Quote:
Originally Posted by C&O2-10-4
Recently my CCC 3240 would backfire when I shut it down, ( I do throttle down before I turn it off); anyway I was mowing the other day for several hours and all of a sudden it just quit, I believe I heard a pop when that happened. I can't get it started, could I have a bent engine valve ? cannot see anything wrong, no oil, or crack in the engine block.
C&O2-10-4 
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Does it have spark? Air filter good, fuel to the carb? Check these first, then a compression test if the basics check out.