i have a 89 banshee with stock carbs tors removed, fast play dune port, kn with no lid on air box, cool head 20cc domes, timing plate +4, and fmf gold series pipes. I had 280 mains in it before, when all I had was the pipes and kn on it and it seemed to be about right. I have put 27.5 pilots in, and need help picking a main to start with. My elevation is about 1000ft. Thanks