YAMAHA IGNITION COIL 66T-85570-00 REC66T-85570-00

Function and technical context

The ignition coil is the essential component of the ignition system that generates the high voltage necessary to produce the spark at the spark plugs. On Yamaha outboard engines, this coil works in coordination with the electronic control module to ensure precise ignition in each cylinder. Its correct operation is critical to maintain efficient combustion, ensure reliable engine starting and avoid significant power losses or irregular operation during navigation.

When to replace this part?

Symptoms of a faulty ignition coil include difficulty starting the engine, unstable revs, misfiring under load, and noticeable loss of acceleration. Although there is no fixed replacement interval, it is recommended that the condition of the coil be inspected during each seasonal inspection, especially after several years of use or if the motor has been exposed to extremely humid conditions. Preventatively replacing the coil when initial symptoms are detected prevents running out of propulsion in the water and reduces the risk of secondary damage to the ignition system.

Engine Compatibility

Equivalent manufacturer part numbers