Troubleshooting Of Transmission - Yamaha YZ250X 2022 Owner's Service Manual

Symptom
Clutch noise
EAM30511

TROUBLESHOOTING OF TRANSMISSION

Symptom
Difficult or impossible to shift
transmission gear
Jumps out of gear
Transmission noise
Possible cause
Damaged or worn primary driven
gear
Loose clutch boss nut
Fatigued clutch damper
Worn clutch housing bearing
Worn pressure plate bearing
Possible cause
Clutch drags
Improperly adjusted shift rod
Bent shift shaft
Foreign object in a shift drum
groove
Damaged shift drum
Seized shift fork
Bent shift fork guide bar
Foreign object between transmis-
sion gears
Seized transmission gear
Improperly assembled transmis-
sion
Incorrect shift pedal position
Improperly returned stopper lever
Bent or worn shift fork
Shift drum incorrect axial play
Worn shift drum groove
Worn transmission gear dog
Damaged or worn transmission
gear
Worn main axle spline
Worn drive axle spline
Worn bearing
9-7
TROUBLESHOOTING
Actions
Replace the primary drive gear or
crankshaft, and the clutch housing
as a set.
Tighten the clutch boss nut to the
specified torque.
Replace the clutch housing.
Replace the clutch housing bear-
ing.
Replace the pressure plate bear-
ing.
Actions
Refer to "Clutch drags".
Adjust the shift rod installation
length.
Replace the shift shaft.
Remove foreign object from shift
drum groove.
Replace the shift drum.
Replace the shift fork and shift fork
guide bar as a set.
Replace the shift fork guide bar.
Remove foreign object from trans-
mission gears.
Replace the seized gear and the
axle as a set.
Reassemble the transmission axle
assembly.
Adjust the shift pedal position.
Replace the stopper lever spring.
Replace the shift fork.
Replace the shift drum.
Replace the shift drum.
Replace the transmission gear.
Replace the transmission gear.
Replace the main axle.
Replace the drive axle.
Replace the bearing.