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Lt 2000 craftsman lawn tractor popping noise by muffler?

All of a sudden my mower started making a popping noise in the engine but it sounds like its up front of engine. You can hear it popping out of the muffler
marlin hines, May 2009
Change spark plugs
One may not be firing and letting fuel get to the exhaust where it fires creating the pop

Bcran1, September 2016
link Click here to see other fixes for Craftsman LT 2000.