Mercury - Starter Motor 30-50 HP Two-Stroke & Jet Series Marine-Grade Steel P893890T. Overview. A good starter motor gives your day on the water a strong beginning. When you turn the key and hear that clean, confident crank, everything else falls into place-the fishing rods feel lighter, the breeze feels better, and the shoreline slowly slips behind you. This Mercury Marine part brings that reliable start to engines that work hard in real-world conditions. Whether it's a nimble thirty horsepower