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NOTE: If cable free-play gap is
not correct, rotate each swivel
adapter an equal amount until
r e c o m m e n d e d f r e e - p l a y i s
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,
carefully rotate the pilot air
screws clockwise until lightly
seated.
! CAUTION
Do not force a pilot air screw
when rotating it clockwise; dam-
age to the pilot air screw needle
tip will result.
2. Rotate the pilot air screws
counterclockwise the exact
number of rotations ± 1/4 turn
from the seated position as an
initial setting.
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
" f o l d e d " i n t h e a i r- i n t a k e
silencer causing a restriction of
air flow.
MAINTENANCE
4. On some models, install the
baffle/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.
! WARNING
733-081C
DO NOT stand behind the snow-
m o b il e o r n e a r t h e ro t a t i n g
track. NEVER run the track at
high speed when the track is
suspended.
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 throt-
tle 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)
a n d t h e i d l e s p e e d s c r e w s
(equally) until the engine runs
smoothly.
NOTE: If a tachometer is being
used, 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.
47
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