Carburetor - Arctic Cat 120 Sno Pro Operator's Manual

3. Loosen the oil level stick; then
remove the oil drain plug from the
crankcase and allow the oil to
drain.
4. Install the drain plug.
5. Remove the oil level stick; then
pour 600 ml (20.3 fl oz) of recom-
mended oil into the fill hole.
6. Install the oil level stick; then
tighten until snug. Install the
access plug.
7. Close the hood and secure with the
straps and latch.

CARBURETOR

The carburetor has been calibrated for
average riding conditions; however,
altitude, temperature, and general wear
may necessitate certain carburetor
adjustments. Since carburetor adjust-
ments critically affect engine perfor-
mance, Arctic Cat recommends that
any changes in internal carburetor cali-
bration be made by an authorized Arc-
tic Cat Snowmobile dealer; however,
three external adjustments can be made
on the carburetor. These are the throttle
stop screw, idle fuel adjuster screw, and
throttle cable.
Throttle Stop Screw
This screw controls the seating position
of the throttle valve which in turn
determines the proper idle speed.
Rotate the screw clockwise to increase
engine idle speed and counterclock-
wise to decrease engine idle speed.
Idle Fuel Adjuster
Screw
This adjuster screw determines the
fuel/air mixture for idling. To adjust,
use the following procedure:
1. Start the engine and allow to run at
half throttle 5-10 minutes to warm
up.
2. Place the throttle in the idle posi-
tion; then rotate the idle fuel
adjuster screw/cap in or out within
the adjustment range to obtain
smooth low speed performance.
Throttle Cable
The correct throttle cable adjustment is
when (with the engine OFF) the carbu-
retor throttle is completely open
(against its limit) while the throttle
lever comes just short of contacting the
handlebar grip. The throttle arm on the
carburetor should also contact the
speed control screw when the throttle
lever is released.
To adjust the throttle cable, use the fol-
lowing procedure:
! WARNING
Do not attempt to adjust the throt-
tle cable with the engine running.
Personal injury could result.
1. Loosen the throttle cable jam nuts.
0744-921
2. Pull all slack from the throttle
cable wire and exert slight tension
on the wire.
0744-922
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