2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 159Get this manual
CHECKING THE FRICTION PLATES The following procedure applies to all of the friction plates1Check: Friction plate DamagewearReplace the friction plate2Measure: Friction plate thickness Out of specificationReplace the friction plateNOTE: Measure the friction plate at four placesFriction plate thickness 2.93.1 mm (0.1140.122 in) Wear limit 2.8 mm (0.110 in)