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That is what I am thinking.  The jet, needle and everything is clean and clear, but I am concerned that I could not hear the float rattle when I shook it after reassembly.  Seems like I should be able to hear it move.  Before, it may have been partially open allowing the bowl to fill after an hour - so it would start and run great for 30-40 seconds and not restart.  Guess I will have to try a 3rd r&r.  A big problem is that the drain port was never drilled out in the casting so I can't open and test it.  Think I might do that this time.

Thanks I will check the hoses.  Could the cold enrichment solenoid be a factor?  It seemed to be functional when I tested it, but might be binding on the passageway.

I can see how a clogged jet could keep it from starting, or idling smoothly, but it idles fine for about 40 seconds on this last try and then won't keep running on restart until a sufficient rest period.  Perhaps the issue might be more related to float needle or enrichment solenoid?

I am trying to get a couple of scooters that sat for 10 years ready to sell for a cousin.  This is a 125cc with 5 miles on it, so I am pretty sure it had fuel in it at one time.   I flushed fresh fuel through the lines.  It wouldn't start, so I removed and cleaned the carb.  The idle mixture was originally about 1.5 turns open.  The enrichment solenoid was working when I tested it while cleaning the carb.  I put it back together and it started right up, warmed up normally and I rode it for about 10 miles.  It ran great.  I put about an oz of Gumout Carb Cleaner with a gallon of gas in the tank and let it sit while I worked on the 2nd scooter.  Since then I have not been able to get it to warm up.  It starts immediately and runs smooth for about 25 seconds and then starts to slow down and die.  It may restart at that point for 5 seconds and then dies again.  If it sits for a while, it will start back up fine for another 25 seconds...

There is fuel in the filter.  I have tried bypassing the vacuum petcock, removing the tank cap, all with the same results.  Fuel flows out of the line when I crank the engine so I think the petcock is fine.  I drained the Gumout fuel and replaced with fresh 93 octane to see if that would help. 

What am I missing??

Thanks, for the tip crwford .  I did a little searching and found that to be a frequent comment, which could explain why it was running well and then nothing.  Stator VAC exciter output is way low.  I presume that if the alarm was preventing the engine from starting, it wouldn't effect the exciter output.