2004 Ski-Doo Racing Handbook, Page 138Get this manual
SECTION 05DRIVE SYSTEM
In clinical condition such as on dynamometer, moving the adjusters up will result in 150 to 200 RPM increase with each position changeLowering the adjuster positions will result in decrease of 150 to 200 RPM with each numberOn the snowmobile, however, depending on the operating conditions, change of one adjuster position may not show up on the tachometer, but the shift speed of the pulley will have changedThe upshift or downshift, depending on which way you moved the adjusters, will be faster and your acceleration rate and top speed will have changedWhen using the TRA adjusters, the acceleration rate and speed should be checked as well as the engine RPM