os 7D
I got my nelson from perf. spec. They put an os 7D on it and said thats the only carb that will work. It works fine til it heats up then the barrel sticks. Maybe i am running too hot or something but it locks up tight until it cools off. I was going to try a jett red carb and see if that works but havent tried it yet. Dont even know if it fits.