my friends shee breaks up on top end only, heres the mods, coolhead w/19cc domes, 60 over wisecos, +4 timing, toomy T5's, reed spacers w/rad valves, pro flow filter kit, and mikuni 28mm flat slides with, 40 pilot(bottom end and mid is strong), needle positions unknown, and 300 mains. The bike runs very strong except the top end, he usually runs 114 race fuel also but top end
still breaks up. what do you guys think?