Auto-Decompression System (After 07); During Starting (When Engine Is Off); After The Engine Starts - Honda CRF450X 2005 Service Manual

TECHNICAL FEATURE
AUTO-DECOMPRESSION SYSTEM (After '07)
DURING STARTING
(WHEN ENGINE IS OFF):
DECOMPRESSOR PLUNGER
CAMSHAFT
DEC:OMIPRE'SS,)R SHAFT
)AI
ROCKER ARM
AFTER THE ENG INE STARTS:
VALVE
DEC:O.,PRESE:OR WEIGHT
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, end releases some cylinder compression for easy starting .
AFTER THE ENGINE STARTS
After the engine starts, the decompressor weight moves outward by centrifugal force.
The decompressor weight turns pin (A) on the decompressor shaft.
Pin (8) on the decompressor shaft turns with the decompressor shaft, and pulis the decompressor plunger into the exhaust
cam lobe.
2-2
•
•