Poor Performance At Idle Speed; Unsatisfactory Performance At Medium-High Speed - Yamaha TT600R Service Manual

UNSATISFACTORY PERFORMANCE AT MEDIUM-HIGH SPEED

POOR PERFORMANCE AT IDLE SPEED

Carburetor
Electrical system
Valves
UNSATISFACTORY PERFORMANCE AT MEDIUM-HIGH SPEED
See "FAILURE TO START/DIFFICULTIES IN STARTING".
(FUEL SYSTEM, ELECTRICAL SYSTEM, COMPRESSION SYSTEM and Valve clearance)
Carburetor
Air filter
POOR PERFORMANCE AT IDLE SPEED/
PROBABLE CAUSES
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PROBABLE CAUSES
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8-3
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
Defective battery
Defective spark plug
Defective ignition unit
Defective AC magneto
Defective ignition coil
Valve clearance wrongly set
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
Air filter element obstructed
?
TRBL
SHTG