1983-1985 Original Honda ATC 200X Shop Manual, Page 163Get this manual
REAR SUSPENSION
Thread the spring adjusting nut and lock nut onto the damper unitTilt the damper unit in vise as shownCompress the damper rod fully and pour oil into the damper unit
RECOMMENDED OIL: ATF
Fill the damper unit with ATF by pulling out the damper rod all the way