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ENGINE / COOLING
9924096 - 2013 RANGER RZR XP 900 / RZR XP 4 900 Service Manual
© Copyright 2012 Polaris Sales Inc.
7. Repeat the previous steps to remove the remaining
valves.
8. Clean the combustion chamber and head gasket
surface.
9. Measure the free length of each valve spring with a
Vernier caliper and compare to specification.
Valve Inspection
1. Remove all carbon from valves with a soft wire wheel
or brush.
2. Check valve face for runout, pitting, and burnt spots.
To check for bent valve stems, mount valve in a drill
or use “V” blocks and a dial indicator.
3. Check the end of the valve stem for flaring, pitting,
wear or damage.
4. Inspect split keeper groove for wear or flaring in the
keeper seat area.
NOTE: 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 total). Compare to specifications.
Valve Spring Free Length:
Standard: 1.7263" (43.85 mm)
Service Limit: 1.6830" (42.75 mm)
Valve Stem Diameter:
Intake: 0.2155" - 0.2161" (5.475 - 5.490 mm)
Exhaust: 0.2147" - 0.2153" (5.455 - 5.470 mm)
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