2005 Ski-Doo Racing Handbook, Page 33Get this manual
SECTION 03CHASSIS PREPARATION
Contrary to popular belief, it is not necessary to have the skis feet off the ground to achieve good weight transferIn fact, the energy used to lift the front of the vehicle is not available to push the vehicle forwardThe main function of the rear arm is to support the weight of the vehicle and rider, yet provide usable travel to absorb bumps and jumpsThe springs are chosen depending on the linkage design of the rear arm and the intended load to be appliedStiffer springs will be used on vehicles intended to carry heavier loads and on vehicles that plan to encounter large bumps, while vehicles used for lighter loads and on smaller bumps will use softer springsSprings for the front suspension are chosen in similar fashionA softer spring will provide less ski pressure and will be used on lighter vehicles while stiffer springs will provide more ski pressure and be used on heavier vehiclesNOTE: Shock absorber valving and the type of shock used will also affect weight transferRefer to the shock absorber section for details