Polaris Sportsman 90 Motorcycle User Manual


 
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MAINTENANCE
Carburetor Adjustments
If the vehicle is to be operated at various altitudes and temperatures, certain ad-
justments can be made to improve its operation and driveability. Above 6000 feet
(1800 m) the engine air/fuel mixture becomes overly rich. An engine loses
approximately 3% of its power for each 1000 foot (304.8 m) increase in elevation.
Although this power cannot be regained, changes to the carburetor and drive sys-
tem can be made to allow efficient operation. These changes include:
1. Carburetor re-jetting to compensate for altitude and/or temperature changes.
2. Transmission convertor modification to adjust for engine horsepower loss during
high altitude operation. Contact your dealer.
3. On 2 cycle models, air screw adjustments can be made to compensate fortemper-
ature changes and/or changes in altitude.
NOTE: Contact your dealer for altitude adjustments. They have the training and
special tools require d to perform all necessary modifications for you.