On the Woodruff key locking the flywheel to the crankshaft, it has to be perfect. Even a half sheared key will cause ignition timing problems BTDT and other than what I am going to say below, it usually is responsible for backfiring....unless you have a leaking intake valve.
Can't say that a sparkplug helped or didn't. You know when you are trouble shooting you just keep on till you fix the problem and I just don't remember on the plug; but I wouldn't rule it out and if worked for some folks then there is another option.
I had a Kohler of about 16 hp and it did not have a fuel shut off on the carb. If I finished mowing and left the throttle at normal rpm, it would shut down normally and about 2 seconds after it stopped running it would let out with a great big bang.....just one. However, if I shut the throttle down to idle and let it run for a minute or so and then turn it off it wouldn't do it.
On later mowers I had, Kohlers also, there was a shutoff (wire coming out of the side of the carb) and I never had one backfire regardless of the throttle setting nor temp.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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