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have you looked at float levels...sometimes a float gets a hole and fils with fluid...sounds like carb is flooding..especially when hard to start when hot

once power valves are shot, they will also cause this backfiring



I'm actually picking up a rebuild kit today, as I do feel that the carb is flooding (while hot). Float levels have been checked and needle and seats replaced. Also power valve was replaced too.

I just wasn't sure I could get a carb fire just from flooding, as it needs an ignition source, which would presumably come from screwed up timing???