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So if the float bowl fills too much then the initial draw at the start is too rich putting raw fuel into the exhaust? And also, is this an indication of a float valve problem?
It's quite likely the floats are slightly out of adjustment allowing a slight overflow into the intake and this is the source of the backfire. It would be a very small amount of fuel that would evaporate when the engine is warm so you'd only notice the problem cold. Closing the petcock when parked is the best diagnosis.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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