Polaris Trail Boss 330 Quadricycle - Manual (Page 80)

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MAINTENANCE AND LUBRICATION
Carburetor Idle Adjustment
IMPORTANT: Your Polaris vehicle is calibrated at the factory for
optimal performance at altitudes ranging from zero to 1800 meters and
at temperatures of 4 degrees C. or higher. Above 1800 meters the
engine air/fuel mixture becomes too rich and the engine loses
approximately 3% of its power for each 300 meter 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 and clutch components, available from your
Polaris dealer, are required for operation above 1800 meters. Jetting is
required only when operating below 4 degrees C. at 1800 meters and
lower.
NOTE: Operating the engine with improper jetting can cause poor
performance, overheating or engine damage. See your
Polaris dealer for more information about jetting.
If necessary, the carburetor can be
adjusted.
1. Place the transmission in neutral.
2. Lock the mechanical parking
brake.
3. Operate the engine for about five minutes.
4. Adjust the carburetor idle screw (1)
clockwise to raise RPM or
counterclockwise to lower RPM.
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