2016 Mercury Marine FourStroke 150 hp (20 in) Forget everything you know about four-stroke outboards. Ours change the game. Completely. Theyre tougher, smaller, and lighter than any other four-stroke on the water. With a combination of performance and efficiency that will take your time on the water to a whole new level.FourStroke 150 hp Smarter. Lighter. More durable. Class-leading power that has set the boating world on fire. Engine Displacement: 3000.0 Cubic Centimeter