2004 Polaris Pro X Factory Service Manual, Page 294Get this manual
ELECTRICAL Changing the Timing curve
This engine is jetted for operation at degrees _F and warmerRe-jetting is required for temperatures colder than 0_F
CAUTION
The second switch is located on the airbox and has seven optional curvesThese seven options are used to match the fuel type and the racing conditions which may vary, depending on the raceThe standard position is "D" and should not be moved unless you are knowledgeable engine tunerPosition (Standard Position) Timing Effect +3 +2 +1 2 3 4