2005 Ski-Doo Racing Handbook, Page 269Get this manual
SECTION 06DRIVE SYSTEM
The weight of the lever arms will have similar effect on the shift RPMBy adding or removing weight to or from the arms, we can fine tune the shift RPM to the engine power peakIf you increase the horsepower of the engine at the same RPM, you would normally add more weight to keep the engine pulling as hard as possible and not over revIf you lighten the weights on the arms, you will be increasing the shifting RPMHowever, your vehicle will not pull as hard, since less centrifugal force is being generated