I am running the same class and I use a Horstman dry clutch. I use the three -disk and it is not worth the money. A two disk dry clutch is the way to go. I would say to use either a Patriot clutch that is made by Comet Kart Sales or a Tomar clutch. The TD-23 (Tomar) is what most people in Yamaha run. We had a racer this weekend do the same thing that you did with the same clutch.