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9. At this point, there must be 0.75-1.5
mm (0.030-0.060 in.) of cable free-
play gap in the throttle lever. If there
is no cable free-play in the throttle
lever, the throttle safety switches will
not function properly, and the engine
will cut out in the idle position.
NOTE: If cable free-play gap is not
correct, rotate each adjuster an
equal amount until recommended
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
switches will be activated prema-
turely and the engine will not start.
Fine-Tuning Pilot Air
Screws and Idle Speed
Screws (External)
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 rota-
tions ± 1/4 turn from the seated
position as an initial setting.
3. Install the air-intake silencer boots
taking care that the boots are properly
positioned and that the boots are not
"folded" in the air-intake silencer
causing a restriction of air flow.
40
0741-518
carburetor
safety
4. With the snowmobile on a 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.
NOTE: Make engine idle adjustment
only after the engine has reached run-
ning 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 should be
within a range of 1600-1700 RPM.
! 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 several
times. The lever must return to the
idle position quickly and completely.
! WARNING
DO NOT operate the snowmobile
when any component in the throttle
system is damaged, frayed, kinked,
worn, or improperly adjusted. If the
snowmobile is operated when the
throttle system is not functioning
properly, personal injury could result.
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