MAINTENANCE
47
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.
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 snowmobile on a
shielded safety stand, start the
engine, release the brake lever
lock, and thoroughly warm up.
NOTE: Make engine idle adjust-
ment only after the engine has
reached running temperature.
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.
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.
! CAUTION
Do not force a pilot air screw when
rotating it clockwise; damage to
the pilot air screw needle tip will
result.
! 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.
! 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.
! WARNING
DO NOT operate the snowmobile
when any component in the throt-
tle system is damaged, frayed,
kinked, worn, or improperly
adjusted. If the snowmobile is
operated when the throttle system
is not functioning properly, per-
sonal injury could result.
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