quadrider32

So just swapped my motor in my runner. Had a worn out 22r that eventually threw a wrist pin so I swapped the head off it and put it on a EFI motor I had laying around. The whole swap went smooth...motor fires right up, idles mint and has the power in the low end but starts doggin when you get on it. Im pretty sure its the carburator but I have no idea. Its a Weber and im not to sure on how its suppose to be set up but does anyone have any other suggestions on what it might be?

Thanks
-Cam