Well after that rant from earlier this afternoon, I made it home safely, if still frustrated and cranky about my scooter's misbehavior. And I found the problem. The main jet in the carburetor had worked loose in the base! That's right, it was running rich, really rich, from fuel being sucked in arounf the jet, instead of through the jet!
Good grief!
So I've down sized the jets back to where I was a few weeks ago and I leaned a little harder on the screwdriver this time.
I also decided to correct the too-small flange connection between my intake manifold and the cylinder head. On one half of the cylinder head flange, the width of the flange is only about 1/8". I'm going to take it to the machine shop and have some welding and machine work done done to make the flange wider. So, I've got the head off and going to the shop tomorrow.
I'm glad I found the (maybe, a) source of the failure to operate this evening. I'm still cranky about the regularity and the number of times dumb failures like this occur. I"m to blame for this one, since I did have the jets in and out but that doesn't really fix my crankiness.
I'm just glad I'll have the scoot back together in a day or two.
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