0 at the right position.

!0!0

ii

i.

ii

8b-2-3 PILOT SYSTEM

(1) Remove the pilot jet
(2) Reassembly

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

!1!1

!1, using correct tool to avoid damage to it.

!1!1

8b-2-4 MAIN SYSTEM

(1) Remove the bolt
(2) Remove the main jet
(3) Reassembly

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

and cause engine malfunction.

!2!2

!2 and take out float chamber body

!2!2

!6!6

!6 and guide holder

!6!6

!7!7

!7 from the body

!7!7

!3!3

!3.

!3!3

!4!4

!4 . And then remove the main nozzle

!4!4

!5!5

!5.

!5!5

b) The bolt

!3!3

!3.

!3!3

!2!2

!2 tightening torque is 70 kg-cm. Be sure to set the gasket

!2!2

!9!9

!9 and washer

!9!9

8b-2-5 FLOAT SYSTEM

(1) Pull out the float pin

needle valve needs to be replaced, replace it with rubber needle.

CAUTION :
When cleaning the jets, use neither a drill nor a wire (because of possible damage of the

orifice which will adversely affect fuel flow). Be sure to use compressed air to blow them
clean.

(2) When removing the needle valve and float, gently tap the reverse side of the float pin

more slender than the float pin and remove, since the float pin is pressed into the carburetor body.

@0@0

@0 and remove the float

@0@0

@1@1

@1 and then remove the clip

@1@1

@2@2

@2 and needle valve

@2@2

!8!8

!8 for chamber

!8!8

@3@3

@3. If the

@3@3

@0@0

@0 using a rod

@0@0

-

55

-

8c. DIAPHRAGM TYPE CARBURETOR (OPTION)

8c-1 OPERATION AND CONSTRUCTION

4

3
1

8

15
14
16

13
10

Fig. 8-7

2
5
6

19
20

18
17

7
11

12
9

1. ENGINE IMPULSE

The alternating action of the positive pressure and negative pressure inside the engine crankcase oper­ates the fuel pump diaphragm.

2. FUEL PUMP DIAPHRAGM

The fuel pump diaphragm undulates in response to the engine impulse and as a result of that movement
it feeds the fuel through the fuel pump valve.

3. FUEL INLET

The fuel inlet is the opening through which fuel is sucked from the fuel tank.

4. INLET VALVE

The inlet valve opens when the diaphragm is submitted to the action of a negative pressure in response
to the movement of the pump diaphragm and the inlet valve shuts when it is submitted to a positive
pressure.

5. OUTLET VALVE

Oppositely to the inlet valve, the outlet valve shuts when it is submitted to the action of a negative
pressure and opens when submitted to a positive pressure.

-

56

-

6. INLET SCREEN

The inlet screen filters the fuel that is sucked from the fuel tank to the carburetor.

7. INLET NEEDLE VALVE

The inlet needle valve controls the fuel that is fed from the fuel pump to the metering chamber.

8. THROTTLE VALVE

The throttle valve controls the volume of air sucked into the engine, thereby changing the engine speed.

9. AIR VENT HOLE

The air vent hole is open to the atmosphere, with the purpose of allowing smooth operation of the
metering diaphragm.

10. METERING DIAPHRAGM

The metering diaphragm has the function of operating the metering lever, which is pulled up by the
variations in the negative pressure of the engine.

11. METERING LEVER

The metering lever has the function of opening/shutting the inlet needle valve by transmitting the move­ments of the metering diaphragm to that valve.

12. METERING LEVER SPRING

The metering lever spring has the function of pushing up the metering lever, thereby shutting the needle
valve when the engine is stopped and when the metering chamber is full of fuel.

13. METERING CHAMBER

The metering chamber is the fuel storage compartment that has the function of supplying fuel to the
nozzle holes and other parts.

14. FIRST IDLE HOLE

The first idle hole is the only fuel supply hole that is available when the engine is idling.

15. SECOND AND THIRD IDLE HOLES

The second and the third idle holes have the function of supplying fuel when the throttle is at an interme­diate opening state between the idling state and the fully open state.

-

57

-

16. IDLE NEEDLE

The idle needle has the function of controlling the fuel when the engine is at idling speeds and when the
throttle is at a low speed position.

17. HIGH SPEED NEEDLE

The high speed needle has the function of controlling the fuel when the engine is operating at high speed
and when the throttle is at a high speed position.

