I did not read that you replaced the spark plug. It could be fouled after the backfire issue. Seems like whenever I have backfire issue, I adjust or rebuild the carb, always replace the plug and they fire up for me. I would replace the plug with a new one and try again.
Cub Cadet 123
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Still don't know what I'm doing in OHIO?.....If you find me, then please point me back toward INDIANA. 
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