Is the pilot jet the only fuel feed to the choke circuit?

[Darkstar]

It won't start with choke on full, but it starts right up with throttle wide open, and after it does it idles and runs great with no hesitation at all right up through the powerband. The interesting thing is that after I start with throttle wide open, then lower RPM to 2000, and let it run for 2-3 a few seconds, then kill the engine, it will then start up with choke on as expected. It's puzzling because this didn't warm the engine up, so why would the behavior change? I'm thinking about the choke circuit, that it may be clogged. I thought this circuit starts at the pilot jet, which feeds fuel to it through a bypass passageway. Is this right? If it is, then the jet isn't the problem, because the engine runs smooth from idle up through 1/4 throttle, using the pilot jet, right? Wish I had a cut-away diagram of the carbs to see. Im wondering if the bypass pulls fuel directly from the float bowl through something other than the pilot...

UPDATE: it ignites if I choke start cold, but only if it's set to the half way point, but it doesn't stay running. Maybe it's not getting enough air to match the fuel a full choke supplies?