Page 168 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

EXHAUST CAMSHAFT DECOMPRESSION As the engine starts, the camshaft rotational speed
MECHANISM increases dramatically. Centrifugal force causes the
flyweight to override the spring pressure and swing out
NOTE away from the camshaft.
Removal of the decompression mechanism is not
necessary unless replacement is required.

The decompression mechanism consists of screw q,
domed washer w, flyweight e, and spring r.

The cam on the flyweight rotates into recess on the
camshaft and no longer makes contact with the tappet.

During engine start up, the spring holds the flyweight in
the active position.

1. When servicing the decompression system, note the
orientation of the domed washer. The dome faces
inwards.

2. Replace the decompression assembly if any
excessive wear or binding is evident.
A cam is located on the end of the flyweight. In the active 3. During assembly, install the spring so A fits around
position, the cam pushes against the tappet to open the the flyweight, and the spring tail B engages the
exhaust valve and bleed cylinder pressure. camshaft flat B.

3.46 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.