2005 Ski-Doo Racing Handbook, Page 35Get this manual
SECTION 03CHASSIS PREPARATION
Dual Rate Spring Formula
Spring Spring -SpringSpring 2
A Dual Rate Spring will assume the rate of the heavier rate spring when the lighter spring bottoms or coil bindsExample: Spring 100# Rate Spring 150# Rate
Free opening angle
100 150150060 100150 250
Spring was 100# Rate separately, but when stacked on the 150# spring (spring 2), it now has 60# rateAs the spring bottoms or coil binds, it will assume the 150# rate of spring 2Load Load
Torsional Springs