2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 193Get this manual
RELATIONSHIP OF DRIVE CLUTCH WEIGHTS AND SPRING IN MAINTAINING OPERATING RPM
The drive clutch is an RPM sensing unit designed to transfer the maximum amount of horsepower from the engine to the groundThis is accomplished through weights and spring inside the unit which react to the centrifugal force applied to the clutch from the engine RPMThe spring and weights work in combinationIn properly set up clutch, the maximum desired operating RPM will be reached immediately after clutch engagement, under full throttle conditionsTo gain optimum power this RPM should be maintainedAs centrifugal force pushes the weights against the rollers, the moveable sheave will force the belt to climb up the drive clutch sheave and increase vehicle speedIf the weights and spring are matched properly, the engine RPM will go to the desired range and remain there on both the upshift and backshiftExampleEngine Operating RPM 6000 "200