Mercury - Ignition Coil Engine Ignition System Brass & Stainless Steel 8M0044991. Overview. Ask any seasoned boater what gives them the most peace of mind out on open water, and they'll probably tell you the same thing: a strong, predictable ignition. When you turn that key, you want the engine to fire without hesitation-no stumbles, no guessing. That steady confidence is exactly what this Mercury Marine part delivers. It's the kind of component you install once and trust every single time you p