Hpsd: After 07 - Honda CRF450X 2005 Service Manual

TECHNICAL FEATURE
HPSD (Honda Progressive Steering Damper): After '07
The steering damper is installed on the steering head pipe and the top bridge.
HPSD utilizes the angle change of the top bridge relative to the steering head pipe to compress or extend the damper rod.
The steering damper can be serviced, however the damper rod/piston is not serviceable.
Each component of HPSD functions as follows:
- Damper rod / pist on
The damping force is generated by the extension or the compression of the damper rod.
- Adjust e r piece/ Plug b o tt
The damping force can be adjusted with the adjuster piece by turning the plug bott. The adjuster piece adjusts the
dampi ng force of both compression and extension. Turning the plug bolt clockwise will increase damping force and
turning it counterclockwise will decrease damping force.
- Free piston / Reservoir/ Spri ng
When compressing the damper rod, damper oil moves temporari ly into the reservoir. The damper oil stored in the
reservoir is pushed back by the free piston. The free piston is moved by the spring tension and damper oil pressure.
- Damper case
There is a groove ins ide t he damper case. Progressive damping force is controlled by the configuration of the groove
within the damper case .
DAMPER ROD/PISTON
PLUG BOLT
SPRING
GROOVE
FREE PISTON
ADJUSTER PIECE
RESERVOIR
2-3