Has anyone experienced an unspecified rattle coming from inside the clutch case? Upon inspection, it was found that the main gear bolt, behind the clutch basket was loose, and that the main gear, and oil pump gear were very loose, and the shear pin on the main gear was almost sheared in half. The suspected cause is a bad day at yamaha. Anyone else ever run into this problem? New shear pin, tightening of the bolts, and some new clutch plates, and no more rattle.