Reply To: 1956 Johnson 3HP compression

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May 23, 2025 at 5:10 pm #296697
Tacitus043

    Thanks for the info guys.  Looks like I’ll have to pop off the flywheel and investigate the mag assembly.  Compression aside, the spark should be way stronger.  Hopefully my compression gauge is just reading low.  I’ve always used it to find relative differences between cylinders on bigger engines with higher compression and have not really paid attention to the overall number.

    I figure once I get the spark straight I’ll re-test, and hopefully she will fully light off.  If not I guess it’s back to the drawing board with the power head!