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
-
44
-
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