Robin EC06 User manual

SERVICE
MANUAL
Models
EC06,EC08
1193s1 20

ROBIN AMERICA, INC.
ROBIN TO WISCONSIN ROBIN
ENGINE MODEL CROSS REFERENCE LIST
ROBIN
EY08
EY15
EY15V
EY20
EY2OV
EY23
EY28
EY3
5
EY40 -
EY45V
EY2
1
EY44
EY18-3
EY25
EY27
EH11
EH12
EH15
EH17
EH21
EH25
EH30
EH30V
EH34
EH34V
EH43V
EC13V
DY23
DY27
DY30
DY3
5
DY41
WISCONSIN ROBIN
SIDE VALVE
W 1-080
W1-145
W1-145V
W1-185
W1-185V
W1-230
W 1-280
W 1-340
W 1-390
Wl-45OV
EY21W
EY44W
EY18-3W
EY25W
EY27W
OVERHEAD VALVE
WO1-115
wo1-120
WO1-150
WO1-170
wo1-210
WOl-250
WO 1-300
WO1-300V
WO1-340
WO
1 -340V
WO 1-43OV
TWO CYCLE
WT1-125V
DIESEL
WRD 1-230
WRD 1-270
-1-300
WRD1-350
WRD1-410
0
0
0

CONTENTS
Section Title
Page
1 . SPECIFICATIONS .............................................. 1
2 . PERFORMANCE ................................................ 2
2-1
MaximumOutput ........ : ................................. 2
2-2
RatedContinuous Output .................................. ; . 2
2-3
MaximumTorque and FuelConsumption Ratio at MaximumOutput ........ 2
3 . FEATURES .................................................... 4
4 . DISASSEMBLY and REASSEMBLY .................................. 5
4-
1 PreparationsandSuggestions .................................. 5
4-2
Special Tools ............................................. 5
4-3
. DisassemblyProcedure ...................................... 6
4-4 ReassemblyProcedure ....................................... 9
5 . CONTACTBREAKERADJUSTINGPROCEDURE(EC06) .................. 13
6 . CARBURETORADJUSTMENT ..................................... 14
7 . GOVERNORADJUSTMENT ....................................... 15
8 . TROUBLE-SHOOTING ........................................... 16
8-1
StartingTrouble ........................................... 16
8-2
IdlingImproper ........................................... 19
8-3
OverheatingandEngine Knocking ............................... 19
8-4
Power Drop : ............................................. 19
8-5
Excessive FuelConsumption ................................... 20
8-6 Hunt.ing ................................................ 20
8-7 OtherTroubles .............................................. 20
9 . CHECKSand CORRECTIONS ...................................... 21
9- 1 EngineStandard CorrectionTable ............................... 22
9-2 Table of TighteningTorque ................................... 24
10 . MAINTENANCEand STORING ..................................... 25
10- 1 Daily ChecksandMaintenance .................................. 25
10-2
Every 50 HoursChecksandMaintenance : ......................... 25
10-3
Every 150 HoursChecksandMaintenance .......................... 25
10-4
Yearly ChecksandMaintenance ................................ 25
10-5
Preparationfor LongAbeyance ................................. 25

Fuel Tank Cap
Recoil Starter
ECOGD
n
Spark Plug
Muffler Cover
overnorLever
Engine
Base (optional)
Governor Chamber
(Engine base
is opti onal.)
ECOGB

