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SERVICE MANUAL
Fuel System
Troubleshooting:
Engine starting poorly
No fuel in fuel tank
Clogged fuel tube
• Too much fuel in cylinder • No spark from spark plug (malfunction of ignition system)
• Clogged air cleaner • Malfunction of carburetor choke
• Malfunction of throttle operation
Stall after started
• Malfunction of carburetor choke • Incorrect ignition timing
• Malfunction of carburetor • Dirty engine oil
• Air leak in intake system • Incorrect idle speed
Rough Idle
• Malfunction of ignition system • Incorrect idle speed
• Malfunction of carburetor • Dirty fuel
Intermittently misfire under acceleration
• Malfunction of ignition system
Late ignition timing
• Malfunction of ignition system • Malfunction of carburetor
Insufficient power or fuel economy
• Fuel system clogged • Malfunction of ignition system
Mixture too lean
• Clogged fuel injector • Vacuum piston stuck closed
• Malfunction of float valve • Fuel level too low in float chamber
• Clogged fuel tank cap vent • Clogged fuel filter
• Obstructed fuel pipe • Clogged air vent hose
• Air leak in intake system
Mixture too rich
• Clogged air injector • Malfunction of float valve
• Fuel level too high in float chamber • Malfunction of carburetor choke
• Dirty air cleaner
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