3.40
9925723 R01 - 2015
RZR
900 Service Manual
© Copyright 2014 Polaris Industries Inc.
5.
Measure diameter of valve stem with a micrometer in
three places, then rotate 90° and measure again
(take
six
measurements
total).
Compare
to
specifications.
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.
Valve Guide I.D.:
0.2165 - 0.2171" (5.500 - 5.515 mm)
7.
Be
sure
to
measure
each
guide
and
valve
combination individually.
NOTE: 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
1
.
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 areas around spark plug and valve
seats.
ENGINE / COOLING SYSTEM