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Fuel Starvation. Your choke only brings fuel to a carb that has no fuel to it. Once the fuel is initially delivered (it fires off) it's the fuel supply system's job is to keep it there, not the chokes. The choke (if working) is forcing your venturi to "suck" more fuel indicating it isn't sucking enough to satisfy the current engine speed. You are indicating that the latter is not happening. It is important to understand that we are addressing a continuous problem of fuel starvation, vs a machine that will run on it's own and then die. The former is fuel air ratio too lean caused by needle valves screwed in too far or obstruction in venturi delivery. The latter would be considered running out of gas which would be a supply problem i.e. fuel inlet port not matching old delivery port, piece of foreign matter in supply line. filter screen plugged up, float misadjusted or operating incorrectly. I think it is too lean a mixture and would start there. You surely have a low speed adjustable jet and could also have a high speed. I'd start with both set to somewhere around 1 to 4 turns open. When seating, do so with your fingers, not a screw driver so as to not damage brass seat. I'd start with the low at 1 1/2 turns open and the high 3 turns open. Then via trial and error optimize the setting. The engine will tell you when you hit the sweet spot. If not come back and talk some more. Good luck
Mark
FYI: Quick way to check delivery, is to drop the bottom off the carb, or bowl and allow the float to hang down. Then open the tank supply valve and you should see a pretty good stream of gas running out on the ground (more than a trickle).
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