Arctic Cat 400 Service Manual page 332

3. Place the cylinder on the surface plate covered
with #400 grit wet-or-dry sandpaper. Using light
pressure, move the cylinder in a figure eight
motion. Inspect the sealing surface for any indi-
cation of high spots. A high spot can be noted by
a bright metallic finish. Correct any high spots
before assembly by continuing to move the cyl-
inder in a figure eight motion until a uniform
bright metallic finish is attained.
! CAUTION
Water or parts-cleaning solvent must be used in
conjunction with the wet-or-dry sandpaper or dam-
age to the sealing surface may result.
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.
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CC129D
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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.
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 or
replace the cylinder to accommodate an oversized
piston and rings.
NOTE: Oversized piston and rings are available
in 0.50 mm (0.020 in.) only.
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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