Arctic Cat Z Series 2006, Operator'S Manual

Page: 48 / 88

MAINTENANCE 47
733-081C

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.
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
“folded” in the air-intake
silencer causing a restriction of
air flow.
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.

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)
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.
! 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-
m o b i l 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.
! 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.