YAMAHA PULSATION COIL 66M-85580-00 PAF15-07000200

Function and technical context

The pulsation coil is the fundamental component of the ignition system of small displacement Yamaha outboard engines. This part generates electrical impulses that synchronize the spark in the spark plug at the exact moment of the compression cycle, guaranteeing efficient combustion of the fuel. It works integrated into the magneto ignition system, where the variation of the magnetic field when the rotor rotates induces the current that the coil amplifies and distributes. Without a functional pulsation coil, the engine cannot maintain stable revolutions, experiences progressive loss of power and, in severe cases, may fail to start or stall repeatedly while cruising.

When to replace this part?

Typical symptoms of pulsation coil failure include intermittent misfires, difficult cold starting, loss of acceleration, or unstable idle. Although there is no fixed maintenance interval for this part under normal conditions, it is recommended that its condition be inspected during each seasonal inspection, especially if the engine has been exposed to excessive moisture or has suffered partial submergence. Preventive replacement of the pulsation coil when the first symptoms are detected prevents unexpected stays in the water and saves major repairs on other ignition components.

Equivalent manufacturer part numbers