Arctic Cat 400 Service Manual page 259

2. Remove the valve seal and the lower remaining
spring seat. Discard the valve seal.
NOTE: The valve seals must be replaced.
3. Remove the valve springs; then invert the cylin-
der head and remove the valves.
Measuring Valve Stem Runout
1. Support each valve stem end with the V Blocks
(p/n 0644-022); then check the valve stem
runout using a dial indicator.
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2. Maximum runout must not exceed specifica-
tions.
Measuring Valve Stem
Outside Diameter
1. Using a micrometer, measure the valve stem
outside diameter.
2. Acceptable diameter range (intake valve) must
be within specifications.
3. Acceptable diameter range (exhaust valve) must
be within specifications.
Measuring Valve Face/Seat Width
1. Using a micrometer, measure the width of the
valve face.
2. Acceptable width range must be within specifi-
cations.
Measuring Valve Face Radial
Runout
1. Mount a dial indicator on the surface plate; then
place the valve stem on a set of V blocks.
2. Position the dial indicator contact point on the
outside edge of the valve face; then zero the
indicator.
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ATV-1082
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ATV-1004
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