Arctic Cat 450 XC 2011 Service Manual page 41

CAUTION
Care must be taken that the tab washer is installed
correctly to cover the alignment hole on the sprocket.
If the alignment pin falls out, severe engine damage
will result.
17. Apply red Loctite #271 to the first cap screw secur-
ing the sprocket and tab washer to the camshaft; then
install the cap screw and tab washer. Tighten cap
screw only until snug.
18. Rotate the crankshaft until the second cap screw
securing the sprocket to the camshaft can be
installed; then install the cap screw (threads coated
with red Loctite #271). Tighten to 11 ft-lb; then bend
the tab to secure the cap screw.
19. Rotate the crankshaft until the first cap screw (from
step 17) securing the sprocket to the camshaft can be
addressed; then tighten to 11 ft-lb. Bend the tab to
secure the cap screw.
40
20. Install the cylinder head plug with the cupped end
facing the camshaft and the opening directed down-
wards.
21. Place the cam chain tensioner assembly and gasket
into the cylinder. Tighten to 10 ft-lb.
22. Using a flat-blade screwdriver, turn the tensioner
screw counterclockwise to apply tension to the cam
chain; then install the cap screw plug and washer and
tighten securely.
MD1363
23. Loosen the adjuster screw jam nuts; then loosen the
adjuster screws on the rocker arms in the valve cover.
24. Apply a thin coat of Three Bond Sealant to the mat-
ing surface of the valve cover; then place the valve
cover into position. Note that the two alignment pins
are properly positioned.
 NOTE: At this point, the rocker arms and adjuster
screws must not have pressure on them.
25. Install the four top-side cap screws with rubber
washers; then install the remaining cap screws.
Tighten only until snug.
CC404D
26. In a crisscross pattern starting from the center and
FI612
working outward, tighten the cap screws (from step
25) to 8 ft-lb.
27. Adjust valve/tappet clearance (see Periodic Mainte-
nance).
28. Place the two tappet covers with O-rings into position;
then install and tighten the cap screws to 8 ft-lb.
Manual
Table of Contents
FI608
MD1261