Automatic decompressor
Automatic decompressors are sometimes equipped to pull-start
starters.
During starting, the decompression pin attached to the camshaft
is pushed in by the flyweight, which in turn pushes up the
tappet just before compression top dead center, temporarily
opening the exhaust valve so that compression pressure can be
released.
This enables the recoil rope to be pulled with a lighter force.
When the engine is started and its speed increased, centrifugal
force opens the flyweight outward, causing the decompression pin
to drop.
This enables the exhaust valve to open and close normally.
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