Honda 2006 CB600F Owner's Manual page 141

Suspension
Rear Suspension Adjustment
The rear suspension can be adjusted for
rider (and passenger) weight and riding
conditions by changing the spring pre-load.
The rear shock absorber 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.
132
Servicing Your Honda