Arctic Cat Cougar Service Manual page 175

ENGINE
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2. Inspect the spark plug threads in the cylinder
head (A, Figure 36) for any signs of carbon
buildup or damage. The carbon can be removed
with a 14 mm spark plug thread chaser (Figure
37). Reinstall the spark plug and make sure it can
be threaded into the cylinder head completely.
3. On liquid-cooled engines, inspect the re-
cesses on top of the cylinder head around the
retaining screws for damage or corrosion that
would interfere with sealing.
4. Use a straightedge and feeler gauge to meas-
ure the flatness of the cylinder head. Small im-
perfections or slight warping can be removed by
resurfacing the cylinder head as follows:
a. Tape a piece of 400-600 grit wet emery
sandpaper to a piece of thick plate glass or
surface plate.
b. Slowly resurface the head by moving it in a
figure-eight pattern on the sandpaper (Fig-
ure 38).
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