Model ECOGD ECOGB ECOID ECO~B
Air-Cooled, 2-Cycle, Vertical, PistonValve Type, Single Cylinder Gasoline Engine
Bore
x Stroke 44mmx40mm I I. 50 mm x 40 mm
PistonDisplacement .60.8 cc78.5cc
ContinuousRatedOutput (HP/rpm) 1.6/3600,1.9/4500 11.6/1440,1.9/1800
I 2.2/4500 1 2.2/1800
MaximumOutput (HP/rpm) 2.5/5000
.. I 2.5/2000 I 3.3/5500 1 3-3/2200
~~
MaximumTorque (kg-m/rpm)
I 0.38/3700 . 0.95/1480. 0.51/3600 1.27li440
.' Counterclockwise as viewedfrom P.T.O. ShaftSideDirection of Rotation .
Lubrication
~
Fuel-lubricantMixtureType
~~
~~
Lubricant
I 2-Cycle EngineOil
Carburetor'
I .
_-
Fuel Gasoline-lubricantMixture (20- 25: 1)
..
FloatType ..
Fuel ConsumptionRatio(gr/HP-h) 390
at RatedContinuous Output380 at RatedContinuous Output
Fuel Feed Gravity Type
FuelTank Capacity1.5 iitres
~ ~~~
L.
IgnitionSystem
~ ~~
Contactless MagnetoType
FlywheelMagneto Type
(Contactless Magneto Type is
also available.)
Spark Plug NGKB6HS
I NGKB7HS
'StartingSystem
.-
I RecoilStarter
Speed Governor CentrifugalFlyweightType
Speed ReductionSystem
- 1/2.5 Reduction 1/2.5 Reduction
-.
Gear Gear
ReductionChamber Oil
.. - SAE#30 - - SAE#30.
.AirCleaner Semi-wetType
Dry Weight
I
Length 256
mm
285 mm 256 mm 285 mm
Width 307 mm
307 mm .
307 mm
307 mm'
Height 287 mm 287
mm
287 mm 287 mrn
"
Dimensions

2. PERFORMANCE
2-1 MAXIMUM OUTPUT 0
1
Maximum output refers to the standard power produced by a sufficiently run-in engine with the carburetor
throttle valve fully open.
A new engine cannotalways deliver maximum output power because it has not been well run in.
2-2 RATEDCONTINUOUSOUTPUT
ri/
The term refers to a continuous output most ideal toengine life and fuel consumption under governorcon-
trol.
In combining your ROBIN engine with aload, design your driving system so that the engine may be
continuously used at a load level not exceeding the rated continuous output.
2-3 MAXIMUMTORQUE and FUELCONSUMPTION RATIO at MAXIMUM OUTPUT
Maximum torque refers to thedriving torque of the drive shaft when the engine is driving the external load
at maximum output.
The term fuel consumption ratio at maximum output refers
to the fuel consumption ratio when the engine
is operation at the maximum output.
HP
I
w
2
P
6
+
PERFORMANCE CURVE
MODEL ECOGD/B
( 1 for B type
(1 200) (1 600) (2000)
--W r.p.m.
Revolution
-2-

HP
PERFORMANCE CURVE .
MODEL EC08D/B
( ) for B type
kg-m
( 1.25)
W
(0.75)
gr/H P- h
(1 200) (1 600) (2000)
--* r.p.m.
Revolution
-3-

3. FEATURES
1.
2.
3.
4.
5.
6.
7.
8.
9.
IO.
Compact, lightweight, high-powered enginewith reliable operation alsoin the low speed range
Extremely simple inconstruction, trouble-free, and veryeasy
to use
Quiet running engine using a lined aluminium cylinder
(EC06)
Equipped withT.C.I. (Transistor Circuit Ignition)
So durable that theengine canstand hoursof tough work.
Needle bearings are used for the crank pins and piston bearings toenable theengine to withstand high-
speed operation underheavy load.
The carburetor works at inclinations of up to aboaut
30" so that the engine can operate until the fuel
overflows fromits air vent.
The recoil starter permitseasy starting.
Useful in a wide rangeof applications
A direct-coupled, reduction type engine, and other types that differ from the standard models in drive
shaft dimensions and shape arealso available.
The all-speed governor operates at any engine speed.
The desiredrpm. can be obtained by simply moving the control lever, and it remains constant evenif
the load changes.
Resistant to vibration (EC08)
Manufacturers of rammers and plates (machines
for compacting earth by vibration) around the world
are using theseROBIN engines.
-4-

