2005 Ski-Doo Racing Handbook, Page 47Get this manual
SECTION 03CHASSIS PREPARATION
As mentioned earlier, the configuration of the shim stack will control most of the dampening of the shockThere are several methods to tuning shim stacksThe first and most commonly used is to increase or decrease the overall stiffness of the stackThis can be done by changing the number of large shims or by increasing or decreasing their thicknessSTIFFER SOFTER
Dia(mm) Tickness 30 .203
Dia(mm) Tickness 30 .203
18 18 16 15
.203 .203 .203 .203