Yamaha YZ125 Owner's Manual

Also see for YZ 125: Parts catalog Owner's service manual Owner's service manual Owner's service manual Owner's service manual

TROUBLESHOOTING7-10Front fork is softFatigued or broken fork spring Replace the fork spring.Incorrect oil viscosity (low) Change to recommended fork oil.Incorrect oil level (low) Adjust to the specified oil level.Improperly adjusted spring pre-load (soft) Adjust the spring preload.Improperly adjusted rebounddamping (soft) Adjust the rebound damping.Improperly adjusted compressiondamping (soft) Adjust the compression damping.Leaking oil from front forkBent, damaged, or corroded innertube Replace the inner tube.Cracked or damaged outer tube Replace the outer tube.Improperly installed oil seal Replace the oil seal.Damaged oil seal lip Replace the oil seal.Incorrect oil level (high) Adjust to the specified oil level.Loose damper rod assembly bolt Tighten the damper rod assemblybolt to the specified torque.Damaged damper rod assemblybolt copper washerReplace the damper rod assemblybolt copper washer.Cracked or damaged cap bolt O-ring Replace the cap bolt O-ring.Rear suspension is hardBent or damaged rear shockabsorber rod Replace the rear shock absorber.Bent swingarm pivot shaft Replace the swingarm pivot shaft.Damaged or worn swingarm bear-ing or bushingReplace the swingarm bearing orbushing.Damaged or worn relay arm bear-ing Replace the relay arm bearing.Damaged or worn connecting armbearingReplace the connecting arm bear-ing.Improperly adjusted rear shockabsorber spring preload (hard) Adjust the spring preload.Improperly adjusted rear shockabsorber rebound damping (hard) Adjust the rebound damping.Improperly adjusted rear shockabsorber compression damping(hard)Adjust the compression damping.Symptom Possible cause Actions