Reply To: Johnson 1949 HD 25 No Spark

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December 28, 2025 at 8:25 pm #302720
Sam M.
Participant

    Canada Member

    Are the flywheel magnets still strong?

    You could also try checking the gap on each spark plug.

    Are you pulling it over with a rope or turning the flywheel by hand because it might not spark if being spun over too slow, which could be the case if you aren’t using a rope.

    I wouldn’t worry about the compression for now.  Just don’t feed the motor any less oil than 16/1.