The motor we will be discussing here is a 4.5 hp single cylinder motor marked on the rear of the cowling as 45. These single cylinder Mercurys were in production in one form or another since the early-1960's.
Mercury MerCruiser 4.5L 250 HP Inboard, Sterndrive 2015 A 6-cylinder sterndrive power plant has been released by the folks in Fond du Lac, Wisconsin. This new, purpose-built 4.5 L marine engine is made by Mercury Marine which has full control over its production.
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