Lauson T653

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  • September 6, 2015 at 5:34 pm #2471
    wedgie
    Participant

      Finally got to looking at the Lauson T653. Cleaned the carb and set and cleaned the points. The Eiesmann 62d mag coil has leaked most of the tar out of it.
      I have spark, but it’s not alternating (10 second mark in video). That’s not right, is it ?

      http://vid635.photobucket.com/albums/uu … xltf1e.mp4

      September 6, 2015 at 6:06 pm #23355
      brian
      Participant

        Actually it is correct as it fires every turn of the flywheel which means it also fires on each cylinder exhaust stroke. A simple solution for that setup.

        September 6, 2015 at 6:12 pm #23356
        frankr
        Participant

          US Member - 1 Year (includes $3 online payment fee)

          Speaking of same time, Brian and I posted at the same time, but mine didn’t take. But he said it in a whole lot fewer words than I did.

          September 6, 2015 at 6:16 pm #23357
          wedgie
          Participant

            Ah, I get it 💡 . Thanks !

            September 6, 2015 at 7:11 pm #23360
            wedgie
            Participant

              Anyone know the initial carb settings, or where to find diagrams/instructions for the T653 ? Carb is Tillotson ya8a

              September 7, 2015 at 5:41 pm #23417
              wedgie
              Participant

                Well, I got it to fire for a millisecond and promptly sheared the flywheel key. I had noted that the key was showing signs of fatigue, and despite what I thought was adequate torquing, it let go on me.
                picture upload

                I see there is one on Ebay that looks similarly worn. Also it is from the S300 motor, so I am uncertain if it is the correct dimensions.

                What type of stock can I use to fabricate a replacement ?

                September 7, 2015 at 7:03 pm #23423
                frankr
                Participant

                  US Member - 1 Year (includes $3 online payment fee)

                  Nothing fancy. Just steel key stock.
                  http://www.mcmaster.com/#key-stock/=yu643v

                  September 7, 2015 at 7:22 pm #23427
                  wedgie
                  Participant

                    Thanks again Frank.

                    Too bad Mcmaster doesn’t deal with Canada. I will check around locally.

                    September 7, 2015 at 7:48 pm #23430
                    brian
                    Participant

                      After you replace the flywheel key I believe there is a magneto adjustment to set the timing but it’s been years since I worked on one. I will check and see if I have a T600 manual which is the same basic engine design.

                      September 7, 2015 at 8:14 pm #23432
                      brian
                      Participant

                        Ignition timing

                        Set points to .020"

                        Remove cylinder head
                        Turn crankshaft clockwise until breaker arm just starts to open
                        At this point top of piston should be 5/32" from top face of cylinder
                        If out of time, loosen the 2 cap screws holding magneto stator to the bearing plate
                        And move the stator to the right or left until the points just start to open
                        with the piston 5/32" from the top face of cylinder.
                        Fasten screws securely.

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