Page 139 - Manual Oficina Polaris RS1 2018 e 2019

ENGINE / COOLING SYSTEM

5. 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.

3

MEASUREMENT
Valve Stem Diameter:
Intake:
.2155 - .2161" (5.475 - 5.490 mm)
NOTE
Exhaust: Carbon Clean Fuel Treatment (2871326) can be used
.2147 - .2153" (5.455 - 5.470 mm) to help remove carbon deposits.
Do not use a metal scraper, a coarse wire brush or
6. Measure valve guide inside diameter at the top, abrasive cleaners to clean the cylinder head. Damage
middle and end of the guide using a small hole may result.
gauge and a micrometer. Measure in two directions.
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.

MEASUREMENT
Valve Guide I.D.:
.2165 - .2171" (5.500 - 5.515 mm)

7. Be sure to measure each guide and valve
combination individually.
NOTE
The valve guides cannot be replaced.

9928689 - 2018 RZR RS1 Service Manual 3.53
© Copyright Polaris Industries Inc.