18. MAIN NOZZLE

The main nozzle is the hole through which fuel is ejected when the engine is operating at high speed and
when the throttle is at a high speed position.

19. VENTURI

The venturi has the function of increasing the air flow at the nozzle section, thereby improving the atomi­zation of the fuel.

20. CHOKE VALVE

The choke valve has the function of shutting the suction of air when the engine is started at cold state,
thereby securing the temporary supply of a rich fuel/air mixture.

-

58

-

8c-2 DISASSEMBLY PROCEDURE

Prior do disassembling the carburetor, make sure
to wash it with clean gasoline, washing oil or the
like.

(1) Loosen the pump cover screw

the screw and the pump cover

(2) Remove the pump gasket

!1!1

!1.

!1!1

!4!4

!4 and remove

!4!4

!3!3

!3.

!3!3

!2!2

!2 and the diaphragm

!2!2

(3) Next, place the carburetor with the metering

side up and remove the metering cover screws

ii

i (4 screws).

ii

(4) Remove the metering cover

yy

ass'y

y and the gasket

yy

(5) Loosen the metering lever pin screw

remove the lever

ww

valve

w, etc.

ww

rr

r, pin

rr

(6) Remove the high-speed needle

idle needle

!0!0

!0.

!0!0

uu

u, the diaphragm

uu

tt

t.

tt

!8!8

!8, spring

!8!8

ee

e, needle

ee

oo

o and the

oo

!7!7

!7 and

!7!7

16

19

1

12

11

14

13

18
17

15

10

9

3

2

4

5

20

8c-3 INSPECTION PROCEDURE

(1) Wash the carburetor body with gasoline or the

like and blow it with compressed air.
However, make sure not to blow compressed
air into the check valve unit of the carburetor
equipped with primer pump.

(2) Check the gaskets for any deformation and/or

damage. If a gasket is deformed or damaged,
make sure to replace it with a new one.

(3) Make sure that the pump diaphragm

damaged and make sure that the inlet valve

and outlet valve are flat and not bent.
(4) Make sure that the metering diaphragm
(5) Check the throttle shaft
(6) Check the inlet screen

!9!9

!9 and the choke shaft

!9!9

qq

q for sticking of foreign matter. If there is any particle of foreign matter stuck

qq

on the inlet screen, wash it and blow it out with compressed air.
(7) Check the inlet needle valve

ww

w for abnormal wearing. If the inlet needle valve is worn, change it with

ww

a new one.

!1!1

!1 is not

!1!1

6

7

8

Fig. 8-8

yy

y is not damaged and that the plate is not bent.

yy

@0@0

@0 for smooth operation.

@0@0

-

59

-

8c-4 REASSEMBLY PROCEDURE

(1) Mount the inlet screen

(2) Mount the inlet needle valve

After mounting these parts, adjust the metering lever
larly careful when carrying out this adjustment, because the metering lever height depends on the
model.

(3) Next, mount the metering gasket

tighten the four cover screws

(4) Mount the high-speed needle

position and then adjust them to the specified opening by returning them counterclockwise from that
position. Be particularly careful when carrying out this adjustment, because the opening depends on
the model, both for the H and L positions.

(5) Next, mount the pump diaphragm

tighten the pump cover screw
Refer to the figure at the Fig. 8-8 for the procedure for mounting the parts of the carburetor.

By the way , when the idle needle
adjustment and when large amounts of foreign matter is stuck on the inlet screen
retor is disassembled, be sure to clean the interior of the fuel tank and change the tank filter.

qq

q on the body.

qq

ww

w, metering lever spring

ww

tt

t, metering diaphragm

tt

ii

i.

ii

oo

o and the idle needle

oo

!1!1

!1, pump gasket

!1!1

!4!4

!4.

!4!4

!0!0

!0 and the high-speed needle

!0!0

ee

e, metering lever

ee

rr

r position at the specified height. Be particu-

rr

yy

y and cover

yy

!0!0

!0, turn them gently clockwise to the fully shut

!0!0

!2!2

!2 and pump cover

!2!2

oo

o require a considerable amount of

oo

rr

r and other related parts.

rr

uu

u in this order and then

uu

!3!3

!3 in this order and then

!3!3

qq

q when the carbu-

qq

-

60

-

8c-5 DIAPHRAGM CARBURETOR ADJUSTMENT METHOD

In the first place, set the idle needle
and then carry out the adjustment according to the following steps of procedure.

