1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 166Get this manual
REAR SUSPENSION Connect the hose to the shock using new sealing washers, aligning the marks on the damper case and hose jointTighten the oil bolt
TORQUE: 28-32 N'm (2.8-3.2 kg-m, 20-23ft-lb)
Dip the reservoir-end of the hose into container filled with shock oilVery slowly compress the damper rod until bubbles disappear, then slowly pull the rod outRepeat this until all air has been bled from the hose and shockRemove the hose from the oil and keep the shock upright and the open hose end elevated to avoid losing any shock oil