1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 157Get this manual
REAR WHEELDRIVE MECHANISM After '87: Make clearance between the caliper bolt hole {8 mml and swing arm while turning the bearing holderInstall th rear axle an rear brake caliper (page 11-51
After '87: Align the right tang of the bearing holder with punch mark on the swing armInstall the drive chain (page 11 -71 Install the rear wheels (page 11-2)Adjust the drive chain (page 2-9)