Robin EH30V - AUTOMATIC Decqmpresslon SYSTEM

7. AUTOMATIC DECOMPRESSION SYSTEM
The decompression system operates to release compression by lifting up the exhaust valve at n
starting.
The release lever mounted on the camshaft has a flyweight at one end and
a crescent cam at
the other end. When starting the engine, the crescent cam juts out from the exhaust cam.
The exhaust tappet rides over the crescent cam opening the exhaust valve to release compression.
LEVER
CRESCENT
EXHAUST
Fig. 68
When the crank speed reaches a certain revolution, the flyweight of the release lever moves outward
by the centrifugal force turning the release lever to retract the crescent cam. Thus the exhaust
valve closes allowing
a sufficient compression for the engine to start up.
/1
CRESCENT CAM
EXHAUST CAM
Fig. 69
LEVER
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