Roebuck Tecumseh

I need help finding a spark plug for a craftsman mower more.?

I know the engine is a Tecumseh, but I do Can not find a model number. The mower itself is a Sears and Roebuck Craftsman model 917.383030, Lot No. M120589, and serial # 021690. Any help would be greatly appreciated. Thank you

How many horses is the engine? I have a craftsman with a 6.75 hp Tecumseh, and mine takes a RN4C Champion (104) or N4C (803). Hope this helps.

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