Combustion Chamber Cleaning - Polaris RANGER XP 900 2018-2019 Service Manual

4. Inspect split keeper groove for wear or flaring in the
keeper seat area.
NOTICE
The valves can be re-faced or end ground, if necessary.
They must be replaced if extensively worn, burnt, bent
or damaged.
5. 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)
6. 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)
9929399 R01 - 2018-2019 RANGER XP/ CREW 900/1000 Service Manual
© Copyright Polaris Industries Inc.
7. Be sure to measure each guide and valve

COMBUSTION CHAMBER CLEANING

total). Compare to
1. Clean
Carbon Clean Fuel Treatment (2871326) can be used
abrasive cleaners to clean the cylinder head. Damage
2. Visually inspect cylinder head gasket surface and
ENGINE / COOLING / HVAC SYSTEM
combination individually.
NOTICE
The valve guides cannot be replaced.
CAUTION
Wear eye protection during combustion chamber
cleaning.
all accumulated carbon
combustion chambers and valve seat area.
CAUTION
to help 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 areas around spark plug and valve
seats.
3
deposits from
3.39