YAMAHA CHARGING COIL 66T-85520-00

Function and technical context

The Yamaha 66T-85520-00 charging coil is the fundamental component of the ignition system that generates the electrical energy necessary to power the outboard motor. Mounted directly on the crankshaft, this coil transforms the mechanical rotation of the engine into electrical current that supplies power to the spark plugs, ensuring correct ignition of the fuel in each cylinder. Proper operation is essential to maintain efficient combustion, prevent power loss and ensure smooth engine starts under all operating conditions, from warm water to seawater cooling.

When to replace this part?

Typical symptoms of a faulty charging coil include difficulty starting the engine, progressive loss of power, irregular revs at idle and misfires while cruising. Although there is no established preventive maintenance interval, the coil can deteriorate due to prolonged exposure to marine humidity, intense vibrations or abnormal electrical charges; It is recommended to inspect its condition during each seasonal inspection and replace it preventively if any anomaly is detected in electrical operation. Changing it preventively when doubts arise avoids being stranded in the water and ensures safe navigation without unexpected interruptions.

Engine Compatibility Table

Equivalent manufacturer part numbers