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What to set valve adjustment on a 20 HP craftsman lawn tractor?

adjustment craftsman HP lawn mend it tractor valve
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What to set valve adjustment on a 20 HP craftsman lawn tractor?

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I have a 20 Hp electric start Automatic transmission Craftsman Lawn tractor. Model#917.271920. It will backfire while I am mowing it will also surge.I have changed filters,repaced spark plugs. Drained gas tank.

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