Mike, I agree, replace the plugs just to say you did.
I wasted $100 and many hours frustration on a Kawasaki mower engine once, all it needed was a plug!
But as to why they will backfire like that, the plug was bad enough it wouldn't fire under compression, but would fire on the overlap stroke. Since the plug fires every time the magnet goes by the coil, it fires on overlap, and will set off residual gas in the cylinder when the intake valve is just starting to open, giving a pop out the intake and sometimes out the exhaust.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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