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FUEL
TROUBLESHOOTING
CAUSE
REMEDY
CARBURETOR
Erratic Idling
1. Incorrect idle needle valve adjustment
1. Adjust needle valves. If unable to improve idling, clean
throttle body. Replace worn needle valves.
2. Carburetor mounting is loose
2. Remove carburetor and governor. Check and replace
gaskets, if necessary. Make sure gaskets are installed
correctly. Tighten mounting nuts securely.
3. Idle tube or air bleed carbonized
3. Disassemble and clean carburetor. Blow carbon from air
bleed orifice and passageway with compressed air.
4. Idle discharge holes gummed or plugged
4. Disassemble and clean carburetor. Blow foreign matter
from the idle discharge holes and the secondary idle air
bleed.
5. Throttle body carbonized or throttle shaft
5. Disassemble and clean throttle body. Remove move
carbon.
6. Incorrect float level
6. Check and adjust float level as necessary.
Replace float if leaking.
7. Worn needle valve and seat
7. Install new needle valve and seat. Adjust float level.
8. Loose throttle body-to-main body screws
8. Install new gasket between main body and throttle body,
if necessary. Tighten throttle body mounting screws.
Carburetor Floods Or Leaks
1. Cracked main body
1. Replace main body. Make sure main body-to-throttle
body screws are tight.
2. Defective body gaskets
2. Replace gaskets. Tighten screws securely.
3. High float level
3. Check and adjust float level.
4. Worn needle valve and seat
4. Clean and check needle valve. If worn, replace valve
and seat. If not worn, check fuel pump pressure.
B-51

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