Arctic Cat S2009F5DFCUSG Operator's Manual page 51

 NOTE: If cable free-play gap is
not correct, rotate each swivel
adapter an equal amount until rec-
ommended free-play is achieved.
Each piston valve must be resting
against the tip of its idle speed
screw.
 NOTE: If throttle cable free-play
is incorrect, the carburetor safety
switches will be activated prema-
turely and the engine will not start.
Fine-Tuning Pilot Air
Screws and Idle Speed
Screws
1. While counting the rotations, care-
fully rotate the pilot air screws
clockwise until lightly seated.
! CAUTION
Do not force a pilot air screw when
rotating it clockwise; damage to
the pilot air screw needle tip will
result.
2. Rotate the pilot air screws counter-
clockwise the exact number of
rotations ± 1/4 turn from the seated
position as an initial setting.
3. Install the air-intake silencer boots
taking care that the boots are prop-
erly positioned and that the boots
are not "folded" in the air-intake
silencer causing a restriction of air
flow.
4. With the
shielded safety stand, start the
engine, release the brake lever
lock, and thoroughly warm up.
! WARNING
DO NOT stand behind the snowmo-
bile or near the rotating track.
NEVER run the track at high speed
when the track is suspended.
MAINTENANCE
snowmobile on
 NOTE: Make engine idle adjust-
ment only after the engine has
reached running
Since the idle speed screws have
not been fine-tuned, slight throttle
pressure may be necessary to
keep the engine running. Allow
engine to warm up for 2-3 minutes.
5. After the engine has been thor-
oughly warmed up, fine-tune the
pilot air screws (equally) and the
idle speed screws (equally) until
the engine runs smoothly.
 NOTE: Engine idle RPM should
be approximately 1500.
! WARNING
If a tachometer is not available,
care must be taken not to adjust
engine idle speed too high.
! CAUTION
It is important that the pilot air
screws are adjusted equally and
that the idle speed screws are
adjusted equally.
6. Test the throttle control lever by
compressing and releasing it sev-
eral times. The lever must return to
the idle position quickly and com-
pletely.
! WARNING
DO NOT operate the snowmobile
when any component in the throt-
a
tle system is damaged, frayed,
kinked, worn,
adjusted. If the snowmobile is
operated when the throttle system
is not functioning properly, per-
sonal injury could result.
temperature.
or improperly
47