Mercury - Quicksilver Engine Starter Direct Drive Series 12-Volt 8M6007321. Overview. There's a special kind of reassurance that comes from an engine that fires the moment you ask it to. No hesitation-just a clean, confident crank that sends you toward open water. The Quicksilver 8M6007321 is built to deliver that dependable start-up performance for select outboard applications, helping you get on plane quickly and return to the dock with confidence.. Key Features. Permanent magnet direct-drive