kymco mo movie125150 Instruction De Maintenance

Page de 14
5
. FUEL SYSTEM
5-2
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
• Improper vacuum piston operation
• Flooded carburetor
• Improper throttle operation
Backfiring at deceleration
• Improper air cut-off valve operation
• Lean mixture in idle system