!0!0

!0 and the high-speed needle

!0!0

oo

o at their standard return openings

oo

8c-5-1 IDLING ADJUSTMENT

(1) Start the engine and then carry out the adjustment of the idle adjust screw

at a speed slightly lower than the speed at which the clutch engages.
(2) Turn the idle needle

ates most smoothly.
(3) By means of the idle adjust screw

the specified idling speed.
(4) Next, turn the idle needle

!0!0

!0 clockwise/counterclockwise so as to find the position where the engine oper-

!0!0

!5!5

!5, adjust the engine at a speed approximately 500 r .p.m. higher than

!5!5

!0!0

!0 counterclockwise for the engine to operate at the specified idling speed.

!0!0

8c-5-2 HIGH-SPEED ADJUSTMENT

(1) Set the throttle valve

specified by the manufacturer.

1) If the engine speed is too high, turn the high-speed needle
engine revolution speed at the specified value.

2) If the engine speed is too low, turn the high-speed needle
revolution speed at the specified value.

!6!6

!6 at the fully open state and check whether the engine rotates at the speed

!6!6

oo

o counterclockwise so as to adjust the

oo

oo

o clockwise so as to adjust the engine

oo

!5!5

!5 for the engine to operate

!5!5

*The idle needle

the steps of procedure described above.
At that time, the adjustment is regarded as correct and normal if the needle return opening is within 1/2 of
the standard return opening.

!0!0

!0 and the high-speed needle

!0!0

oo

o are set at the correct adjustments through the execution of

oo

-

61

-

9. STARTING SYSTEM

9-1 RECOIL STARTER

Tools required: Driver, Pinchers (Pliers) and Protective Glasses

WARNING :
Before starting the disassembly, make sure to wear the protective glasses.

9-1-1 Disassembly Steps

(1) Setting off the spring power

-1 : Hold the starter knob and extract the starter
rope.

-2 : Extract the rope fully and hold the rope so
that the knob of the rope in the reel makes
a direct line with the rope guide.

-3 : Push and hold the reel with the thumbs of
both hands firmly so that the rope will not
be wound back. (Fig. 9-1)

-4 : Pull off the knot of the rope out of the reel,
unfasten the knot and pull it off to the di­rection of the starter knob. (2 persons re­quired)

-5 : By controlling the reel with the thumbs of
both hands, unwind the rope gently until
the rotation of the reel Stops.

WARNING :
The spring power is at its most when the rope is fully extracted. Therefore, do not abruptly

put off your hand nor loosen the pressure of your finger unintentionally.

Fig. 9-1

-

62

-

(2) Setting the attachments off (Fig. 9-2)

-1 : Fix the case and loosen the set-screw.

-2 : Put off the set-screw, the ratchet guide,
the friction spring and the ratchet in the
same order from above.

(3) Setting the reel off (Fig. 9-2)

-1 : Push the reel lightly so that it will not float
up. Move the reel clockwise and counter­clockwise about a quarter circle for sev­eral times until it moves smoothly.

-2 : Pull up the reel gradually and slowly and
put it off from the case.

-3 : In case the spring in the reel is close to
pop up, redo the steps of (3)-1 and (3)-2
again.

SET SCREW
RATCHET

GUIDE

FRICTION
SPRING

RATCHET

REEL

STARTER
CASE

WARNING :
Do not drop or shake the reel and put it

on a level table because there is a spring
set in the disassembled reel.

Disassembly is complete.

WARNING :
Before starting the assembly, make sure to wear the protective glasses.

9-1-2 Assembly Steps

(1) Setting the reel into the case.

-1 : Paste grease on the case. (Fig. 9-3)

-2 : Adjust the position of the inner end of the
spring, which is set in the reel. (Fig. 9-4)

Fig. 9-2

GREASE PASTING

-3 : Hold the reel so that the shaft/hook part
and the inner-end of the spring are hooked
together. Drop the reel gently from above
into the case.

-4 : Move the reel slightly counterclockwise and
make sure the spring is hooked.

-

63

SHAFT / HOOK PARTS

Fig. 9-3

THE POSITION THE END TOUCHES
THE RIB OF THE BEARING

Fig. 9-4

-

(2) Setting the attachments

-1: Set the ratchet into the reel. (Fig. 9-5)

THE RATCHET IS KEPT AT CLOSE-POSITION

Fig. 9-5

-2: Holding the ratchet, set the ratchet-guide
subassembly. (Fig. 9-6)

(3) Tightening the set-screw.