4. DISASSEMBLY and REASSEMBLY
4-1 PRE-PARATIONS and SUGGESTIONS
.Disassembly
-1) In"disassembling,remember thelocation of eachpart so that the disassembledpartsEcanbe reassembled . I
2) Carefully handle the gaskets because they can easily break.
3) Temporarily fasten disassembled parts in their original positionsto prevent them from missing and wrong
4) Carefully handle disassembled parts and clean them with kerosene.
5) Use thecorrect tools in the correct way.
6) Items necessary for disassembly and reassembly ..
...
in theright way. Attachtags tothose partswhich might be mistaken for others.
..
,.
reassembly.
a.'Work benchb. Kerosene
pan I c.Disassemblytools d. Kerosene or gasoline
e.
sandpaper, spatula,wastecloth 1 -
1.
7) Be sure to discharge the'fuel and oil before disassembling.
..
.Reassembly
1) Use new packing and gaskets in reassemblingthe engine.
2) Clean the parts withfresh gasoline,and blow them dry withcompressed air before reassembling.
3) Apply 2-cycle oil to the rotary andsliding parts.
4) Keep the.parts free of dust during reassembly.
5) Each'time a set of main parts is installed, manually'turnit and check for smoothness andnoise.'
6) After reassemblingthe engine, turn it manually and check for abnormalities and looseness. .
Tighten.the bolts, nuts, andscrews.with the specified torques.
m
4-2 SPECIALTOOLS
..
. .%
" .. Flywheel Pulley
Fig. 1
..

4-3 DISASSEMBLY PROCEDURE
4-3- 1 DISCHARGINGFUEL
Discharge the fuel from thefuel tank.
4-3-2 FUEL TANK
1) Disconnect the pipe connecting the fuel filter to
2) Removethe fuel tank from the cylinder and fan
the carburetor at the carburetor end.
cover.
4-3-3 STOP BUTTON CORD
Disconnect the cord from the socketterminal.
4-3-4 FAN COVER
Remove thebolts andthenthe fancover together
with the stop button.
Note: The rubber baffle comes off simultaneously.
4-3-5 CYLINDERCOVER
Remove the bolts and then the cylindercover.
4-3-6 STARTER PULLEY
Remove theboltsandthenthestarter pulley from
the flywheel.
4-3- 7 MAGNETO and FLYWHEEL
Remove the nut and take theflywheelfrom the front
end of the crankshaftusing the flywheel puller.
(See Fig.
2.)
Fig. 2
4-3-8 WOODRUFF KEY
4-3-9 CONTACT BREAKER,CAPACITOR,
IGNITION COIL
[Point
Type for EC06 (SeeFig. 3A.)] \/
n
1) Remove the screws that fasten the capacitor and
point cover together, and remove the point cover
from the crankcase.
2) Remove thesocket typeterminal andmounting
screws,remove thecapacitor,contactbreaker,
andignition coilfrom thecrankcase in thisorder.
Note: Exercisecareinremovingthe grommet
from the crankcase.
Ignition Coil
Breaker
Point Cover
Fig. 3A
Hold a screwdriver withits flat part on the woodruff
key, and lightly strike the screwdriver to remove the
key with a mallet.
-6-

