2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 158Get this manual
REMOVING THE CLUTCH 1Remove: Bolt Clutch spring NOTE: Loosen the bolts in stages and in crisscross pattern2Straighten the lock washer tab3Loosen: Primary drive gear nut Clutch boss nut NOTE: Place the aluminum plate between clutch housing and primary drive gearand then loosen the primary drive gear nut While holding the clutch boss with the universal clutch holderloosen the clutch boss nut Universal clutch holder 90890-04086, YM-91042