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Hoping someone can identify my problem with popping/backfiring and producing a gas smell So here is the symptoms and data 1. Engine is Briggs 44R677 0021G1. The carburetor is a nikki-6 model 796227 2. Backfiring is through the muffler 3. Valve clearance is good at .004 to .006 per the mfr...

Hi all I am having a problem I can't figure out. My briggs V twin with the nikki 6 carburetor has been backfiring and smelling like gas. I replaced the carburetor, changed the gaskets on everything, set the valve clearances, replaced the fuel filter and air filter, and the problem got worse...