kymco mo kxr 50 Service Manual

. FUEL SYSTEM

5-3

Mongoose/KXR 90/50

SPECIAL TOOL
Float level gauge

TROUBLESHOOTING

Engine cranks but won’t start

Engine lacks power

• No fuel in tank

• Clogged air cleaner

• No fuel to carburetor

• Faulty carburetor

• Cylinder flooded with fuel

• Faulty ignition system

• No spark at plug
• Clogged air cleaner

Lean mixture

• Intake air leak

• Clogged carburetor fuel jets

• Improper throttle operation

• Float level too low
• Intake air leak

Engine idles roughly, stalls or runs poorly

• Clogged fuel tank cap breather hole

• Faulty auto bystarter

• Bent, kinked or restricted fuel line

• Ignition malfunction
• Faulty carburetor

Rich mixture

• Poor quality fuel

• Float level too high

• Lean or rich mixture

• Clogged air jets

• Incorrect idle speed

• Clogged air cleaner

Misfiring during acceleration
• Faulty ignition system
• Faulty carburetor

Backfiring at deceleration
• Float level too low
• Incorrectly adjusted carburetor
• Faulty exhaust muffler