Re: Backfiring
I notice nobody has asked whether you’re using a Zenith carb, a Tillotson carb, a Marvel carb. The Tillotsons and Marvels, being pot metal, have a tendency toward at the mounting flange, causing vacuum leaks, which will definitely have an effect on overall running.
And, while having the GAV adjustment at the choke rod open a full turn is usually way too much for a Zenith, 1/2 to 3/4 turn open for Tillotsons is not that strange.
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