Reply To: 1960 Johnson 3 HP JW-16

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March 20, 2021 at 10:08 pm #234451
David Stanton
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    If your compression gauge has its check-valve at the gauge end of the hose, you will read low compression on these small cylinders due to the added volume of the hose to compress into, but I would still expect more than 18 pounds. The only one I’ve seen compression that low on had a blown head gasket between the two cylinders, but you have a new gasket and lapped the head so I doubt that’s your problem.
    Dave