Valve Inspection - Polaris 2009 Sportsman XP 850 Service Manual

ENGINE

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 end of valve stem for flaring, pitting, wear or
damage.
4. Inspect split keeper groove for wear or flaring of 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.
5.30
5. Measure diameter of valve stem with a micrometer in three
places, then rotate 90 degrees and measure again (six
measurements total). Compare to specifications.
Measure valve stem in several places.
Rotate the valve 90 degrees and measure
for wear.
Valve Stem Diameter:
Intake: 0.2356" + 0.00039"
(5.985 + 0.01 mm)
Exhaust: 0.2351" + 0.00039"
(5.972 + 0.01 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.:
0.23672" + 0.000295"
(6.0617 + 0.0075 mm)
7. Subtract valve stem measurement from the valve guide
measurement to obtain stem to guide clearance. NOTE: The
valve guides cannot be replaced. Be sure to measure each
guide and valve combination individually.
= In. / mm.
= In. / mm.