[ T. C. I. (Transistor Control Ignition) magneto]
1 ) Features
The T.C.I. magneto completely solves the prob-
lems with the conventional point type magneto,
that
is, stains, burns, rusting during long storage,
ignition timing deviation dueto mechanical wear,
etc.
2) Construction
The components
of the magnetoassembly are as
shown inFig.
3B. The main parts of the magneto
are explained.
Flywheel Complete
T.C.I. Unit ./
Generating Assembly
~
Fig. 3B
FLYWHEEL COMPLETE
The FLYWHEEL COMPLETE hasperma-
nent-magnets
so thattherotationof these
magnets generates anAC electromotive force
in the primarycoil
of the generating assem-
bly.
GENERATING ASSEMBLY
The GENERATING ASSEMBLY consists
of
the primary coil and secondary coil. The ro-
tation
of the FLYWHEEL COMPLETE gen-
erates a voltage in the primarycoil and feeds
a current. At the same time a high voltage
is
induced in the secondary coil. Thishigh volt-
age causes the sparkplug
to spark.
T.C.I. UNIT
TheT.C.I.
UNIT consists maily of anSCR
and other semi-conductor parts. Itsenses the
primarycurrentwaveformgeneratedinthe
GENERATING ASSEMBLY,
and switches
the transistor
to cut off the primary coil cur-
rent.
This abrupt currentchange causes a high volt-
age to be induced in the secondarycoil.
3) Wiring diagram
r
Prim r Wir
Spark
- T.C.I. Unit
Plug
* Assembly
Fig. 3C
-7-

4-3- 10 CARBURETOR,GOVERNORLEVER
1)Remove thenutandthenthecarburetorfrom
2) Loosen thenut,and remove the governor lever
3) Remove the governorspring fromthe governor
the cylinder.
from thegovernor shaft.
lever.
c
L
4-3- 1 1 SPARK PLUG
Remove the spark plugusing a box wrench.
4-3 - 12 MUFFLER (MUFFLER COVER)
Carburetor
GovernorLever
Fig. 4
Remove the nuts, and then the muffler from thecyl-
inder. (See Fig.
5.)
Note: Keep themuffler cover on.
Nut p/
Muffler Cover
4- 3 - 13 REDUCTION GEAR (Type B only)
1) Remove the drainplug from the reductioncham-
2) Remove thereductionchamber cover fromthe
3) Remove thenuts,and pull thereductionpinion
ber to discharge the
oil.
engine.
out from the crankshaft.
(See Fig.
6.)
4) Remove the woodruff key.
Reduction Cover eduction Chamber
%@" %
'Drain Plug
Woodruff Key
Reduction Pinion
Fig. 6
4-3-14 CYLINDER
Remove the nuts, and carefully lift the cylinder off,
exercisingcare notto damage thecontact surfaces
of the piston and cylinder.(See Fig. 7.)
Note: Hold the piston when the cylinder is lifted to
a certainheight from the crankcase, and raise the
cylinder off the piston. Damage to them can be pre-
vented this way.
Cylinder
rankcase
n
\
fig. 5
-8-
Fig. 7

4-3- 15 DIVIDING CRANKCASE
Remove the bolts, andcarefully strike thecrankcase
with a mallettopart it. (See Fig.
8.)
Clean the divided crankcase with gasoline, and apply
engine oil to the bearing, and grease to the oilseal
lips.
Note: Be careful not todamage thecrankcasejoint.
\ I
Fro"; Crankcase
Crankshaft
Rear Crankcase
Fig. 8
4-3- 16 PISTON, PISTON PIN, NEEDLE BEAR-
ING, and CLIPS (See Fig.
9.)
Remove the clips. With a ironrod 10 to 1 1mmin
diameteronthepistonpin, lightlystrike itwith a
plasticHammer to remove thepistonpin. Pull out
the iron rod, andremove the piston andneedle bear-
ing.
Note: Be careful not todamage the.pistonpinhole
in the piston.
4-4 REASSEMBLY PROCEDURE
4-4-1 CRANKSHAFT COMPLETE and PISTON
Applyengine oilto theneedle bearing,and fit
it onto
the small end of the connecting rod. With the mark
M on the piston head on the flywheel (magneto) side,
fit the piston head on the piston. Applyengine oil to
the piston, and lightly strike the pin into the piston
with a mallet (until the pin
is poisitoned inward of
the clip grooves). Then fit two clips intothe clip
grooves. (See Fig.
10 .)
Note: Be careful not todamage the piston pin hole
in the piston. Be sure to use new clips. Themark
M
must be in thedirection of the front end of the
crankshaft.
Fig.
-10 . I
4-4-2 INSERTINGCRANKSHAFTINTO
CRANKCASE
Place therear half
of the crankcase on thework
bench securely, andinsertthecrankshaftintothe
crankcase bearing by hand.
Note: See that the frontandrear halvesof the crank-
case can
be reassembledproperly.
4-4-3 CRANKCASE REASSEMBLY (See Fig. 1 1.)
Wipe the joint surfaces of the front and rear halves
of the crankcase until oil is completelyremoved
fromthem,apply asealant
to them,andwiththe
dowels in line with their matchingholes, reassemble
the crankcase.
Note: Exercisegoodcarenot todamage thegovernor
sleeve, yoke assembly, and oil seals.Keep the joint
surfacesofthe frontand rear halvesof the crankcase
parallel to each other
in pressing them together into
the originalassembly.
-9-

