2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 126Get this manual
SHIFT WEIGHTS
Shown below are the shift weights which have been designed for, or which may be used in the PVT systemThese shift weights have many factors designed into them for controlling engagement RPM and shifting patternsShift weights should not be changed or altered without first having thorough understanding of their positioning and the effects they may have on belt to sheave clearance, clutch balance and shifting pattern