1962 Lightwin quit running.

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  • July 5, 2015 at 1:10 pm #1941
    The Boat House
    Participant

      Son in law is out with his 1962 Lightwin.
      Running fine then slows down and stops like it ran
      out of gas. Totally dead won’t even pop. Checked
      spark and fuel system, even tried squirting fuel
      into the cylinders. Nothing. I took it out earlier
      in the day and it ran well both at full speed and at
      idle. Relating this to my earlier motors and open
      poppet valve would do the same so are the reads
      the place to start. If that isn’t the issue could it
      be some kind of seal failure? I have seen that
      discussed previously but am clueless as how that
      is accomplished in this motor or if what he has
      described indicated a seal failure has occurred.
      With so many who are knowledgeable in this area
      here, rather than just start pulling stuff off, seem
      to make more sense to ask those who would know
      what I should look for.
      Thanks in advance,
      Tubs

      July 5, 2015 at 1:13 pm #19501
      mike-stroz
      Participant

        Just a thought, but are you sure the magneto is not to blame? You didn’t mention you checked for spark.

        July 5, 2015 at 1:40 pm #19502
        bob
        Participant

          IF YOU SQUIRTED A FUEL MIX INTO THE CYLINDERS AND DIDN’T GET A POP THEN IT IS SOMETHING IN THE IGNITION OR QUITE POSSIBLY A BLOWN HEAD GASKET CREATING LITTLE TO NO COMPRESSION TO FIRE THE MOTOR UP.

          July 5, 2015 at 1:42 pm #19503
          chris-p
          Participant

            I would start with a compression gauge.

            I see you said the spark is fine, will it jump a 1/4" gap ok?

            July 5, 2015 at 4:32 pm #19512
            fleetwin
            Participant

              US Member - 2 Years

              yeah, start with the basics, kinda doubt the reeds are to blame. Didn’t overheat did it? Don’t forget to check fuel quality/water as well. No oil in gas??

              July 5, 2015 at 9:00 pm #19530
              The Boat House
              Participant

                • This reply was modified 5 years, 10 months ago by The Boat House.
                • This reply was modified 3 years, 7 months ago by The Boat House.
                July 5, 2015 at 11:34 pm #19544
                seakaye12
                Participant

                  US Member

                  Defies logic; doesn’t it?

                  Say….do you suppose that in the course of all the testing and re-testing….maybe your son in law or a helpful volunteer managed to get the spark plug leads reversed?

                  July 6, 2015 at 12:29 am #19546
                  The Boat House
                  Participant

                    • This reply was modified 5 years, 10 months ago by The Boat House.
                    • This reply was modified 3 years, 7 months ago by The Boat House.
                    July 6, 2015 at 12:31 am #19547
                    tom-c
                    Participant

                      Sounds like head gasket to me. They tend to blow a hole between the cylinders. So losing compression from one cylinder to the other.

                      July 6, 2015 at 9:48 am #19566
                      billw
                      Participant

                        US Member

                        I know you’re meticulous an no doubt used a torque wrench; so please pardon this question….sheared flywheel key?

                        Long live American manufacturing!

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