My 49 starts fine at with throttle at about 1/3. If I increase the throttle, it stalls. However,even if I don't increase the throttle, there seems to be a narrow range in the choke adjustment to keep it running. Once it is going, it runs with the choke half open, but tends to shut off if I open or close the choke. I suspected a fuel flow issue, but when I detach the line from the carb, it flows well. Guessing the problem is in the carb, but I am looking for thoughts on this before I waste time in the wrong place.