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 - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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