Mercury - Vented Splash Cover for 2.1L 90hp FourStroke Engines Engine Protection Cover Black Polysoft II Material 8M0228507. Overview. Anyone who spends their weekends on the water knows how much trust we place in our engines. You rely on that 90hp FourStroke to get you across the bay at sunrise, back to the dock before a storm rolls in, and everywhere in between. A good splash cover gives you one less thing to worry about - the kind of quiet reassurance that your engine's finish will still look