it works great, but the jettin was toooo big, i jetted it down, but the bottom ports look to be milled out, cuz from the bottom, it deff dont lookin like not 650. ive only ran the carb personally bout 3 times, i just am stuck on the the 650 is too big for this engine, dont ask y, i just am, im really particular bout fuel delivery systems, i hate runnin gas out the tail pipes and flooding an engine. maybe we could meet up at bradenton motorsports park one time, and u can run it and see how u like it. the jets i put in it r 57s, it had sum like 70s in it.