KYMCO XCITING 500, Service Manual

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5
. FUEL SYSTEM/FUEL PUMP
/FUEL TANK/CARBURETOR
5-4
XCITING 500
TROUBLESHOOTING
Engine does not start Engine idles roughly, stalls or runs poorly
•
No fuel in tank
•
Incorrect idle speed
•
Restricted fuel line
•
Rich mixture
•
Too much fuel getting to cylinder
•
Lean mixture
•
Clogged air cleaner
•
Clogged air cleaner
•
Contaminated fuel
•
Intake air leak
•
Faulty fuel pump
•
Contaminated fuel
•
Faulty air-cut off valve
•
Damaged vacuum tube and connectors
•
Damaged carburetor insulator
Throttle does not open fully, so engine stalls Rich mixture
•
Damaged vacuum piston diaphragm
•
Automatic valve opens excessively
•
Clogged diaphragm hole
•
Faulty float valve
•
Float level too high
Lean mixture
•
Clogged air jets
•
Clogged fuel jets
•
Automatic choke valve set plate installed in
•
Clogged fuel tank cap breather hole
the wrong groove
•
Clogged fuel filter
•
Clogged air cleaner
•
Bent, kinked or restricted fuel line
•
Faulty float valve
•
Float level too low
•
Faulty fuel pump or insufficient output
Engine is hard to start
•
No fuel in tank
•
Restricted fuel line
•
Clogged fuel strainer
•
Faulty fuel pump
•
Broken or clogged vacuum tube
•
Faulty or clogged charcoal canister
Lean mixture
•
Clogged charcoal canister
•
Bent, kinked or restricted fuel line
•
Clogged fuel strainer
•
Float level too low