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For a 12.5 hp Tecumseh 4-cycle engine, the recommended spark plug is typically the Tecumseh part number 6400A or equivalent, such as the Champion H10 or H12. Always check the owner's manual or the engine's specifications for the exact spark plug type, as variations may exist based on the engine model. Properly gap the spark plug according to manufacturer specifications to ensure optimal performance.

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1mo ago

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