2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 109Get this manual
FUEL SYSTEMCARBURETION pilot screw adjustments and PVT adjustments may be required to suit operating conditions
CARBURETOR JETTING
CAUTION: main jet that is too small will cause lean operating condition resulting in serious engine damageSelect the correct main jet carefully for elevation and temperature according to the charts Chapter specifications or in the Owner's Safety and Maintenance Manual for each particular modelIMPORTANT: The following guidelines must be followed when establishing main jet setting: 1Select the lowest anticipated temperature at which the machine will be operated2Determine the lowest approximate altitude at which the machine will be operated3Select the correct main jet from the chart on page 1.44Clutching changes may also be required for changes in elevationRefer to clutching chart on page 1.4 for recommendations