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8 - 9MSERVICING INFORMATION
CARBURETTOR
Complaint
Trouble with starting
Idling or low-speed
trouble
Medium- or high-
speed trouble
Overflow and fuel
level fluctuations
RADIATOR
Complaint
Engine overheats
Engine overcools
Symptom and possible causes
1. Starter jet is clogged.
2. Starter pipe is clogged.
3. Air leaking from a joint between starter body
and carburettor.
4. Starter plunger is not operating properly.
1. Pilot jet is clogged or loose.
2. Air leaking from carburettor's S.I.P.C. hose or starter.
3. Pilot outlet or by-pass is clogged.
4. Starter plunger is not fully closed.
5. Imbalance of carburetors.
1. Main jet is clogged.
2. Jet needle is clogged.
3. Throttle valve is not operating properly.
4. Filter is clogged.
1. Needle valve is worn or damaged.
2. Float is not working properly.
3. Foreign matter has adhered to needle valve.
4. Fuel level is too high or low.
5. Clogged carburettor air vent pipe.
6. Spring in needle valve is broken.
Symptom and possible causes
1. Not enough cooling water.
2. Radiator core is clogged with dirt or trashes.
3. Defective thermostat, stuck in closed position.
4. Clogged water passages.
5. Air trapped in the cooling circuit.
6. Defective water pump.
7. Incorrect cooling water used.
1. Defective thermostat, stuck in full-open position.
2. Extremely cold weather.
Remedy
Clean.
Clean.
Check and retighten.
Repair.
Check and clean.
Check.
Check and clean.
Check and adjust.
Adjust the carburettors.
Check and clean.
Check and clean.
Check throttle valve
for operation.
Check and clean.
Replace.
Check and adjust.
Clean.
Adjust float height.
Clean.
Replace.
Remedy
Add.
Clean.
Replace.
Clean.
Bleed out air.
Replace.
Change coolant.
Replace.
Put on the radiator
cover.
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