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9924871 R03 - 2014 Polaris Sportsman® 570 EFI Service Manual
© Copyright 2013 Polaris Sales Inc.
Valve Inspection
1. Remove all carbon from valves with a soft wire wheel
or brush.
2. Check valve face for excessive runout, pitting, and
burnt spots.
3. To check for bent valve stems, mount valve in “V”
blocks and measure with a dial indicator.
4. Check the end of the valve stem for flaring, pitting,
wear or damage.
5. 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.
6. 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)
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.
Valve Guide I.D.:
0.2165" - 0.2171" (5.500 - 5.515 mm)
8. Be sure to measure each guide and valve
combination individually.
NOTE: The valve guides cannot be replaced.
ENGINE
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