Combustion Chamber Cleaning - Polaris RANGER 500 2017 Service Manual

6. Measure diameter of valve stem with a micrometer in
three places, then rotate 90° and measure again
(take six measurements
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.
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.

COMBUSTION CHAMBER CLEANING

total). Compare to
1. Clean
Polaris Premium Carbon Clean can be used to help
abrasive cleaners to clean the cylinder head. Damage
2. Visually inspect cylinder head gasket surface and
ENGINE / COOLING SYSTEM
WARNING
Wear eye protection during combustion chamber
cleaning.
all accumulated carbon
combustion chambers and valve seat area
NOTICE
remove carbon deposits.
Do not use a metal scraper, a coarse wire brush or
may result.
combustion chamber for cracks or damage. Pay
close attention to the areas around spark plug and
valve seats.
deposits from
q
.
3
3.99