KYMCO Bet & Win 125 User Manual page 150

13
. FUEL SYSTEM/CARBURETOR/
FUEL PUMP/ FUEL TANK
TROUBLESHOOTING
Engine does not start
• No fuel in tank
• Restricted fuel line
• Too much fuel getting to cylinder
• Clogged air cleaner
• Contaminated fuel
• Faulty fuel pump
Throttle does not open fully, so engine stalls
• Damaged vacuum piston diaphragm
• Clogged diaphragm hole
Lean mixture
• Clogged fuel jets
• Clogged fuel tank cap breather hole
• Clogged fuel filter
• 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
Engine idles roughly, stalls or runs poorly
• Incorrect idle speed
• Rich mixture
• Lean mixture
• Clogged air cleaner
• Intake air leak
• Contaminated fuel
• Faulty air-cut off valve
• Damaged vacuum tube and connectors
• Damaged carburetor insulator
Rich mixture
• Auto bystarter valve opens excessively
• Faulty float valve
• Float level too high
• Clogged air jets
• Auto bystarter valve set plate installed in
the wrong groove
•Clogged air cleaner
Bet & Win 125/150
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