Just a shot in the dark here but when you rebuilt the carbs if you got the floats off, or not seating properly then you could flood the bowls after shutting off. Given time to "cool down". During this "cool down period" the excess gas could drain out or evaporate out of the bowls.
A possible test.
petcock on, start and run until warm. while still running turn the petcock off and allow to run out of fuel killing the engine.
Now reopen the petcock. Realize that it will take a bit of cranking time to allow the vacum diaphragm in the petcock to allow enough fuel to refill the bowls. My bike can take eight to ten 3 second starter sessions to get enough fuel past the vacum diaphragm in the petcock to refill the bowls.
If engine restarts (may run rough the 1st 30 seconds as the bowls finish refilling) while still warm (allowing for the effort of refilling the bowls) then I would suspect the floats or their seats.
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Last edited by Spencer1; 03-04-2014 at 01:17 PM.