-1 : Push the ratchet-guide lightly by hand so
that the ratchet guide won't move and
tighten the set-screw.

SET SCREW

RATCHET
GUIDE

FRICTION
SPRING

RATCHET GUIDE SUB-ASSEMBLY

Fig. 9-6

ABOUT 200mm

FROM THE REEL

(4) Storing the spring-power.

-1 : Hold the case tight and using both hands,
wind up the reel counterclockwise 6 times.

-2 : Set the reel to keep the position, whereby
the rope hole of the reel and the rope guide
make a direct line. (Fig. 9-7)

Fig. 9-7

WARNING :
The spring power is at its most when the reel is being wound. Therefore, do not abruptly

put off your hand nor loosen the pressure of Your finger unintentionally.

-

64

-

(5) Setting the rope. (2 persons required)

-1 : Set the end of the rope through the rope
guide and the rope hole of the reel and pull
the end about 20 cm out of the reel.
(Fig. 9-7)

-2 : Fasten the end of the rope.

-3 : Put the rope into the reel, whereby make
sure that the rope will not float up.
(Fig. 9-9)

-4 : Hold the rope firmly with one hand at the
position about 50 cm from the rope guide
and keep the rope slightly pulled so that
the rope will not be wound in.

ABOUT
20mm

Fig. 9-8

-5 : Take your hand off the reel gently and re­lease the rope slowly checking the wind­ing power of the spring until the knob
reaches the rope guide.

Fig. 9-9

Assembly is complete.

(6) Test the operation of the recoil starter to see if the rope recoils satisfactorily and the ratchets extend

and retract properly. Mount the recoil starter to the engine.

(7) If the spring escapes from the reel when disassembling the recoil, hook the outer end of the spring

onto the notch of the reel and rewind the spring into the housing.

(8) Lubricate the rotating parts, sliding parts and spring with heat resistant grease before reassembling

the recoil and prior to long term storage.

-

65

-

10. TROUBLESHOOTING

The following three conditions must be fulfilled 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 difficult, e. g., a heavy load on the engine when it is about to start at low speed, and a
high back pressure due to a long exhaust pipe.

The most common causes of engine troubles are given below :

10-1 STARTING DIFFICULTIES
10-1-1 FUEL SYSTEM

(1) No gasoline in the fuel tank, or the fuel cock closed.
(2) The carburetor is not choked sufficiently especially when the engine is cold.
(3) Water, dust or gum in the gasoline interfering with the fuel flow to the carburetor.
(4) Inferior grade gasoline or poor quality gasoline not vaporized enough to produce the correct fuel-air

mixture.

(5) The carburetor needle valve is held open by dirt 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 a screwdriver or the

like.

(6) If the carburetor overflows, excessive fuel runs into the cylinder when starting the engine, making the

fuel-air mixture too rich to burn. If this happens, remove the spark plug, and turn the starting pulley a
few turns in order to let the rich fuel-air mixture out of the spark plug hole and into the atmosphere.
Keep the choke valve open during this operation.
Dry the spark plug well, screw it into place, and try to start again.

10-1-2 COMPRESSION SYSTEM

If starting difficulties and loss of power are not due to the fuel system or ignition system, the followings
must be checked for possible lack of compression.

(1) Engine inside is completely dried up because of a long period of storage.
(2) Loose or broken spark plug. This causes a hissing noise made by air/fuel mixture running out of

cylinder in compression stroke during cranking.

(3) Damaged head gasket or loose cylinder head. A similar hissing noise is produced during compres-

sion stroke.

-

66

-

(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 or gum on the valve stem.
b) If the piston rings are stuck on the piston, remove the piston and connecting rod from the engine.

Clean or replace the parts.

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 plug cable wet or soaked with oil.
(4) Spark plug dirty or wet.
(5) Spark plug electrode gap incorrect.
(6) Spark plug electrodes are connected or bridged.
(7) Incorrect spark timing.
(8) Proper connection of all wires.

10-2 ENGINE MISFIRES

(1) Incorrect spark plug electrode gap. Adjust it to anywhere between 0.7 and 0.8 mm.
(2) Ignition cable worn and leaking.
(3) Sparks weak.
(4) Ignition wire connections loose.
(5) Water in gasoline.
(6) Insufficient compression.

