Reply To: Restoration of 1964 3hp Johnson JH 19A

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April 27, 2022 at 9:36 am #259055
Don
Participant

    US Member

    Well, I wouldn’t mess with it.  These are low compression engines, so your 65PSI reading is not surprising.  Keep in mind that compression readings are oftentimes a little low due to limitations of the compression gage to compensate for such small combustion chambers.

    I would remove the head and exhaust cover, and inspect pistons and cylinders as best you can.  If all looks OK, I would clean everything up and “rough up” the cylinder walls with some light emery/crocus cloth, check head/block/exhaust cover for flatness and reassemble with sealer.