Crankshaft I
Rear Crankcase
\ Governor Yo
I Governors'
E
1 ke
Front Crankcase
I 'I
Fig. 1 1
4-4-4 CRANKCASE
Tighten thebolts with spring washers andplain wash-
ers.
Note: Tightening torque . . . . . . 1 10 f 20 kg-cm
4-4-5 CYLINDER REASSEMBLY (See Fig. 12.)
Replace the old cylinder gasket with a new one, ap-
ply oilto thecylinder and piston, make sure that the
piston
rings and cylinder are positionedcorrectly,
and install thecylinder.
Note: Be careful not to let the gasketslide out of
place.
Cylinder
Fig. 12
4-4-6 CYLINDER TIGHTENING
Tighten the nuts with springwashers and plain wash-
ers.
Note: Tigtening torque. . .. . . . . 1 10 k IO kg-crn
Tightenall the four nuts evenly.
4-4-7 SPARK PLUG
Tighten the sparkplug into thecylinder.
Note: Tighteningtorque. . .. .. . 275 +25 kg-crn
4-4-8 GOVERNOR LEVER
Tightenthe governor leverto thegovernor shaft with
thenut.(Fortheadjustingprocedure,refertothe
section on governor adjustments.)
4-4-9 GOVERNORSPRING
Hook the governor spring to the governor lever and
governor. (See Fig.
13.)
Note: Be careful of thehookingpositions.
/
Governor Spring
(attached
to bottom)
GovernorLever
n
Fig. 13
4-4- 10 CARBURETOR
Replacethe oldgasket with
a newone,andinstall
the carburetor.
Note: Tightening torque . . . . .. . . 80 2 IO kg-cm
4-4- 11MUFFLER(MUFFLERCOVER)
Replace the oldgasket with a new one, and tighten
the mufflerto thecylinder.
Note: Tighteningtorque .. . .. . . . 80 f IO kg-cm
4-4- 12 WOODRUFF KEY
Drive the woodruff key into the keywayinthe crank-
shaft using a mallet.
Note: Drive itparallel to theshaft axis.
4-4- 13 IGNITION COIL TEMPORARY
n
TIGHTENING
With the high-tensioncord (to be connected
to the
spark plug) up, temporarily tighten the ignition
coil.
- 10 -

