I use Horstman Greased Lighting on kart minimum weight 410 lbs (I add 45 lbs to make weight). Works well with stock Animal, but I am thinking it's not going to last very long with your engine.
I think Horstman is phasing this clutch out, so my class to going to Noram Cheetah clutch, a clone of the Horstman Greased Lighting, for less $'s. :thumbsup: