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5. FUEL SYSTEM PEOPLE 125/150
TROUBLESHOOTING
Engine is hard to start Misfiring during acceleration
· No spark at plug · Faulty ignition system
· Compression too low · Lean mixture
· No fuel to carburetor
-Clogged fuel filter Engine idles roughly, stalls or runs poorly
-Restricted fuel line · Clogged fuel system
-Faulty float valve · Ignition malfunction
-Incorrectly adjusted float level · Rich or lean mixture
· Engine flooded with fuel · Contaminated fuel
-Clogged air cleaner · Intake air leak
-Fuel overflowing · Incorrect idle speed
· Intake air leak · Incorrectly adjusted pilot screw
· Contaminated fuel · Clogged idle system or auto bystarter passages
· Faulty auto bystarter · Incorrectly adjusted float level
· Clogged idle system or auto bystarter passages
Lean mixture
Rich mixture · Clogged fuel jets
· Faulty auto bystarter · Faulty float valve
· Faulty float valve · Float level too low
· Float level too high · Clogged fuel system
· Clogged air jets · Intake air leak
· Dirty air cleaner · Faulty vacuum piston
· Flooded carburetor · Faulty throttle
Backfiring at deceleration
· Faulty air cut-off valve
· Lean mixture in idle system
5-3