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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