Reply To: 1974 Evinruded 9.9 HP question

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If fresh plugs don’t fix the problem, I’d go thru the electrical system end to end. Starting with the plug wires, remove the boots and refasten the spring terminals after snipping a 1/4″ off the wires to ensure continuity. Same at the coil end. Make sure the wires core is in contact with the pin in the coil. Your coils might have the factory sealed wires on them and an ohm reading should be taken of both the primary and secondary circuits in the coils. Are the coils cracked or showing signs of aging? A bad coil can work fine when it is cold but will start acting up as it warms up.

These motors use the Lo-Tension magneto and both sets of points must be clean and gapped equally for the system to work properly. What about the condensers, P/N 581419? They go bad with age and should be replaced and they are another item which will start acting up as they get hot. If everything checks out and all of the connections are clean and tight, the driver coil under the flywheel could be going bad. And of course, it to is affected by heat.