Mercury - Quicksilver 8M6001252 Ignition Rotor Delco HEI System Marine-Grade Electrical Component 8M6001252. Overview. There's something reassuring about turning the key on a well-kept MerCruiser V8 and hearing it fire instantly - no hesitation, no coughing, just smooth, confident ignition. That dependable start is what keeps your day on the water easy and enjoyable, and it depends on every part of the system doing its job. The Quicksilver 8M6001252 Rotor is built for that kind of reliability, e