85
CARBURETOR
Complaint Symptom and possible causes Remedy
Trouble with
starting.
1. Starter jet is clogged.
2. Air leaking from a joint between starter body and carburetor.
3. Air leaking from carburetor′s joint or vacuum hose joint.
4. Starter plunger is not operating properly.
Clean.
Check starter body and
carburetor for tightness, and
replace gasket.
Check and replace.
Check and replace.
Idling or
low-speed
troubles.
1. Pilot jet, pilot air jet are clogged or loose.
2. Air leaking from carburetor′s joint, vacuum pipe joint, or
starter.
3. Pilot outlet is clogged.
4. Starter plunger is not fully close.
Check and clean.
Check and replace.
Check and clean.
Check and replace.
Medium- or
high-speed
trouble.
1. Main jet or main air jet is clogged.
2. Needle jet is clogged.
3. Fuel level is improperly set.
4. Throttle valve is not operating properly.
5. Fuel filter is clogged.
Check and clean.
Check and clean.
Check and replace.
Check throttle valve for
operation.
Check and clean.
Overflow
and fuel
level
fluctuations.
1. Needle valve is worn or damaged.
2. Spring in needle valve is broken.
3. Float is not working properly.
4. Foreign matter has adhered to needle valve.
5. Fuel level is too high or low.
Replace.
Replace.
Check and adjust.
Clean.
Adjust and replace.
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