I was in the middle of cutting the grass when the mower started to backfire and run slugishly. also sounded like it blew the baffels out of the muffler; have cleaned the spark plug and air filter.

Can't keep mower running for longer than a minute anymore. not sure what to do. was running perfect and then it all went downhill. never hit anything while cutting, just started doing this out of the blue

★ ★ ★ ★ ☆ 4.0 stars


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You have a partially sheared shear key on the flywheel,get a new shear key and pull the flywheel and replace it, How to replace sheared flywheel key on Briggs Stratton walk behind lawn...

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