Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 181Get this manual
CLUTCHING Effects of Driven Clutch Spring
Increases in driven clutch spring preload will raise engine speed before the clutch starts shifting, allowing the clutch to backshift more quicklyDecreases in driven clutch spring preload will result in faster upshift, but will also slow backshift, thereby lowering engine RPMIt is important to note that engine drive clutch calibration should be used to control engine speed rather than driven clutch spring preloadLowering RPMs by decreasing driven clutch spring preload will result in belt slippage on accelerationIncreasing RPMs by increasing preload will result in excessive drive belt wear and decreased transmission efficiencyRefer to the chart on page 4.9 for available driven clutch springsExperimenting with these springs will allow you to find the most efficient combination of side pressure and back shifting for your application