Arctic Cat Sno Pro 120 2011, Service Manual

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16. Start the remaining cap screws being very careful not
to move the cylinder head. ONLY FINGER-
TIGHTEN AT THIS TIME; then tighten the cap
screws in two steps to 25 ft-lb using the appropriate
pattern shown.
0742-200
0742-199
17. On the 800 cc, install the spark plugs and on both
models, tighten the spark plugs to 19 ft-lb; then
install the spark plug wires.

NOTE: On the 800 cc, connect the knock sensor
plug-in.

NOTE: If the knock sensor was removed or
replaced, it must be tightened to 17 ft-lb and secured
with a new lock plate.
18. Install the APV gaskets into position as noted during
disassembly; then with the raised edge (A) of the
bottom of the valve aligned with the channel (B) of
the cylinder, install the APV’s onto the cylinder and
secure with the cap screws. Tighten to 96 in.-lb.
CM147A
19. Install the side-plate brace; then secure with the cap
screws (coated with blue Loctite #243).

NOTE: Install the two front lower cap screws first to
properly align the remaining cap screws.
CM133B

NOTE: At this point if no additional engine service
work is necessary, proceed to Engine Installing - step
26.
Cleaning and Inspecting

NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is nec-
essary.
CYLINDER HEAD
1. Using a non-metallic carbon removal tool, remove
any carbon buildup from the combustion chambers
being careful not to nick, scrape, or damage the com-
bustion chambers or the sealing surfaces.
2. Inspect the spark-plug holes for any damaged
threads.
3. Inspect the cylinder head for flatness using a
straightedge and a feeler gauge. Acceptable warpage
must not exceed 0.002 in.

NOTE: If the warpage exceeds specification, resur-
face the cylinder head using procedures identified in
step 4.
FS270
800 cc
1000 cc
Manual
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