Reply To: 1960 Johnson 3 HP JW-16 compression issue

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June 29, 2021 at 2:03 pm #241557
Buccaneer
Participant

    US Member

    Is that a “psi” reading, or metric of some kind? If psi, I’d think you’d
    get even a higher reading with no rings on the pistons.
    If it’s a psi reading, time for a new compression gauge.

    Do you have any “rebound” when you spin the flywheel by hand?
    Were the cylinders “lightly” honed?

    Prepare to be boarded!