Mercury - Starter Motor 100-125 HP & Jet 80 Four-Cylinder Marine-Grade Steel 893892T. Overview. When you run a powerful four-cylinder Mercury outboard, that first start of the day sets the tone. There's a certain confidence that comes from turning the key and hearing the engine surge awake-no dragging, no uncertainty, just clean energy ready to push the boat wherever you want to go. Whether you're cruising upriver at dawn or trimming down for a fast run across open water, this Mercury Marine par