OK Guys. Sorry to rehash a topic, but I just installed a 270 big bore kit from cylinder works. Prior to installing, bike started 3-4th kick and ran perfect idle to rev limiter. It smoked a little off idle but nothing terrible After I installed the big bore, it fired up 1st kick. Idled perfect ran perfect up to 1/4 throttle. Also, it doesnt smoke anymore. So I go on it a lttle after 1/4 throttle and now it pops and cuts out 1/2 to 3/4 throttle..... Thoughts or suggestions. Also. I checked my valve cleranaces to perfect when I put everything back together.