Tom,
In our experience, the only reasonable clutch to use for sprint racing on a kt100 is a patriot 3 disc. If your class weight is over 300 lbs, the two disc wont live. The wet clutches are great for road racing, but has far too much drag for a sprint track. After destroying $2000 worth of two disc clutches last year, then getting 6+ events out of the three disc clutches before friction disc replacement, I’d have to say the patriot three disc is the way to go.
Josh Martin