Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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When letting out brake on lawn tractor it begins to backfire

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If you have overhead valves, it is likely they are out of adjustment. These overhead valves are notorious for this, even having the retaing nut or the entire stud coming loose, or off. often the pushrod running loose against the guide will wear it entirely in two. Don't get too worried, these parts are relatively cheap, though having them installed and the valves properly set may cost a few bucks. be sure someone experienced with this problem does the repair or the valve will continue to come loose. This may not be your solution, but with backfiring, valves or ignition timing. Generally those two are the culprit. Yours backfiring under load makes me lean towards the valves.

Posted on Oct 16, 2009


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