i got a 30mm keihin carb 135 main 50 pilot and im actually going to trade for a stock friday and tomoro im puttting my friends stock carb on mine and make sure it will make it better befeore i trade....... my bike has no powerband and it just goes burrrrp burrrp burrrrp lol on my friends i feel powerband with his stock carb on his and the fmf phatty gold series mine has an old gold series why dont i feel POWER BAND????