4-4- 14 CONTACT BREAKER(POINT)
CAPACITOR (EC06)
Installthecontact breakerby inserting'itsshaftinto
thematchinghole in thercrankcase. Pass thecord
under the capacitor into the cord hole in the crank-
case.
Temporarily tighten the capacitor.
4-4- 15 IGNITION TIMING CHECK (EC06)
Temporarily install the flywheel, and check and ad-
just theignition timing.
(For ignition timing adjustment, refer to the section
on contact breaker adjusting procedure.)
Note: Ignition timing ............... 23" k2'
4-4-16POINT COVER (EC06) , ,'
Remove the flywheel, fit the point-to-capacitorlead
into the crankcase groove, and install the.point cov-
er. (See Fig. 14.)
Tighten the temporarily tightened capacitorsecurely.
Note: Tighteningtorque ......... 25 f 2 kg-cm
Lead Wiring Method
Crankcase Groove
II -./ I
//
Capacitor Lead
Primary Wire
Turn primarywire onceand
w
pull itin direction A.
I
I
Capacitor lead is above
primary wire here.
Fig. 14
4-4- 17 FLYWHEEL (MAGNETO)'
Install the flywheel on the crankshaft by tightening
the nut'withplain and spring washers.
Note: Completely remove oil from the tapered por-
tion. Tighteningtorque
....... 400 k 20 kg-cm
4-4- 18 IGNITIONCOIL
Adjusttheair gap withasearcher,andtightenthe
ignition coil with plain and spring washers. (See Fig.
15.)
Note: Air gap. .... .0.5 foe. mm
Tighteningtorque
.......... 50 f5 kg-cm
Fig.
15
4-4-,19STARTER PULLEY
Tightenthe starter pulley
to the flywheelwith the
bolt. (Use plain and spring washers.)
Note: Tighteningtorque ........ 90 f IO kg-cm
4-4-20 FANCOVER,STOP BUTTON,
GROMMET (See Figs. 16 and
17.)
Installthestopbuttonwith lockwasher on the fan
cover.Insert the high-tensioncord intothe grom-
met,and installbafflerubberon the fancover. Fit
the grommet into thefan cover grooveand, with the
tip
of therubber baffle attheround boss in the
crankcase,fasten the fan cover on the crankcase
with the bolt.
Note: Be careful not to pinch the stop button cord
betweenthe crankcase and
fan cover. Also exercise
care not to drop the rubber baffle during fancover
reassembly.
.L
Tightening torque ........ 90 2 10 kg-cm
-11 -

(Position in Model Dl
Fig. 16
Buffle Rubber installingMethod
Whichever type, D or B, your engine is, be careful of
the punched markson the crankcase in reassembing.
Wider endup
PunchedMark (case)
Flatsurface inside
Baffle Rubber
Type
D
Note: Install right of themagneto.
Wider end up
PunchedMark (case)
Flatsurface inside
Baffle Rubber
Type
, .Note: Install left of themagneto.
4-4-21 CYLINDERCOVER
Insert the cylinder covertips into thematching slots
in the crankcase, andtightenthecylindercoveron
the cylinder. (See Fig. 18.)
Note: Insert the cylinder cover tips in to the slots on
both sides.
Tightening torque
Cylinder Cover
. . . . . . . . 80 f 10 kg-cm
InstallingMethod
Crankcase
Fig. 18
4-4-22 FUEL TANK
Insertthe fuelpipe intothecarburetor, clamp it,
and mount the fuel tank on the cylinder
fan cover.
Note: Tightening torque .. . . .. . . 90 f 10 kg-cm
f7
,’
fig. 17
- 12 -

5. CONTACT BREAKER ADJUSTINGPROCEDURE(EC06)
1) Remove the fancover.
2) Remove the starter pulley.
3) Remove the flywheel.
4) Loosen thecapacitor screws.
5) Remove the point cover.
6) Removecarbonand other foreignparticlesfrom thepoint,polish-thecontact surfacewithsandpaper
7) Temporarily fasten the flywheel, bring the mark F in line with the matching mark on the crank case, and
8) Now, in this state,adjust the contact breaker as shown below. (See Fig. 19.)
No.400 orequivalent, and wipe dirt off with a cloth.
remove the flywheel, exercisingcare not to turn it.
Mark
Fig. 19
Note: If the points are open in the sate illustratedabove, ignition timinggoes wrong to a serious extent.
Be carefulnot tomove thepoints especially when tigtenirig the breakermount screw.
Ignition timing
. ... . . . . .. . . . .. . . .. . .I. .. . . . .. 23" *2''
a). Loosen the breaker mounting screw.
b) Push the breakerin the arrow direction
to a position just before the points begin to open (usinga
c) After the point adjustment,install the pointcover, capacitor, magneto, and fan cover in this order.
timing tester, for example), and tighten'the breaker mounting screw.
- 13 -

