2001 Yamaha YFM660 Raptor Factory Service Manual, Page 168Get this manual
FRONT ARMS AND FRONT SHOCK ABSORBERS
CHECKING THE BALL JOINT 1.Check: Ball joint (front arm-upper) Damagepitting Replace the front arm (upper)Free play Replace the front armTurns roughly Replace the front arm (upper)
2.Check: Ball joint (front arm-lower) Damagepitting Replace the ball jointFree play Replace the ball jointTurns roughly Replace the ball joint
Ball joint replacement steps: Clean the outside of the front lower armRemove the circlip and rubber boot 2Use the ball joint remover and installer setBall joint removerinstaller set: PNYM-01474, 90890-01474 Ball joint removerinstaller attachment set: PNYM-01480, 90890-01480