Arctic Cat 400 Service Manual page 204

Inspecting Cam Chain Guide
1. Inspect cam chain guide for cuts, tears, breaks,
or chips.
2. If the chain guide is damaged, it must be
replaced.
Honing Cylinder
1. Using a slide gauge and a dial indicator or a
snap gauge, measure the cylinder bore diameter
in three locations from top to bottom and again
from top to bottom at 90° from the first mea-
surements for a total of six measurements. The
trueness (out-of-roundness) is the difference
between the highest and lowest reading. Maxi-
mum trueness (out-of-roundness) must not
exceed specifications.
2. Wash the cylinder in parts-cleaning solvent.
3. Inspect the cylinder for pitting, scoring, scuff-
ing, and corrosion. If marks are found, repair the
surface using a ball hone.
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3-160
CC129D
CC127D
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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, replace
the cylinder and piston.
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.
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.
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CC390D
CC283D
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