6. CARBURETORADJUSTMENT
The carburetor is carefuuly adjusted in the factory before shipment.Never attempt toadjust it exceptwhen
necessary.
1) Idling Adjustment (See Fig.
20.)
Move the governorlever to thelowest speedposi-
tion
(so thatthe carburetorthrottle valve fully
closes), and check that theengine idles quiet and
smooth. This is the idealidlingcondition. Nor-
mally, the engine is set to anidling speed of 1600
k 100 rpm, for which thefollowing two methods
may be used.
a) Low-speed stopperscrew
Engine speed increases if the low-speed stop-
per screw
on the carburetor is turned clock-
wise, ordecreasesifit is turned counterclock-
wise.
b) Pilot screw (Do not turn it except
when necessary.)
When thepilot screw
is turned clockwise,
the fuel-air mixture decreases and theengine
slowsdown. Ifthe pilotscrew is turned coun-
terclockwise, the fuel-air mixture increases
to raise engine speed.The normal position
of
the pilotscrew is one turn anda quarterback
from theclockwise extremity.
2) Maximum Speed Adjustment(See Fig. 2 1.)
Thestandardmaximumspeed is 5000 rpmfor
EC06, or 5500 rpm forEC08.
Move the governor lever tothe highest speed
position,adjustthecrankshaftrpmto
5000
(EC06)or 5500 (EC08)withthe high-speed
stopper bolt,and lock the bolt with the nut.
Fig. 20
Governor Lever
LowSpeed
n
I
Fig. 21
- 14 -

7. GOVERNOR ADJUSTMENT
Fully open the carburetor butterfly valve, fasten the
governor lever, turn thegovernor shaft fully counter-
clockwise, and fasten the governor lever on the
gov-
ernor shaft with the nut.(See Figs. 22 and,23.)
Fig. 22
Governor Rod Spri Governor Rod
Throttle Lever Carburetor
Governor Lever
Crankshaft eed
Governor
Sleev
Control Lever
Fig. 23
Stopper Bolt
- 15 -

8. TROUBLE-SHOOTING
The following three conditions must be satisfiedfor satisfactory enginestart:
1) The cylinder filled with a proper fuel-air mixture
2) An appropriate compression in the cylinder
3) Good spark at correct time toignite mixture
The engine cannot be started unless these three conditions are met. There are also other factorswhich make
engine start difficult, e.g., a heavy load on the engine when it
is about to start atlow speed, and a high back
pressure dueto a long exhaust pipe,just tosay a few,
The most common causes of engine troubles aregiven below:
8-1 STARTING TROUBLE
Trouble
No or little
spark
Cause
I
Remedy
Spark plug defective
I
(1) If spark plug is dirty, clean it well with gasoline
or polish it with sand-paper.Remove foreign
matter if any.
(2) Adjust spark gap to 0.6 - 0.7 mm.
(3) If spark plug hasfaulty instulation due to
breakage, replay it with anew one.
High-tension cable together.
defective If defective, replace the cable and ignition coil
Contact breaker
defective
(1) If points are rough, polish them with sand-
paper
No. 400.
(2) If point gap is wrong, loosen contact mount
screw, and adjust it to
0.35 ? 0.05 mm.
Also adjust ignition timing if possible.
(3) If ignition timing is wrong, adjust it to
23' f 2' before top dead center.
(4) If breaker has faulty insulation, replace
the breaker with
a new one.
(5) If capacitor is defective, replace it with
a new one.
Preventive hints
(1) Use a spark plug of the speci-
fied heat value.
Do not use
low-quality oil. Clean the air
cleaner to prevent dust from
entering.
center pole or forcibly twist
it in adjusting spark gap.
Otherwise, insulation breaks
down.
(2) Be carefid not tostrike the
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