POOR PERFORMANCE AT IDLE SPEED/
UNSATISFACTORY PERFORMANCE AT MEDIUM-HIGH SPEED
8-3
TRBL
SHTG
?
Carburetor
Electrical system
Valves
PROBABLE CAUSES
•
The starter piston fails to return freely
•
Pilot jet obstructed or loose
•
Pilot jet obstructed
•
Pilot air screw wrongly set
•
Idle speed wrongly set
(throttle valve stop screw)
•
Throttle cable free play wrongly set
•
Carburetor flooded
•
Valve clearance wrongly set
Air filter
•
Air filter element obstructed
POOR PERFORMANCE AT IDLE SPEED
See “FAILURE TO START/DIFFICULTIES IN STARTING”.
(FUEL SYSTEM, ELECTRICAL SYSTEM, COMPRESSION SYSTEM and Valve clearance)
Carburetor
PROBABLE CAUSES
•
Petrol contains water or impurities or is adulterated
•
Infiltrations of air
•
Deformation of float
•
Defective diaphragm
•
Needle valve worn or scratched
•
Needle valve seat insufficiently sealed
•
Needle stop position incorrect
•
Fuel level set wrongly
•
Main jet obstructed or loose
•
Main nozzle obstructed or loose
UNSATISFACTORY PERFORMANCE AT MEDIUM-HIGH SPEED
•
Defective battery
•
Defective spark plug
•
Defective ignition unit
•
Defective AC magneto
•
Defective ignition coil
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