Arctic Cat Bearcat 570 2012, Руководство оператора

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40
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.
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.
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 should be
within a range of 1600-1700 RPM.
6. Test the throttle control lever by
compressing and releasing it several
times. The lever must return to the
idle position quickly and completely.
Calibrating Main Jets/
Pilot Jets/Jet Needle E-
Clips (Internal)
Altitude, temperature, and the use of oxy-
genated gasoline affect the carburetion
needed for optimum engine performance.
The carburetor main jets must be
changed in conjunction with changes in
operating altitude, oxygenated gasoline
usage, and temperature. Also, the pilot
jets and jet needle E-clip positions may
have to be changed with changes in oper-
ating altitude. To change pilot jets and E-
clip positions, the carburetors must be
removed and disassembled (float cham-
ber, etc.). Arctic Cat highly recommends
that this service be done by an authorized
Arctic Cat Snowmobile dealer only.

NOTE: The following internal car-
buretor calibrations may be done by
the snowmobile owner if qualified to
do so. If the owner does not feel
qualified, take the snowmobile to an
authorized Arctic Cat Snowmobile
dealer for this service. This service
is at the discretion and expense of
the snowmobile owner.
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 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.
CAUTION
For information on altitude operation,
see Varying Altitude Operation sub-
section in this manual.