The Clutch 'pack height' on a GG Pro model from "02 to "07 is critical for a correct working clutch. The clutch consists of 3 x fibre plates and 2 x steel plain plates and the total width of this pack must be between 9.75mm and 9.85mm. If the pack is undersized then the clutch will slip. If the pack is oversized then the lever will be stiff (which some riders prefer). You can adjust this pack height with the steel plates because there are four sizes to choose from, 1.3mm/1.4mm/1.5mm/1.6mm.