Arctic Cat 400 Service Manual page 148

NOTE: To produce the proper 60° cross-hatch
pattern, use a low RPM drill (600 RPM) at the rate
of 30 strokes per minute. If honing oil is not avail-
able, use a lightweight petroleum-based oil. Thor-
oughly clean cylinder after honing using soap and
hot water. Dry with compressed air; then immedi-
ately apply oil to the cylinder bore. If the bore is
severely damaged or gouged, replace the cylinder.
4. If any measurement exceeds the limit, bore the
cylinder and install an oversized piston or
replace the cylinder.
NOTE: Oversized piston and rings are available.
The oversized piston and rings are marked for
identification.
Measuring Camshaft Runout
NOTE: If the camshaft is out of tolerance, it must
be replaced.
1. Place the camshaft on a set of V blocks; then
position the dial indicator contact point against
the shaft and zero the indicator.
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CC390D
ATV-1068A
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2. Rotate the camshaft and note runout; maximum
tolerance must not exceed specifications.
Measuring Camshaft Lobe Height
1. Using a calipers, measure each cam lobe height.
2. The lobe heights must not exceed minimum
specifications.
Inspecting Camshaft Bearing
Journal
1. Inspect the bearing journal for scoring, seizure
marks, or pitting.
2. If excessive scoring, seizure marks, or pitting is
found, the cylinder head assembly must be
replaced.
Measuring Camshaft to
Cylinder Head Clearance
1. Remove the adjuster screws and jam nuts.
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CC283D
ATV1013A
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