ok a list off my mods: no air box,34mm carbs,pro design intake, v-force II reeds, port & polished, bored .60 over, shaved head,fmf fatty w/ power core 2 sliencers. ok now i just recently got the (port & polished,shaved head) and it seems to run the same if not slower. it sputter in mid end and not wide out as long. i was askin around and some people said it may be the timing key. what do you guys think i need to advance it. input would be appriciated,thanks