2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 186Get this manual
CLUTCH EBS00301
CHECKING THE CLUTCH PLATES The following procedure applies to all of the clutch plates1Check: clutch plate Damage Replace the clutch plates as set2Measure: clutch plate warpage (with surface plate and thickness gauge 1) Out of specification Replace the clutch plates as setClutch plate warpage 0.2 mm (0.0079 in)
EBS00302