I just rebuilt my motor, bored over twice since new sleve, ported and polished the motor, it has an old fmf also. right now its got a 165 main and a 45 piolit and the clip on the 2nd slot from the bottom. I have already tried a 160, 168 and 170 main and they all ran horible. The bike runs alright at quarter to half throttle but once it gets above that it just starts sputering and i cant figure it out. No shop within 30 miles of here will work on it because its been ported so now im screwed. any help would be greatly appreicated. thanks