Automatic Compression Release - Segway SNARLER ATV 2021 Series Service Manual

ENGINE TOP END ENGINE TOP END
A A
B B
E E
B B
E E
Camshaft Inspection

Automatic Compression Release

Automatic Compression Release
The Automatic Compression Release momentarily opens
the exhaust valves on the compression stroke at very low
speeds. This allows some of the compression pressure
to escape, making it easy to turn over the engine during
starting.
Due to the simplicity of the mechanism, no periodic
maintenance is needed. There are only two symptoms
of problems with the Automatic Compression Release
mechanism【A】: compression is not released during
starting, and compression is released during running.
A A
(1) If compression is not released during starting, the
Weight Block are not returning to their rest position.
◆ Remove the camshaft (see Camshaft Removal).
◆ Remove the Automatic Compression Release unit.
◆ Visually inspect the spring.
If damaged, deformed, or missing, replace the spring.
◆ Remove the spring and move the Weight Block back
and forth.
If the Weight Block do not move smoothly, replace the
C C
Automatic Compression Release unit. Also inspect the
exhaust camshaft for any damage, and replace the
exhaust camshaft if necessary.
【B】Rest Position (compression is released)
【C】Weight Block
【D】Spring
D D
【E】Compression Release Pin
(2) If compression is released while the engine is running,
the Weight Block are not swinging out.
C C
◆ Remove the spring and move the Weight Block back
and forth.
(3) If the Weight Block do not move easily from the
retracted position, replace the Automatic Compression
Release unit. Also inspect the exhaust camshaft for any
damage, and replace the exhaust camshaft if necessary.
D D 【B】Running Position (compression is not released)
【C】Weight Block
【D】Spring
【E】Compression Release Pin
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