5-2
FUEL SYSTEM
TROUBLESHOOTING
The vehicle does not start.
● No gasoline in fuel tank.
● Fuel is not coming out of carburetor.
● Too much fuel is flowing into cylinder.
● No spark emitted from spark plug.
● Air cleaner is blocked.
● Suction system is experiencing secondary intake of air.
● Using low quality gasoline.
● Starter is damaged.
● Throttle cable is working improperly.
● Fuel tank is functioning improperly.
Idle is unstable and engine turns off after starting.
● Starter is damaged.
● Ignition system is damaged.
● Using low quality gasoline.
● Suction system is experiencing secondary intake of air.
● Idle is adjusted improperly.
● Air screw is adjusted improperly.
● Compression pressure is low.
● Air/Fuel mixture is either too lean or rich.
● Carburetor is blocked.
Mis-firing occurs when driving at high speeds.
● Ignition system is damaged.
● Mixture is too lean.
Back firing
● Ignition system is damaged.
● Mixture is too lean.
Insufficient power and high fuel consumption.
● Air cleaner is blocked.
● Ignition system is damaged.
● Mixture is too rich.
Air/Fuel mixture is extremely lean
● Fuel jet is blocked.
● Float valve is damaged.
● Oil level is low.
● Bad ventilation of air in tank cap.
● Fuel strainer screen is blocked.
● Fuel tube is bent, creased or blocked.
● Suction system is receiving secondary suction of air.
Air/Fuel mixture is extremely rich.
● Air jet is blocked.
● Float valve is damaged.
● Oil level is too high.
● Starter is damaged.
● Air cleaner is blocked.
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