1G-12 Fuel System:
Diagnostic Information and Procedures
Carburetor Symptom Diagnosis
B649G11704001
Condition Possible cause Correction / Reference Item
Starting difficulty. Clogged starter jet. Clean.
Clogged starter jet passage. Clean.
Air leaking from joint between starter
body and carburetor.
Tighten, adjust or replace gasket.
Air leaking from carburetor joint or
vacuum hose joint.
Tighten or replace defective part.
Improperly working starter (enricher)
plunger.
Adjust.
Idling or low-speed
trouble.
Clogged or loose pilot jet. Clean or tighten.
Clogged or loose pilot air jet. Clean or tighten.
Air leaking from carburetor joint, vacuum
pipe joint, or starter.
Tighten or replace defective part.
Clogged pilot outlet port. Clean.
Clogged bypass port. Clean.
Starter (enricher) plunger not fully
closed.
Adjust.
Medium-or high speed
trouble
Clogged main jet. Clean.
Clogged main air jet. Clean.
Clogged needle jet. Clean.
Improperly working throttle valve. Adjust.
Clogged fuel filter. Clean or replace.
Overflow and fuel level
fluctuations.
Worn or damaged needle valve. Replace.
Broken needle valve spring. Replace.
Improperly working float. Adjust or replace.
Foreign matter on the needle valve. Clean or replace with needle valve seat.
Incorrect float chamber fuel level. Adjust float height.
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