YAMAHA COIL 66M-85520-00 PAF15-07000300

Function and technical context

The ignition coil is the component responsible for generating the spark necessary for the ignition of the air-fuel mixture in the engine cylinders. It works integrated into the ignition system, transforming the low voltage current from the alternator into high voltage voltage that jumps between the electrodes of the spark plugs. Its correct operation is essential to guarantee reliable starting of the engine and optimal performance during navigation, since any failure in spark generation causes misfires, difficulty in starting or total loss of propulsion power.

When to replace this part?

Typical symptoms of coil failure include recurrent difficulty starting the engine, misfiring under load, rough running, or loss of power during acceleration. Although there is no fixed maintenance interval established by the manufacturer, it is advisable to inspect and verify the condition of the coil at each navigation season inspection, especially if abnormal ignition behavior is detected. Replacing this part preventively when degradation is suspected prevents unexpected breakdowns at sea and ensures safe start-up under all operating circumstances.

Equivalent manufacturer part numbers