2010 Polaris Sportsman 850 Service Manual, Page 128Get this manual

2010 Polaris Sportsman 850 Service Manual, Page 128

ENGINE Valve Inspection 12Remove all carbon from valves with soft wire wheel or brushCheck valve face for runout, pitting,
at the top middle and end of the guide using small hole gauge and micrometerMeasure in two directionsCheck end of valve stem
for flaring, pitting, wear or damage = In mmValve Guide I.D 0.217"0.0005"0.0" (5.520.0120.0 mm) 4Inspect split keeper groove
for wear or flaring of the keeper seat area7Subtract valve stem measurement from the valve guide measurement to obtain stem
to guide clearanceNOTE: The valve guides cannot be replacedBe sure to measure each guide and valve combination individually