Kaw 650 Not starting?!?!?

I have a head scratching problem with my Kaw 650. Once you get it running it will run fine and with plenty of power. Normal if you will. Once you turn it off you have to crank on it forever to get it to run again. To the point where it completely kills the Batt. I have totally taken the carb apart thoroughly cleaned it. New plugs. Has great compression and spark. The fuel pump looks great. What could it possibly be? Any suggestions would be great.

Thanks,