This issue can be the cause of many things but ususally doesn't indicate any type of engine problem. All of my toys backfire on deceleration due to :less restictive muffler,insulation removal or deterioration. The backfire is simply igniting unburned fuel gases still in the pipe or muffler. Think of a safety gas can or fuel cell- the addition of foam or like product doesn't allow the fuel/air mix combined with heat to combust as easily- that's the same thing the sound insulation does in a muffler.
Last edited by metalstudman1; 08-05-2012 at 01:51 PM.
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