Re: backfire.
Yesterday got my truck back from a Model A shop, turned it off, and within a couple of seconds backfired through he exhaust. Got it running again at idle , GAV set full lean,advance lever up - was not running right. Got out and noticed black smoke out of the exhaust. Backed the idle mixture screw out a couple of turns until it started running better - issue solved.
Exhaust was loading up on unburned gas, and was ignited by the hot exhaust manifold.
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