Arctic Cat AC 120 2007, Operator'S Manual

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10
5. Remove the filler plug; then pour
550 ml (18.6 fl oz) of recom-
mended oil into the fill hole.
6. Install the filler plug; tighten until
snug.
7. Close and secure the hood.
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 calibra-
tion be made by an authorized Arctic
Cat Snowmobile dealer; however, three
external adjustments can be made on
the carburetor. These are the idle speed
screw, pilot air screw, and throttle cable.
0735-464
Idle Speed Screw
The idle speed screw controls the seat-
ing position of the throttle valve which
in turn determines the proper idle
speed. Rotate the screw clockwise to
increase engine idle speed and counter-
clockwise to decrease engine idle
speed.
Pilot Air Screw
The pilot air screw determines the fuel/
air mixture for idling. To adjust the pilot
air screw, use the following procedure:
1. Carefully rotate the pilot air screw
clockwise until a light “seating
resistance” is felt.
2. Rotate the pilot air screw counter-
clockwise 1 turn.
3. Start the engine and “fine tune” the
pilot air screw until the engine idles
smoothly.
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 lightly contacts 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:
1. Loosen the throttle cable wire bind-
ing screw.
! CAUTION
DO NOT force the pilot air screw
when seating; damage to the pilot
air screw will result.
! WARNING
Do not attempt to adjust the throt-
tle cable with the engine running.
Personal injury could result.