Sym GTS 250 Service Manual page 50

Trouble Diagnosis
Poor engine start
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 chock
Malfunction of throttle operation
Stall after started
Malfunction of carburetor chock
Incorrect ignition timing
Malfunction of carburetor
Dirty engine oil
Air existing in intake system
Incorrect idle speed
Rough idle
Malfunction of ignition system
Incorrect idle speed
Malfunction of carburetor
Dirty fuel
Intermittently misfire as acceleration
Malfunction of ignition system
Late ignition timing
Malfunction of ignition system
Malfunction of carburetor
Power insufficiency and fuel consuming
Fuel system clogged
Malfunction of ignition system
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Mixture too lean
Clogged fuel injector
Vacuum piston stick and 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 existing in intake system
Mixture too rich
Clogged air injector
Malfunction of float valve
Fuel level too high in float chamber
Malfunction of carburetor chock
Dirty air cleaner
4. Fuel System
4-3