56
MAINTENANCE
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 coun-
terclockwise the exact number of
rotations ± 1/4 turn from the
seated position as an initial set-
ting.
3. On some models, install the air-
intake silencer boots taking care
that the boots are properly posi-
tioned and that the boots are not
“folded” in the air-intake silencer
causing a restriction of air flow.
4. On some models, install the baf-
fle/resonator and the cover/tool
tray assembly.
5. 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 min-
utes.
6. 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: If a tachometer is being
used, engine idle RPM should be
approximately 1500.
7. Test the throttle control lever by
compressing and releasing it sev-
eral times. The lever must return
to the idle position quickly and
completely.
! CAUTION
Do not force a pilot air screw
when rotating it clockwise; dam-
age to the pilot air screw needle
tip will result.
! WARNING
DO NOT stand behind the snow-
mobile 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.
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