2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 263Get this manual
REAR SHOCK ABSORBER, SWINGARM AND DRIVE CHAIN
Swingarm free play limit (at the end of the swingarm) 1.0 mm (0.04 in) bCheck the swingarm side play by moving it from side to sideIf side play is noticeable, check the spacer, bearings and frame pivotcCheck the swingarm vertical movement by moving it up and downIf vertical movement is tight or rough, or if there is binding, check the spacer, bearings and frame pivot2Remove: pivot shaft nut washer pivot shaft swingarm