1981-1984 Official Honda ATC250R Shop Manual, Page 164Get this manual
R EAR SUSPENSION
ATe 250R
Thread the lock nut and adjusting nut onto the damper unitHold the upper shock mount in vise with soft jaws or shop towel with the hole straight upPull out the damper rod all the wayFill the damper with the recommended oilRecommended oil: HONDA ATF or equivalent