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20 HP compression specs

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  • 20 HP compression specs

    I have a 1986 Johnson 20 hp with compression in the top cylinder of 50psi and 30 in the lower cylinder....blown head gasket? worth fixing or pick up another motor...used of course!

  • #2
    Pull the head and see if cylinder or pistons are damaged.
    Regards
    Boats.net
    Johnson Outboard Parts

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