RESOLVED
Okay--good news. The problem is solved (at least mostly), and in the process I have discovered the greatest substance ever to find its way to a carbureted engine. I called an old man that lives not far from me, who is one of these guys who has ridden motorcycles for 50 years-literally. He confirmed that if there is gas running out of any part of a carb, into the engine or onto the ground, it can only be a float issue. So I cleaned the heck out of the needle and seat and bowl, and it fired up, but still ran like crap--wouldn't idle and was still flooding like it is running rich. But no more gas out the hose. So then the old man said--"wait and I'll be there and fix your problem." He had some stuff in a steel can called "Sea Foam". Siad you can get it just about anywhere (although I've never seen it!) We poured 4 ounces into 1.5 gallons in the tank. He said "go ride the hell out of it, because the problem is you have junk in the idle jet, and the Sea Foam will take care of any gunk or trash anywhere in the carb." I was a bit nervous about riding it since it sounded like hell and didn't want to idle, or to restart for that matter if it did die, but I rode it down the highway for about 10 minutes and came back, and kiss my butt, the thing is running like a dream. I have never seen anything like it. He said "yeah, I used to go through a lot of cans of carb cleaner, but I started using this stuff about 10 years ago and I don't think I have taken a carb apart since." Crazy. So, apparently, despite my best efforts to clean it out with carb cleaner, there was still some kind of issue with junk in the gas/carb.
Easy, thanks for the explanation of the vacuum line to the petcock. You are going to laugh, but I went and tried it--I put the long drain hose on the petcock vacuum line spur, took the main fuel line off, and turned on the gas. A little gas still did come out, but it was not a stream like when I turned it to PRIME. Then I sucked on the vacuum line I had put on it, and low and behold, the gas flowed free JUST like it was on PRIME. Good to know.
Thanks for all of you help and commentary. We'll see how it does after I ride it a while. I still need to see if it will idle worth a flip when it is cold.
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