Honda TRX450ER Owner's Manual page 138

Suspension
Suspension Adjustment
The suspension can be adjusted for rider weight and riding conditions by
changing the rebound and compression damping.
The shock absorber assemblies include 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 assemblies.
Servicing Your Honda 129