Honda TRX400X Owner's Manual page 130

Suspension
Rear Suspension Adjustment
The rear suspension can be adjusted for rider weight and riding
conditions by changing the rebound and compression damping.
The rear shock absorber assembly includes a damper unit that contains
high pressure nitrogen gas. Do not attempt to disassemble, service, or
dispose of the damper; see your Honda dealer. The instructions found in
this owner's manual are limited to adjustments of the shock assembly
only.
Rear Suspension Damping
Refer to Saf ety Precautions
Rebound Damping
LEFT REAR
(1) damping adjuster
(2) punch mark
(3) reference punch mark
Servicing Your Honda
122
on page 77 .
(2)
(1)
(3)