I have spend MANY hours trying to dial my bike in after rejetting to 165 main, 48 pilot, complete White bros exhaust, Uni Air filter, snorkle pulled. No matter what I do, the bike runs the same, strong on the bottom end, sputter at top end. I have switched to 145 main per WB suggestion, I have brought my needle clip back up to stock, I even put the stock header pipe back on as I thought maybe I had an exhaust leak, changed spacers on my pipe a few times, put snorkle back in, rode around with airbox cover off, you name it, I have done it, everything short of going back to completely stock and I have a funny feeling even if I do that it still probably wont run right. I suppose I will just have to bring it to the dealer or White Bros and have them check it out but I really dont feel like paying someone.. Any final suggestions would be welcomed. Last thought, IF that is the rev limiter that I am hitting at high rpm (it feels like a sputter) then I simply have the wrong motorcycle.. I am at the point where I would like to go to the Yamaha dealer and buy a 426.