Carb gas inlet fell out, bike started 4 stroking!

I have a speed carb, and the other day when i was riding the little brass hose barb that the fuel line goes onto completely fell out of the carb case! At the time i didn't think it would be an issue, so i just tapped it back into the carb, reattached my fuel line and started riding home, but the engine started 4 stroking really bad at above 3/4 throttle. I had the carb absolutely dialed in before the hose barb fell out, and i cannot think of any reason why that would change way the engine runs!

2door, Thank you so much! The brass nipple on my carb doesn't screw in, it has no threads whatsoever on it. It is perfectly smooth all the way around. But now that i know that it is the valve seat i can adjust it somehow to get my carb back to normal.

Mine had no gasket either! I can adjust the valve seating position by working the nipple in and out, and when i find the proper position i can epoxy it in place.

I had some time to work on my bike today, and i fixed the carb problem. It was a simple matter of threading the nipple and the carb body, adjusting it so that it was running properly, and a drop of superglue on the threads to seal it and keep it from moving.