Yamaha YZ250FM 2021 Owner's Service Manual

TROUBLESHOOTING9-6EAM30511TROUBLESHOOTING OF TRANSMISSIONSymptom Possible cause ActionsDifficult or impossible to shifttransmission gearClutch drags Refer to “Clutch drags”.Improperly adjusted shift rod Adjust the shift rod installationlength.Bent shift shaft Replace the shift shaft.Foreign object in a shift drumgrooveRemove foreign object from shiftdrum groove.Damaged shift drum Replace the shift drum.Seized shift fork Replace the shift fork and shift forkguide bar as a set.Bent shift fork guide bar Replace the shift fork guide bar.Foreign object between transmis-sion gearsRemove foreign object from trans-mission gears.Seized transmission gear Replace the seized gear and theaxle as a set.Improperly assembled transmis-sionReassemble the transmission axleassembly.Jumps out of gearIncorrect shift pedal position Adjust the shift pedal position.Improperly returned stopper lever Replace the stopper lever spring.Bent or worn shift fork Replace the shift fork.Shift drum incorrect axial play Replace the shift drum.Worn shift drum groove Replace the shift drum.Worn transmission gear dog Replace the transmission gear.Transmission noiseDamaged or worn transmissiongear Replace the transmission gear.Worn main axle spline Replace the main axle.Worn drive axle spline Replace the drive axle.Worn bearing Replace the bearing.