Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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Back fireing 22hp v-twin briggs, run but back fires all the time it's running. is this a valve or damaged flywheel key problem?

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I dont think that it would keep running if it was a damaged flywheel key? Seems like eventually it would go on and slip too much. But a leaking valve sounds like the most logical answer. Take the spark plugs out and stick your finger over each cylinder and turn it over. see if one of em has more compression than the other. If one is take the valve cover off that one. and see if you can see a week spring or something.

Posted on May 11, 2010

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