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3
Trouble Shooting Guide
Probable causes
Stop screw for the throttle not working
Fuel tank/hose
Pump diaphragm
Flow bellows
Carburettor is not fi tted correctly
Faulty heat insulation seal
Needle valve's lever
Needle valve's spring
Control diaphragm
Needle valve
28
Fuel system
Fuel fi lter blocked
The fuel hose blocked
Air in fuel ducts
Incorrect/poor fuel
Vacuum pulse leakage
Vacuum pulse duct blocked
Loose screw(s) on the pump cover
Faulty pump diaphragm
Flow bellows damaged
The needle valve faulty
Lever arm damaged
Lever arm too high
Lever arm too low
Lever arm does not work correctly
The spring is deformed
The spring is not fi tted correctly
Diaphragm is damaged
Faulty seal
Valve jams
Valve worn
Foreign object in the valve guide
Symptom
Starting
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Low speed
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Acceleration/
Deceleration/
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