Mercury-Quicksilver 8M6001251 Ignition Rotor Delco Conventional Ignition System Marine-Grade Electrical Component 8M6001251. Overview. Anyone who's spent real time running a classic inboard knows how much your engine depends on a clean, consistent spark. It's not something you think about when everything's working right - the engine lights, settles into a steady rhythm, and you're off enjoying the day. But when ignition parts start to weaken, you feel it immediately. The Quicksilver 8M6001251 Ro