Quote: I cant get it to run for any amount of time with the choke flap closed.
Fuel side of equation…
Perfect world with choke operating as designed:
During a cold start(first start of day) choke has to be fully closed, but as soon as there is vacuum choke will crack open 1/8 to ¼ inch (depending on carb) for engine to continue running. If after a cold start one were to open choke flap by hand before engine has run for 60 seconds or so engine will stall from lean mixture.
Quote: I could crank and crank but without giving it fuel, it would not start. If I gave it fuel, it would start but run like garbage
If I disconnect the choke and leave the flap open, I can get it to start by giving it fuel but if I come off the fuel it sputters and subsequently dies.
This is normal, by pumping accelerator, accelerator pump is dumping enough raw fuel onto manifold creating an inconsistent rich condition for engine to stumble along, and as explaned above once pumping stops engine leans out, and stalls.
Quote: The carb base gasket was wet,
This could be from incorrectly torqued bolts, but more likely all that pumping wet down throttle butterfly, and fuel oozed out along shaft wetting base of carb.
Aside from internal carburetor problems such as dirt, sunk float, I suspect that you flooded the engine. Flooding during warm weather often can be overcome by holding throttle wide open, and turning over engine for a bit to dry plugs enough to once again fire. In cold weather plugs don’t dry very fast, and require removing them from engine to be dried. It doesn’t take much to flood a real cold carbureted engine practically if the carburetor is out of adjustment, is a high mileage unit, or has sucked up some crap from the fuel tank.
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