2005 Polaris Sportsman 400/500 Service Manual, Page 160Get this manual
CLUTCHING
SHIFT WEIGHTS
Shown below are optional shift weights which may be used in the PVT systemThese shift weights have many different factors designed into them for controlling engagement RPM and shifting patternsShift weights should not be changed or altered without first having thorough understanding the effects they have on belt to sheave clearance, clutch balance, engagement and shifting characteristics