10-3 ENGINE STOPS

(1) Fuel tank empty. Water, dirt, gum, etc. in gasoline.
(2) Vapor lock, i. e., gasoline evaporating in the fuel lines due to overheating of the engine.
(3) 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 oil.
(6) Magneto or ignition coil faulty.

-

67

-

10-4 ENGINE OVERHEATS

(1) Crankcase oil level low. Add oil immediately.
(2) Spark timing incorrect.
(3) Low grade gasoline is used, or engine is overloaded.
(4) Cooling air circulation restricted.
(5) Cooling air path misdirected causing loss of cooling efficiency.
(6) Cylinder head cooling fins clogged up with dirt.
(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 on low-octane gasoline detonates due to heavy load at low speed.

10-5 ENGINE KNOCKS

(1) Poor quality gasoline.
(2) Engine operating under heavy load at low speed.
(3) Carbon or lead deposits in the cylinder head.
(4) Spark timing incorrect.
(5) Loose connecting rod bearing due to wear.
(6) Loose piston pin due to wear.
(7) See causes of engine overheat.

10-6 ENGINE BACKFIRES THROUGH CARBURETOR

(1) Water or dirt in gasoline, or low-grade gasoline.
(2) Intake valve stuck.
(3) Valves overheated, or hot carbon particles in the combustion chamber.
(4) Engine cold.

-

68

-

11. INSTALLATION

Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all
depend on the way in which the engine is installed. Review the following instructions carefully for install­ing the engine.

11-1 INSTALLING

When mounting the engine, carefully examine its position, the method of connecting it to a machine, the
foundation, and the method of supporting the engine.
When determining its mounting position, in particular, make sure that gasoline and oil can easily be
supplied and checked, the spark plug can easily be checked, the air cleaner can easily be serviced, and
that the oil can easily be discharged.

11-2 VENTILATION

Fresh air is necessary for cooling the engine and burning the fuel.
In the case the engine is operated under a hood or in a small room, temperature rise in the engine room
can cause vapor lock, oil deterioration, increased oil consumption, loss of power, piston seizure, shorter
engine life, etc., making it impossible to operate the engine properly . It is necessary, therefore, to provide
a duct or baffle to guide cooling air to the engine to prevent recirculation of the hot air used for engine
cooling, and temperature rise of the machine. Keep the engine room temperature below 50°C even in the
hottest period of the year.

11-3 EXHAUST GAS DISCHARGE

Exhaust gas is noxious. When operating the engine indoors, be sure to discharge the exhaust gas
outdoors. If a long exhaust pipe is used in such a case, the internal resistance increases causing loss of
engine power. Thus pipe inside diameter must be increased in proportion to exhaust pipe length.
Exhaust pipe : Less than 3 m long, pipe inside diameter 30 mm ,

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

11-4 POWER TRANSMISSION TO DRIVEN MACHINES
11-4-1 BELT DRIVE

Take the following notes into consideration.
* V-belts are preferable to flat belts.
* The driving shaft of the engine must be parallel to the driven shaft of the machine.
* The driving pulley of the engine must be in line with the driven pulley of the machine.
* Install the engine pulley as close to the engine as possible.
* If possible, span the belt horizontally.
* Disengage the load when starting the engine.
If no clutch is used, use a belt tension pulley or the like.

11-4-2 FLEXIBLE COUPLING

When using a flexible coupling, run out and misalignment between the driven shaft and engine shaft
must be minimized. Run out and misalignment tolerance are specified by the coupling manufacturer.

-

69

-

12. SERVICE DATA

“STD” in the following table is the parts dimension from the brand new engine or the spare parts.
Whereas, “Limit” shows the maximum allowance for the parts to be used on the engine.
If the measurement exceeds beyond the “Limit”, the part needs to be replaced and/or repaired.

12-1 CLEARANCE DATA AND LIMITS

METI

DAEHREDNILYC

ssentalF*

htdiwtcatnoctaesevlaV*

.aidedisniediugevlaV*

Unit : mm (in.)

D90HE

DTStimiL

NAHTSSEL

50.0
)200.0(

.XE.NI

1.1-8.0
)3340.0-5130.0(

815.5-005.5
)2712.0-5612.0(

1.0
)400.0(

0.2
)970.0(

56.5
)4222.0(

Unit : mm (in.)

