Faulty Gear Shifting; Hard Shifting; Jumps Out Of Gear; Clutch Slipping - Yamaha YFM250XL(C) Service Manual

FAULTY GEAR SHIFTING

HARD SHIFTING

Refer to "CLUTCH SLIPPING/DRAGGING-CLUTCH DRAGGING".
SHIFT PEDAL DOES NOT MOVE
Shift shaft
Bent shift shaft
Shift cam, shift fork
Groove jammed with impurities
Seized shift fork
Bent shift fork guide bar

JUMPS OUT OF GEAR

Shift shaft
Improperly adjusted shift lever position
Improperly returned stopper lever
Shift fork
Worn shift fork

CLUTCH SLIPPING

CLUTCH SLIPPING
Clutch
Improperly adjusted clutch release lever
free play
Loose clutch spring (primary and/or sec-
ondary)
Fatigued clutch spring (primary and/or
secondary)
Worn friction plate
Worn clutch plate
Worn clutch shoe (primary)

CLUTCH DRAGGING

CLUTCH DRAGGING
Clutch
Improperly adjusted clutch release lever
free play
Improper engagement of release lever
and push rod
Warped clutch plate
Swollen friction plate
Broken clutch boss
9
FAULTY GEAR SHIFTING/
FAULTY CLUTCH PERFORMANCE
Transmission
Seized transmission gear
Jammed impurities
Incorrectly assembled transmission
Shift guide
Broken shift guide
Shift cam
Improper thrust play
Worn shift cam groove
Transmission
Worn gear dog
Engine oil
Low oil level
Improper quality (low viscosity)
Deterioration
Engine oil
High oil level
Improper quality (high viscosity)
Deterioration
9 - 4
TRBL
SHTG