1965 Big Twin Loose Mag Plate

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  • May 30, 2016 at 1:07 am #4387
    aziegner
    Participant

      HI,
      This is Adam from Newfane, VT
      zigfamily23@yahoo.com
      After completing point & cond, plug wires, I put the flywheel on and started. I rev’d it too hi hearing a rattle under the flywheel. Took it off and found play in the mag plate. I likely didn’t tighten the wheel down or rev’d it to high … Meantime are there any fixes to stabilize the plate to eliminate the lateral movement? Is there a berring or bushing to replace. I have read something about putting a dimple somewhere but not sure how to do that ….

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      May 30, 2016 at 3:40 pm #37368
      SCOTT BOGUE
      Participant

        US Member

        As far as I know, that clearance is not adjustable. I had a similar situation with my 1954 Sea King 12 and simply replaced the mag plate with a new one.

        Be sure that the coil laminations are perfectly flush to the machined surfaces they sit on.

        Flywheel torque must be exactly right.

        May 30, 2016 at 3:55 pm #37371
        Leon
        Participant

          The center piece of the powerhead where the mag plate rides on, could get excessively worn and creat that issue. If you remove the mag plate hold down hardware and place the mag plate back on there, you will see better how much slop is there. Replacing the mag plate will help, however the excessive wear will still be there on the other surface.

          May 30, 2016 at 3:58 pm #37372
          frankr
          Participant

            There is a kit to fix that. It updates the mounting parts to those that came out in later years. I’d have to look it up to get the details.

            May 30, 2016 at 4:04 pm #37374
            frankr
            Participant

              580871 Long Life Armature Plate kit. I just happen to have a NOS one. Send me a PM if interested.

              May 31, 2016 at 12:00 am #37398
              jerry-ahrens
              Participant

                US MEMBER PAY BY CHECK

                Frank, what engines will this kit work on? Any Big Twin 35s from the 50’s? Just curious, I have one of those NOS kits too.

                May 31, 2016 at 12:23 am #37401
                frankr
                Participant
                  quote Jerry Ahrens:

                  Frank, what engines will this kit work on? Any Big Twin 35s from the 50’s? Just curious, I have one of those NOS kits too.

                  Officially, 28hp ’62-’64, 33hp ’65-69, 40hp ’61-69. But I know I’ve used them on other motors too, by possibly drilling & tapping a screw hole or something.

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