D2-21HE

METI

DTStimiL

DAEHREDNILYC

ssentalF*

NAHTSSEL

50.0
)200.0(

htdiwtcatnoctaesevlaV*

.XE.NI

0.1-7.0

)930.0-820.0(

.aidedisniediugevlaV*

815.5-005.5
)2712.0-5612.0(

1.0
)400.0(

0.2
)970.0(

56.5
)4222.0(

-

70

-

Unit : mm (in.)

D90HED2-21HE

METI

DTStimiLDTStimiL

REDNILYC

.aidedisnI*

DTS

ts1

gnirober

ts2

gnirober

910.15-0.15
)900.2-800.2(

962.15-052.15

)5810.2-7710.2(

915.15-005.15

)3820.2-6720.2(

derobereboT

ehtnehw

ecnereffid

.xamneewteb

.nimdna

retemaidfo

1.0otdehcaer

.)400.0(

ottiD

--------------------

910.06-000.06
)0363.2-2263.2(

962.06-052.06
)8273.2-0273.2(

915.06-005.06
)6283.2-9183.2(

derobereboT

ehtnehw

ecnereffid

.xamneewteb

.nimdna

retemaidfo

1.0otdehcaer

.)400.0(

ottiD

--------------------

.gniroberretfassenidnuoR*

NAHTSSEL

10.0
)400.0(

--------------------

NAHTSSEL

10.0
)400.0(

--------------------

.gniroberretfayticirdnilyC*

NAHTSSEL

510.0
)6000.0(

--------------------

NAHTSSEL

510.0
)6000.0(

--------------------

NOTSIP

tsurhtnitrikstA(ezisnotsiP*

)noitcerid

DTS

s/ots1

s/odn2

99.05-79.05
)5700.2-7600.2(

42.15-22.15
)3710.2-5610.2(

94.15-74.15
)2720.2-4620.2(

88.05
)1300.2(

31.15
)3210.2(

83.15
)8220.2(

89.95-69.95
)4163.2-6063.2(

32.06-12.06
)3173.2-5073.2(

84.06-64.06
)1183.2-3083.2(

78.95
)1753.2(

21.06
)9663.2(

73.06
)8673.2(

-

71

-

Unit : mm (in.)

D90HED2-21HE

METI

DTStimiLDTStimiL

NOTSIP

ecnaraelcedisevoorggniR*

poT

dn2

gnirliO

080.0-530.0
)1300.0-4100.0(

080.0-530.0
)1300.0-4100.0(

560.0-010.0
)6200.0-4000.0(

51.0
)600.0(

51.0
)600.0(

51.0
)600.0(

570.0-030.0
)0300.0-2100.0(

570.0-030.0
)0300.0-2100.0(

570.0-020.0
)0300.0-8000.0(

51.0
)600.0(

51.0
)600.0(

51.0
)600.0(

elohnipnotsiP*

900.11-199.01
)4334.0-7234.0(

530.11
)4434.0(

200.31-199.21
)9115.0-5115.0(

530.31
)2315.0(

.aidedistuonipnotsiP*

000.11-299.01
)1334.0-8234.0(

069.01
)5134.0(

000.31-299.21
)8115.0-5115.0(

069.21
)2015.0(

dnanotsipneewtebecnaraelC*

trikstarednilyc

.aera

940.0-010.0
)9100.0-4000.0(

pagdnegnirnotsiP*

poT
dn2

gnirliO

poT

53.0-51.0
)410.0-600.0(

dn2

55.0-53.0
)220.0-410.0(

52.0-50.0
)010.0-200.0(

52.0
)010.0(

5.1
)1950.0(

5.1
)1950.0(

470.0-510.0
)9200.0-6000.0(

4.0-2.0
)610.0-800.0(

4.0-2.0
)610.0-800.0(

52.0
)010.0(

5.1
)1950.0(

5.1
)1950.0(

-

72

-

Unit : mm (in.)



