Page 270 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

6. Measure diameter of valve stem with a micrometer in COMBUSTION CHAMBER CLEANING
three places, then rotate 90° and measure again
(take six measurements total). Compare to WARNING
specifications.
Wear eye protection during combustion chamber
cleaning.

1. Clean all accumulated carbon deposits from
combustion chambers and valve seat area q.

MEASUREMENT
Valve Stem Diameter:
Intake: 0.2155" - 0.2161" (5.475 - 5.490 mm)
Exhaust: 0.2147" - 0.2153" (5.455 - 5.470 mm)

7. Measure valve guide inside diameter at the top
middle and end of the guide using a small hole
gauge and a micrometer. Measure in two directions. NOTE

Carbon Clean Fuel Treatment (2871326) can be used
to help remove carbon deposits.
Do not use a metal scraper, a coarse wire brush or
abrasive cleaners to clean the cylinder head. Damage
may result.

2. Visually inspect cylinder head gasket surface and
combustion chamber for cracks or damage. Pay
close attention to the areas around spark plug and
valve seats.

MEASUREMENT
Valve Guide I.D.:
0.2165" - 0.2171" (5.500 - 5.515 mm)

8. Be sure to measure each guide and valve
combination individually.

NOTE
The valve guides cannot be replaced.

3.148 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.