We decided to bite the bullet and pull it apart then and there. We found
some "crud" in the bowl and also some in the needle that controls the float.
We have since installed an in-line fuel filter and the intermittant problem
seems to have vanished.
Check for dirt in the carb. Change the filter. If you rebuild the carb, be
very careful with the replacement parts. On mine, some of the jets included
with the kit were incorrect. It ran better when I replaced the old jets!
Let us know what you find
Jeanne