Arctic Cat Sno Pro 120 2011, Service Manual

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1-7
1
Preparation After
Storage
Taking the snowmobile out of storage and correctly pre-
paring it for another season will assure many miles and
hours of trouble-free snowmobiling. Arctic Cat recom-
mends the following procedure:
1. Clean the snowmobile thoroughly. Polish the exte-
rior of the snowmobile.
2. Clean the engine. Remove the cloth from the exhaust
system. Check exhaust system and air silencer for
obstructions. On the turbo models, inspect the air fil-
ter and replace as necessary.
3. Inspect all control wires and cables for signs of wear
or fraying. Replace if necessary. Use cable ties or
tape to route wires and cables away from hot or rotat-
ing parts.
4. Remove and inspect the drive belt for cracks and
tears. Check belt specifications. Replace if damaged
or worn. Install the drive belt (see Section 6).

NOTE: If the old belt is worn but in reasonable con-
dition, retain it with the snowmobile as a spare in
case of emergency.
5. On the 570 cc, inspect the in-line fuel filter and
replace if necessary; then adjust the carburetors and
choke cable.
6. Inspect all fuel hoses and oil hoses for deterioration
or cracks; replace if necessary. Make sure all connec-
tions are tight.
7. On the 2-stroke models, fill the oil-injection reser-
voir with the recommended injection oil; then
inspect each spark plug. Replace, gap, or clean as
necessary.

NOTE: On the 2-stroke models after prolonged stor-
age, Arctic Cat recommends one tankful of 100:1 gas/
oil mixture be used in conjunction with the oil-injec-
tion system to ensure proper lubrication.
8. Adjust the throttle cable.
9. Tighten all nuts, bolts, and cap screws making sure
all calibrated nuts, bolts, and cap screws are tight-
ened to specifications.
10. If not done during preparation for storage, lubricate
all grease fittings (front and rear suspension, spin-
dles, and upper steering shafts on the Crossfire/M-
Series or steering arms on the Bearcat/F-Series/Z1/T-
Series) with an all-temperature grease.
11. On liquid cooled models, check the coolant level and
all coolant hoses and connections for deterioration or
cracks. Add properly mixed coolant as necessary.
12. On fan cooled models, clean the engine cooling fins
and all shrouding.
13. On electric start models, charge the battery; then
connect the battery cables making sure to connect the
positive cable first. Test the electric start system.
14. Inspect the entire brake system, all controls, head-
light, taillight, brakelight, ski wear bars, and head-
light aim; adjust or replace as necessary.
15. Adjust the track to the proper tension and alignment.
Lock the jam nuts.
16. Fill the gas tank with fresh, clean gas.
After Break-In Checkup
(100 Miles - 2-Stroke/600
Miles - 4-Stroke)
Certain areas require adjustment after the break-in period
in order to obtain peak performance. These areas are the
following.
CARBURETOR JETTING (570 cc) — Altitude, tem-
perature, and the use of oxygenated gasoline affect the
carburetion needed for optimum engine performance.
The carburetor main jets must be changed in conjunction
with changes in operating altitude, oxygenated gasoline
usage, and temperature.
DRIVE BELT DEFLECTION — Drive belt deflection
is very important to the snowmobile. Even if it is checked
and is correct when the snowmobile is set up, it does
change (more so during the break-in period). This is
because the rubber engine mounts and the rubber snubber
on the torque link will all take a “set” during the first 100
miles allowing the distance between the drive clutch and
driven pulley to shorten. When this happens, the snow-
mobile will appear to have a too long drive belt. To add
to this, the drive belt itself wears and stretches somewhat
leading to a low-end performance problem and, if not
corrected, causes premature drive belt wear.
After the break-in period, drive belt deflection should be
checked according to the instructions given in Section 6
of this manual.
DRIVE BELT BREAK-IN — Drive belts require a
break-in period of approximately 25 miles. Drive the
snowmobile for 25 miles at 3/4 throttle or less. By rev-
ving the engine up and down (but not exceeding 60 mph),
the exposed cord on the side of a new belt will be worn
down. This will allow the drive belt to gain its optimum
flexibility and will extend drive belt life.
CAUTION
On the 570 cc if the gas in each carburetor float cham-
ber was not drained prior to storage, the carburetors
must be cleaned before starting the engine.
! WARNING
Be sure to tighten the swivel adapter jam nuts securely.
If a jam nut isn’t tightened, the adjuster can rotate out of
the carburetor cap causing the piston valve not to
return to the full-closed position.
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