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What are some possible causes for oil fouled spark plug on lawnmower engine?

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Answered 2012-05-13 20:25:02

Three possibilities. Overfilled with oil. Worn cylinder or rings. Worn valve guides. On most smaller engines, it's cheaper to replace the engine or the short block. If the engine has overhead valves and the valve guides are worn, a short block won't fix the problem.

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