Just wanted to say thanks for the replies. After posting the question I got to thinking about the whole situation, and talked to dad about what happened too. Given what I saw with the idle and timing both being so far off,etc, etc, and the way it was running immediately after I put the carb back on, but before I set the timing and idle speed, I've pretty much come to the conclusion that it as to be carbon deposits heating up and keeping it running. That's really the only thing that makes sense as regardless of wether the throttle shaft was stuck, it had an air leak, etc, etc, it should still shut down when the key is turned off. Not because the fuel or air flows stop, because they actually don't until the engine completely stops turning. Think about it this way. You can put the engine at wide open throttle and hit the key and it will die because there is no spark/heat to ignite the mixture. With a glowing ember of carbon in one, two, or in this case what appears to be three cylinders, the mix doesn't need a spark to make enough heat to ignite it. Give that it will self perpetuate the problem because each explosion will keep the ember hot which causes the next explosion...and on and on.... In that case it's like a runnaway Detroit and the only way to shut it down is to remove all the fuel or completely block off the intake air.
I've already suggested the use of some Seafoam to the guy but I'll give him a call tomorrow and suggest the water mist idea. I've heard it works so why not. Anything is better than having to choke it down every time you want to shut it off.
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