1998 Roadking FLHR. Was leaking fuel in carburetor. Put new kit, it stopped the leak now it’s backfiring through carb?
Put kit on it? What, exactly, would that cover/include? Here are some CV carb rebuild videos in the related videos below. See if they help at all. Also, If the m/c is coughing through the carb, it can be a carb or intake issue. Backfiring is more indicative of an electrical issue. Test your charging system and check your coil connections/spark plugs & wires. Check for dead shorts in your ignition circuit.
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