1985-1986 Honda ATC250R Shop Manual, Page 178Get this manual
REAR SUSPENSION Visually inspect the damper unit for dents, oil leaks or other damageReplace the damper unit if necessaryPlace the damper rod on scale and measure the force required to compress the damper unit 10 mm (0.14 in)
SPECIFIED FORCE: '85: 15-25 kg (33-55 Ib) AFTER '85: 23.1-38.5 kg (51-85 Ib)
If the force required is less than 15 kg (33 Ibs) gas is leak ingExam ine the damper rod and replace the damper if the rod is bent or scored
DISASSEMBLY
Depress the Schrader valve to release the nitrogen from the reservoirCAUTION