Arctic Cat 650 Twin2004 Service Manual page 53

2. Inspect the cylinder for pitting, scoring, scuffing,
warpage, and corrosion. If marks are found, repair
the surface using a cylinder hone (see Honing
Cylinder in this sub-section).
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
indication 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
cylinder 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
damage 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 measurements for a
total of six measurements.
(out-of-roundness) is the difference between the
highest and lowest reading. Maximum trueness
(out-of-roundness) must not exceed specifications.
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2. Wash the cylinder in parts-cleaning solvent.
3. Inspect the cylinder for pitting, scoring, scuffing,
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.
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4. If any measurement exceeds the limit, replace the
cylinder.
Measuring Camshaft Runout
The trueness

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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