Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 67Get this manual
ENGINE Changing the Timing curve
CAUTION
This engine is jetted for operation at degrees _F and warmerRe-jetting is required for temperatures colder than 0_FTIMING INFORMATION The PRO 440 has been equipped with two switches that will change the timing curveThe first switch is an ignition switch located on the consoleThis switch is used to match the timing curve to the type of fuel you are usingThe fuel types are 92 octane non-ethanol premium fuel and 110 octane fuelDo not run the machine in the wrong ingnition key position or engine damage may occur
CAUTION
Mis-use of the timing selector switch can cause serious engine damageRunning the machine in the wrong ignition key position may cause engine damage