Ignition Coil 502881 0502881

Function and Technical Context

The ignition coil is the component responsible for converting battery voltage into the high voltage necessary to generate spark at the spark plugs, being the heart of the ignition system in two and four-stroke outboard engines. In Johnson and Evinrude engines of the 40 HP series, this coil works directly with the ignition module and the stator-flywheel assembly, ensuring precise and constant spark in each combustion cycle. A failure in the coil causes loss of power, difficult starting or complete inability to ignite, potentially leaving the vessel without propulsion during navigation. Reference 0502881 / 502881 is additionally compatible with Mercury/Mariner/MerCruiser applications under reference 802361, making it a part with broad coverage for mixed fleets.

When to Replace This Part?

The most common symptoms of a deteriorated ignition coil are intermittent spark failures, jerking or sudden cuts at full load, difficulty starting in cold conditions and in advanced cases sudden engine shutdown with no possibility of restart. It is recommended to check the condition of the coil in each seasonal maintenance or at any sign of irregular ignition, especially in engines with more than three seasons of intensive use or exposed to high humidity. Replacing the coil preventively at the first signs of failure prevents major damage to the CDI or ignition module, and guarantees safety onboard at all times.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer References