Arctic Cat 450 XC 2011 Service Manual page 29

3. Remove the cap screw from the tension adjuster;
then using a common screwdriver, relax the cam
chain tension by rotating the adjuster screw clock-
wise until it locks.
4. Bend the washer tabs and remove the two cap screws
securing the sprocket to the camshaft.
28
5. Using an awl, rotate the C-ring in its groove until it is
out of the cylinder head; then remove the C-ring.
MD1354A
 NOTE: Care should be taken not to drop the C-ring
down into the crankcase.
FI607A
6. Noting the timing marks for installing purposes, drop
the sprocket off the camshaft. While holding the cam
chain, slide the sprocket and camshaft out of the cyl-
inder head. Account for an alignment pin.
 NOTE: Loop the chain over the cylinder and secure
it to keep it from falling into the crankcase.
FI608
FI612
Manual
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FI613
MD1131
FI620