2005 Ski-Doo Racing Handbook, Page 267Get this manual
SECTION 06DRIVE SYSTEM
Curve shows clutch set up with three 10-gram type roller pinsThis amount of weight will govern the engine to 7200 RPM and allow engagement of the clutch at 4000 RPMCurve illustrates the effect of exchanging the three 10-gram pins for three 14-gram roller pinsThe additional weight has virtually no effect on engagement speed but pulls the peak RPM of the engine down to 6800 RPMCurve illustrates the effect of using three 16gram roller pinsAgain, the additional weight has little effect on the engagement RPM but further reduces the top RPM to 6400 RPMFor example, by adding grams per arm for total weight increase of grams on an engine turning at around 7500 RPM, there would be about 200 RPM decrease in full power engine speed approximately the same effect as going clicker position lowerOn high RPM race engine it may only take gram, increase per arm to see 200 RPM decrease in peak operating RPM