D90HED2-21HE

METI

DTStimiLDTStimiL

DORGNITCENNOC

.aidedisnidnegiB*

310.02-000.02
)9787.0-4787.0(

dnegibneewtebecnaraelC*

nipknarcdna

1.02
)3197.0(

310.62-000.62
)1420.1-6320.1(

1.62
)6720.1(

360.0-730.0
)5200.0-5100.0(

2.0
)800.0(

640.0-020.0
)8100.0-8000.0(

2.0
)800.0(

.aidedisnidnellamS*

120.11-010.11
)9334.0-5334.0(

80.11
)2634.0(

120.31-010.31
)6215.0-2215.0(

80.31
)0515.0(

llamsneewtebecnaraelC*

nipnotsipdnadne

920.0-010.0
)1100.0-4000.0(

21.0
)7400.0(

920.0-010.0
)1100.0-4000.0(

21.0
)7400.0(

ecnaraelcedisdnegiB*

7.0-1.0
)820.0-400.0(

0.1
)040.0(

7.0-1.0
)820.0-400.0(

0.1
)040.0(

TFAHSKNARC

.aidedistuonipknarC*

369.91-059.91
)9587.0-4587.0(

58.91
)5187.0(

089.52-769.52
)8220.1-3220.1(

58.52
)7710.1(

.aidlanruoJ*

D1 D2

-

73

2D,1D

799.91-889.91
)3787.0-9687.0(

2D,1D

799.42-889.42
)1489.0-9389.0(

-

Unit : mm (in)

D90HED2-21HE

METI

DTStimiLDTStimiL

TFAHSMAC

).XEdna.NI(thgiehmaC*

5.81-3.81
)827.0-027.0(

51.81
)517.0(

8.92-6.92
)371.1-561.1(

54.92
)951.1(

.aidedistuolanruoJ*

epyt"D"

D

1

D

1

D

2

D

2

789.9-279.9
)2393.0-6293.0(

789.9-279.9
)2393.0-6293.0(

59.9
)7193.0(

59.9
)7193.0(

489.61-379.61
)7866.0-2866.0(

489.41-379.41
)9985.0-5985.0(

59.61
)3766.0(

59.41
)6885.0(

EVLAV

.aidedistuometsevlaV*

.NI

.XE

554.5-044.5
)8412.0-2412.0(

444.5-624.5
)3412.0-6312.0(

53.5
)6012.0(

53.5
)6012.0(

554.5-044.5
)8412.0-2412.0(

444.5-624.5
)3412.0-6312.0(

53.5
)6012.0(

53.5
)6012.0(

metsevlavneewtebecnaraelC*

evlavdna.aid

.ediug

.NI

.XE

870.0-540.0
)1300.0-8100.0(

290.0-650.0
)6300.0-2200.0(

3.0
)210.0(

3.0
)210.0(

870.0-540.0
)1300.0-8100.0(

290.0-650.0
)6300.0-2200.0(

3.0
)210.0(

3.0
)210.0(

ecnaraelcevlaV*

.XE/.NI

)dloc(

-

74

31.0-70.0
)1500.0-8200.0(

31.0-70.0
)1500.0-8200.0(

-

Unit : mm (in)

