BIKE FELL = STALLING ENGINE

[fa11enzer0]

Thanks to my bike cover acting as a parachute, during a wind storm my '07 GZ250 fell onto it's right side. First it took forever to get it running, but now it will start, but it won't keep running. I took it around the block a couple of times, but when i slowed to take turns, it would cut off.
I noticed that somehow my petcock got moved from 'on' to 'pri' which i know was not a good thing, but so far we have tried:
-unhooking the fuel tank all together and burning off the gas in the carb
-unhooking the vacum and fuel line and letting them air out over night
-checked spark plug (though it was a little black on the end, it doesn't seem to be the issue)
-and of course, putting the petcock back to the 'on' posisiton

I'm sure it is an issue with the float, but i'm worried about messing up the bike. I haven't had it for a year yet and i'm wondering if i should just take it to the shop to see if the warranty will cover any issue it might be. Also, at this point, it would be a month or so for service and I would like to ride this spring...so maybe it wouldn't be bad doing it myself.

Any advice here would be great. I don't know what else may create this issue after falling over.