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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
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6. Measure diameter of valve stem with a micrometer in
three places, then rotate 90° and measure again
(take six measurements total). Compare to
specifications.
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.
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.
NOTICE
The valve guides cannot be replaced.
COMBUSTION CHAMBER CLEANING
WARNING
Wear eye protection during combustion chamber
cleaning.
1. Clean all accumulated carbon deposits from
combustion chambers and valve seat area
q
.
NOTICE
Polaris Premium Carbon Clean 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.
ENGINE / COOLING SYSTEM
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