Description Mercury 90HP 4-Stroke Forget everything you know about four-stroke outboards. Ours change the game. Completely. They’re 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 75 - 115 hp Embrace possibility. Adaptable, reliable, and able to outperform any outboard in its class.