Re: new engine start-up problems
Another long shot, there were a couple of post about timing gears being mismarked. Not sure if they just thought they were mismarked or they actually were mismarked.
I don't remember, but have you run a compression test? A valve sticking might lead to a backfire.
Also, depending on the carb type, a backfire can damage the power valves and cause them to leak.
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