kymco mo x500 Instruction De Maintenance

. 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

• 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