Yamaha - Ignition coil assembly - 6R3-85570-01-00A reliable ignition system is the backbone of a strong running outboard, and the Yamaha Ignition Coil Assembly (6R3 85570 01 00) ensures every start is smooth and every throttle response is crisp. Designed to generate and deliver the high voltage spark necessary for combustion, this coil plays a crucial role in engine performance. Over time, a weak or failing ignition coil can cause misfires, sluggish acceleration, and even difficulty starting.