I had experienced difficulties with my setup using a BG SpeedDemon carburetor. My problems disappeared after working with Don Gould from FBO Systems,
http://www.4secondsflat.com/. Ultimately, I had to sell my 750 and replace with a 650 baselined for my application by Don. What a difference! No tip-in bog, it fires up and idles on its own within seconds, throttle response is incredible, power band definitely opened up and no bogging. I can't express how happy I am with what Don was able to do for me.