Big twin compression test

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  • August 21, 2015 at 9:33 pm #2320
    wiscoboater
    Participant

      Hi Guys,
      I picked up a 57 35 Johnson today. I seem to remember these having a compression release for the pull starting. This one has no electric start, so how do I disengage the compression release to get a proper reading?

      August 21, 2015 at 9:34 pm #22460
      DAVID
      Participant

        US Member

        YES!!

        August 21, 2015 at 9:38 pm #22462
        wedgie
        Participant

          Remove the actuator arm on top of the starter.

          August 21, 2015 at 10:06 pm #22465
          chris-p
          Participant

            I just unscrew the 2 screws that hold the SS horizontal bar to the compression relief tower.

            August 21, 2015 at 10:44 pm #22469
            wiscoboater
            Participant

              What’s an acceptable number on the compression? It’s an RD 19

              August 22, 2015 at 12:12 am #22476
              chris-p
              Participant

                95 to 125 roughly.

                August 22, 2015 at 12:29 am #22478
                wiscoboater
                Participant

                  Thanks Chris, and everyone else

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