D90HED2-21HE

METI

DTStimiLDTStimiL

TEPPAT

.aidedistuometS*

579.7-069.7
)0413.0-4313.0(

579.7-069.7
)0413.0-4313.0(

.aidedisniediuG*

510.8-000.8
)6513.0-0513.0(

510.8-000.8
)6513.0-0513.0(

ecnaraelcediugteppaT*

550.0-520.0
)2200.0-0100.0(

550.0-520.0
)2200.0-0100.0(

HTGNELEERFGNIRPSEVLAV

7.62
)50.1(

--------------------

5.03
)2.1(

--------------------

).XEdna.NI(ELGNATAESEVLAV

)a(elgnarettucevlaV*

)b(htdiwtcatnocevlaV*

bb

a

09:a °

-

1.1-8.0:b

75

0.2

)340.0-130.0(

)970.0(

-

09:a °

0.1-7.0:b
)930.0-820.0(

0.2
)970.0(

12-2 TORQUE SPECIFICATIONS

SMETI

euqrotgninethgiT

N・・・・・mgK ・・・・・ mctf ・・・・・ .bl

daehrednilyC

stlob

dorgnitcennoC

stlobpac

)D90HE(6.02-6.81012-0912.51-7.31

)D2-21HE(0.62-0.32072-0320.03-0.71

)D90HE(8.7-9.508-067.5-3.4

)D2-21HE(0.11-8.8511-093.8-5.6

)D90HE(1.94-2.44005-0542.63-5.23

tunleehwylF

)D2-21HE(0.36-0.95056-0060.74-0.34

gniraebniaM

stlobrevoc

gulpkrapS

)D90HE(

gulpkrapS

)D2-21HE(

)D90HE(8.11-8.9021-0017.8-2.7

)D2-21HE(8.11-8.9021-0017.8-2.7

enoweN7.41-8.11051-0219.01-7.8

gninethgiteR5.42-6.22052-0321.81-6.61

enoweN7.41-8.11051-0219.01-7.8

gninethgiteR5.62-6.22072-0325.91-6.61

)D2-21HE(epipekatnI7.31-8.9041-0011.01-2.7

)D90HE(8.01-8.8011-090.8-5.6

tunrelffuM

)D2-21HE(5.62-5.22072-0325.91-5.61

12-3 OIL GRADE CHART

Comparison between oil viscosity and temparature

5W

10W

32

20W

#20

#30

10W-30

10W-40

0

10
50

20
68

30
86

Single

grade

Specified

Lubricant

Quality

Multi-

grade

-

20

-

4

-

10

14

Use oil classified as SE or higher.
Multi-grade oil tends to increase its consumption at high ambient temperature.

#40

40 °C

104 °F

-

76

-

13. MAINTENANCE AND STORAGE

The following maintenance jobs apply when the engine is operated correctly under normal conditions.
The indicated maintenance intervals are by no means guarantees for maintenance free 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 50 hours.

13-1 DAILY MAINTENANCE

SMETIECNANETNIAMSKRAMER

.enignemorfffahcdnatsudyawanaelC)1 .tsudotevitisnesyllaicepsesiegaknilronrevoG

,ynafI.metsysleufmorfegakaelleufkcehC)2

.strapyrassecenecalperrosrenetsafnethgiter

finethgiterdnaerawdrahesoolroftcepsnI)3

.yrassecen

.kramllufotddadnalevelliokcehC)4

.straprehtofoegakaerb

nitluserdnaffoemocyamstundnastlobesooL

13-2 INITIAL 20 HRS. MAINTENANCE

SMETIECNANETNIAMSKRAMER

.lioesacknarcecalpeR)1 .noitareponi-nurmorfegdulsevomeroT

13-3 EVERY 50 HRS. (10 DAYS) MAINTENANCE

SMETIECNANETNIAMSKRAMER

.lioesacknarcegnahC)1 .raewsnekciuqliodetanimatnoC

.renaelcrianaelC)2

.gulpkrapsnaelcdnakcehC)3 .repapyremehtiwhsiloproenilosagnihsaw,ytridfI

-

77

-

13-4 EVERY 100-200 HRS. (MONTHLY) MAINTENANCE

SMETIECNANETNIAMSKRAMER

.knatleufdnaretlifleufnaelC)1

.ffahcdnatridevomerdnametsysgnilooctcepsnI)2

13-5 EVERY 300 HRS. or YEARLY MAINTENANCE

SMETIECNANETNIAMSKRAMER

ecnaraelcevlavtsujdadnakcehC)1

13-6 EVERY 500

-

600 HRS. MAINTENANCE

SMETIECNANETNIAMSKRAMER

.daehrednilycmorfnobracevomeR)1

.roterubracnaelcdnaelbmessasiD)2

snifneewtebpunaelcdnagnisuohrewolbevomeR

.gnisuohdna

kcalsesuacrebmahcnoitsubmocnistisopednobraC

.rewopfo

13-7 EVERY 1000 HRS. (YEARLY) MAINTENANCE

SMETIECNANETNIAMSKRAMER

.enigneluahrevO)1

.raeyaecnosenilleufecalpeR)2 .egakaelleufybdesuacsdrazahdiovA

.straptcerrocdnanaelC

.strapyrassecenrehtodnasgnirnotsipecalpeR

13-8 ENGINE STORAGE

(1) Perform the above 13-1 and 13-2 maintenance jobs.
(2) Drain fuel from the fuel tank and carburetor float chamber.
(3) To prevent rust in the cylinder bore, apply oil through the spark plug hole and turn the crankshaft

several turns by hand. Reinstall the plug.
(4) Turn the starting pulley by hand and leave it where the resistance is the heaviest.
(5) Clean outside of the engine with oiled cloth.
(6) Put a plastic cover or the like over the engine and store the engine in dry place.

-

78

-

PRINTED IN THE USA