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4
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TION 7-4
7-3 SERVICING INFORMATION
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CARBURETOR
Engine idles poorly.
1.
Out of adjustment tappet clearance.
Adjust.
2.
Poor seating of vaives.
Replace or repair.
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3. Defective valve guides.
Replace.
|
Trouble with
1.
Clogged starter jet.
lean:
4. Worn cam surface.
Replace.
Starting.
2. Clogged fuel pipe.
Clean:
sgt
5. Too wide spark plug gap.
Adjust or replace.
'
3. Starter plunger is not operating properly.
Check and adjust.
6, Defective ignition coil.
Replace.
4. Air leaking from carburetofs joint or vacuum
| Check and adjust.
7.
Defective pick-up coil or CDI unit.
Replace.
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hose joint.
'
8.
Out of adjustment in carburetor float-chamber
ree
5.
Not operation properly starter plunger.
Check and adjust or replace.
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fuel tevel,
6.
Air leaking from a joint between starter body
Clean and retighten.
9.
Spark plug too cold.
Replace by hot type plug.
i
and carburetor.
,
10. Clogged jets in carburetor.
Clean.
!
11. Defective generator.
Replace.
.
:
Idling or low-speed
1.
Clogged or loose pilot jet, pilot air jet.
Check and clean.
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trouble.
2.
Air leaking from carburetofs joint, vacuum hose
Check and replace.
Engine runs poorly
1.
Weakened valve springs.
Replace.
|
joint.
in high speed range.
2. Worn camshaft.
Replace.
3,
Clogged pilot outlet or bypass.
Check and clean.
3.
Valve timing out of adjustment.
Adjust.
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4.
Not fully closed starter plunger.
Check and adjust.
4.
Too narrow spark plug gap.
Adjust.
5.
Ignition not advanced sufficiently due to poorly};
Replace CDI unit.
Medium-or high
4.
Clogged main jet or main air jet.
Check and clean.
working timing advance circuit.
speed trouble.
2.
Clogged needle jet.
:
Check and clean. ;
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BA ATH
.
for operation.
8.
Defective ignition coil.
Replace.
3,
Not operating properly throttle valve.
Check throttle valve
ip
7.
Defective pick-up coil or CDI unit.
Replace.
4.
Clogged fuel filter.
Check and clean.
8.- Too low float-chamber fuel level.
Adjust.
5,
Clogged fuel tank air vent hose.
Check and clean.
9,
Clogged air cleaner element.
Clean.
—
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10. Clogged fuel hose, resulting in inadequate fuel | Clean and prime.
Overflow and fuel
4, Worn or damaged needle valve.
Replace.
SuPR erate
f
level fluctuations.
2.
Broken spring in needle valve.
Replace.
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3, Not working properly float.
Check and adjust.
Dirty or heavy
1. Too much engine oil in the engine.
Drain out excess oil.
|
4.
Foreign matter has adhered to needle valve.
Clean.
exhaust smoke.
2.
Worn piston rings or cylinder.
' | Replace.
:
&,
Too high or low fuel level.
Adjust float height.
3.
Worn valve guides.
:
Replace.
L
,
:
4.
Scored or scuffed cylinder wall.
Rebore or replace.
5. Worn valves stems.
Replace.
6.
Defective stem seals.
Replace.
7.
Worn oil ring side rails.
Replace.
Engine lacks power.
1,
Loss of tappet clearance.
Adjust.
2,
.Weakened valve springs.
Replace.
3.
Out of valve timing adjustment.
Adjust.
4.
Worn piston rings or cylinder.
Replace.
5.
Poor seating of valves.
Repair.
6.
Fouled spark plug.
Clean or replace.
|
7.
Incorrect spark plug.
Adjust or replace.
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8. Clogged jets in carburetor.
Clean.
ane
9.
Out of float-chamber fuel level adjustment.
Adjust.
:
:
10. Clogged air cleaner element.
Clean.
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11. Sucking air from intake pipe.
Retighten or replace.
12. Too much engine oil.
Drain out excess oil.
13. Worn camshaft.
Replace.
Engine overheats.
1.
Heavy carbon deposit on piston crown.
Clean.
2.
Not enough oil in the engine.
Add oil.
3.
Defective ail pump or clogged oil circuit.
Replace or clean.
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4.
Too low in float chambers fuel level.
Adjust.
5.
Sucking air from intake pipe.
Retighten or replace,
6.
Use incorrect engine oil. .
=
Change.
7.
Clogged air intake with dust.
Clean.
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