Service manual

04-7
Auto Decompressor
AUTO DECOMPRESSOR - WORKING
PRINCIPLE
a. The Flyweight type decompressor
consists of a flyweight mechanism
mounted on the cam gear exhaust.
b. When the engine is cranking below
a certain speed (350 rpm approx.), a
pin rotates to protrude above the base
circle of the exhaust cam.
c. The pin momentorily open the
exhaust valve on the compression
stroke, lowering the pressure in the
cylinder head combustion chamber
thus leading to freeness when
starting engine.
BENEFITS OF AUTO
DECOMPRESSOR :
- Easy for kick or self start system.
- Avoids back kick and hence life of
the sprag clutch system enhanced.