Polaris 2008 Scrambler 500 4X4, Owner'S Manual

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80
MAINTENANCE
Carburetor
IMPORTANT: Your Polaris ATV is calibrated at the factory for
optimal performance at altitudes ranging from zero to 6,000 feet (1800
m) and temperatures of +40 degrees F. (4 degrees C.) or higher. Above
6000 feet (1800 m) the engine air/fuel mixture becomes overly rich and
the engine loses approximately 3% of its power for each 1000-foot
(304.8 m) increase in elevation. Although this power cannot be
regained, adjustments to the carburetor and drive system can be made
to allow more efficient operation. Optional jets, available from your
Polaris dealer, are required for operation above 6,000 feet and
temperatures below +40 degrees F. (4 degrees C.)
NOTE: Continuous operation of the engine without proper jetting
when required can cause poor performance, overheating and
engine or PVT damage. See your Polaris dealer for more
information about jetting the ATV for conditions in your area.
If the engine idle speed is not satisfactory, and all other conditions are
favorable, the carburetor can be adjusted.
1. Warm up the engine by running the
vehicle for approximately five minutes.
2. Place the transmission in gear and engage
the parking brake.
3. Adjust the carburetor idle screw (1) either
in or out until the desired idle RPM is
reached. Refer to the specifications
section beginning on page 110 for the
proper setting.
NOTE: Turn the screw in (clockwise) to raise
RPM. Turn the screw out
(counterclockwise) to lower RPM.
1