the new performance carb, the one with the red filter. It's strange once after a few seconds it runs awesomely and I can go at least 25...I think...or it just seems really fast to me. Lol.
Have you tried moving the clip down on the needle if not try it and see what happens. My Dax RT was doing the same thing today when I put a jet in that was to small. So either try the clip or open up the jet if you can.
Yes that is true what wayne said it may just be cold. However if your jet is to small it will do that, how does it run normally does it struggle at higher speeds if it does I'm guessing its the jet.