3-17
3
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.
CC390D
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 posi-
tion the dial indicator contact point against the
shaft and zero the indicator.
CC283D
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.
ATV1013A
2. The lobe heights must not exceed minimum speci-
fications.
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.
CC005D
2. Place a strip of plasti-gauge in each of the cam-
shaft lands in the cylinder head.
3. Place the valve cover on the cylinder head and
secure with the valve cover cap screws. Tighten
securely.
NOTE: Do not rotate the camshaft when measur-
ing clearance.
4. Remove the cap screws securing the valve cover to
the cylinder; then remove the valve cover and
camshaft.
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