1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 150Get this manual
REAR WHEELDRIVE MECHANISM Remove the O-ring from the axle
INSPECTION
Place the axle in V-blocks and measure the runout SERVICE LIMIT: 3.0 mm 10.12 in)
INSTALLATION
Place anew O-ring on th axle and install the axle fr0m the left side
Install the brake disc onto the disc hub with its arrow facing th outsideApply light coating of grease or oil to the disc socket bolt threads and tighten the bolts