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This mower was running fine , I drove into the garage after mowing a medium lawn , shut it off and it was never to run again. Crankshaft would only rock a little with channel locks and yes it has oil in it before and after. Replaced ten horse with a thirteen horse brigs sinngle out of a Toro Wheelhorse 1338, mine was a 1038 and it ran for about a hour and then backfired , then would not restart. Let it cool overnight and then it started this morning . What would cause the backfire and then no restart ! Help?

Hey boon! WELCOME to LawnMowerForum! :biggrin:

I moved your thread to the Small Engine & Mower Repair Forum. You'll get a better response there and be on your way to healthy mower again. :thumbsup:

Sounds like a magneto prob to me. You need to check for spark right after it dies and it will show if that is the problem.