AUTO-DECOMPRESSION SYSTEM (After 4)7
DURING STARTING (WHEN ENGINE IS OFF)
The decompressor plunger protrudes from the exhaust cam lobe, and depresses the exhaust valve via the rocker arm.
The exhaust valve is slightly opened, and releases some cylinder compression for easy starting.
After the engine starts, the decompressor weight moves outward by centrifugal force.
The decompressor weight turns pin (A) on the decompressor shaft.
Pin (B) on the decompressor shaft turns with the decompressor shaft, and pulls the decompressor plunger into the exhaust cam lobe.
HPSD (Honda Progressive Steering Damper): After '07
The steering damper is installed on the steering head pipe and the top bridge.
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HPSD utilizes the angle change of the top bridge relative to the steering head pipe to compress or extend the damper rod.
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The steering damper can be serviced, however the damper rod/piston is not serviceable.
Each component of HPSD functions as follows:
The damping force is generated by the extension or the compression of the damper rod.
The damping force can be adjusted with the adjuster piece by turning the plug bolt. The adjuster piece adjusts the damping 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/Spring
When compressing the damper rod, damper oil moves temporarily 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.
There is a groove inside the damper case. Progressive damping force is controlled by the configuration of the groove within the damper case.
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