3.48
9926806 R03 - 2015 - 2016 RANGER ETX / 570 2-SEAT 2015 - 2016 RANGER 570 CREW Service Manual
© Copyright Polaris Industries Inc.
During engine start up, the spring holds the flyweight in
the active position.
A cam is located on the end of the flyweight. In the active
position, the cam pushes against the tappet to open the
exhaust valve and bleed cylinder pressure.
As the engine starts, the camshaft rotational speed
increases dramatically. Centrifugal force causes the
flyweight to override the spring pressure and swing out
away from the camshaft.
The cam on the flyweight rotates into recess on the
camshaft and no longer makes contact with the tappet.
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.
3. During assembly, install the spring so
A
fits around
the flyweight, and the spring tail
B
engages the
camshaft flat
B
.
4. Install the domed washer with the dome facing
inwards. Install screw and torque to specification.
TORQUE
Decompression Mechanism Screw:
27 ft-lbs (29 Nm)
5. Be sure the decompression mechanism functions
smoothly and easily returns under spring pressure to
the resting position against gravity.
ENGINE / COOLING SYSTEM
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