Mercury - Starter Motor Assembly Two-Stroke 65-90 HP Series Marine-Grade Steel 893891T. Overview. There's a familiar comfort in hearing a two-stroke Mercury snap to life the moment you turn the key. It's a sound many boaters grew up with-raw, dependable, and ready for whatever the day brings. When your engine fires up cleanly, everything else seems to fall into place. You settle into the seat, feel the hull lift, and trust that the boat will do exactly what you ask of it. This Mercury Marine par