1967 3 hp Johnson compared to a 1955 3 hp

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  • June 28, 2026 at 12:32 pm #323169
    jimk
    Participant

      I just picked up a nice little folding Johnson 3 and it came with the owners manual. According to that it is ok to run at a 50:1 mix. Question is if there are any differences in that motor compared to my 1955 3 hp that calls for a 16:1 mix? I have it running at a 24:1 now and will probably stick with that. It came with a case in good condition but I would think most do being I don’t see a need for the case. I have it on a stand and will keep it on it but it is kind of a unique little motor.

      June 28, 2026 at 1:00 pm #323171
      seakaye12
      Participant

        US MEMBER PAY BY CHECK

        That’s a good question!  If it were my motor I wouldn’t run it on anything leaner than 16:1 regardless of what the manual says.

        The manufacturers were under a lot of pressure to get the oil ratios more “environmentally accommodating” .  The 1967 motor is still a bushings only motor.

        Like in the 80’s when they started saying 100:1.  They reneged on that pretty quickly but not before having to warrranty a lot of powerheads damaged by lack of oil.

        Lets see what some of the OMC Pros have to say.

        June 28, 2026 at 1:37 pm #323173
        JACQUES
        Participant

          jsut follow what he manuf  saysalthough in theearly days  SAE30 was the usual oil to use.  today with TWC3  i use 1L/25L  on all oldies

          no problems so far.

          to service oldies download the bible…. good for J&E

          https://www.socalaomci.com/library/johnson_service_manual_10th_edition.pdf

           

           

           

          Joining AOMCI has priviledges 🙂

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