No Spark on #2 & #3 1980 GS750LT

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  • 80gs750LT
    #1

    No Spark on #2 & #3 1980 GS750LT

    I was riding my 1980 GS750LT last fall, when it sputtered a few times, then died. It would not restart, or even fire. I had to trailer it home. I finally got around to working on it a month or so ago, and found that I had spark on #1 & #4, but not on #2 & #3. I thought the coil was bad, so I took it to The Rice Paddy in Columbus, Ohio to get a used one. They tested mine, and said it was good. Later, I tried another, with no spark. I made jumpers to connect the 1&4 wiring to the 2&3 coil, and got spark. I have checked the continuity of both wires going to the 2&3 coil, and both were OK.

    I checked the resistance of the signal generator, and it is in spec.

    I did the ignitor test using a 1.5V battery, and got no spark from either plug wire (3&4).

    It seems like the ignitor is bad, but I'm hesitant to buy one without knowing for sure. Anybody have any thoughts? Thanks.
    Tags: None
    • rapidray
      Forum Guru
      GSResource Superstar
      • Oct 2006
      • 8195
      • So Cal
      #2
      You need to replace the signal generator as the 2/3 pickup has gone bad. I would recommend you just replace it with a Dyna S plate & be done with it! Ray.

        Comment

        • earlfor
          Forum LongTimer
          Charter Member
          GSResource Superstar
          Past Site Supporter
          • May 2002
          • 42413
          • off grid cabin 1/24/26 7pm
          #3
          Just buy a Dyna S ignition for it. The Dyna replaces the stock crankshaft triggers and the stock ignitor module at about 1/3 the price of stock parts.
          (the stock crank triggers and ignitor go directly to trashcan :-) )

          Earl
          Komorebi-The light filtering through the trees.

          I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

            Comment

            • Guest
              #4
              If you conclude that you need an igniter I have one that will work on your bike.

                Comment

                • 80gs750LT
                  #5
                  I'd like to fix the bike spending as little money as possible, as I'll probably try to sell it soon. I may try to find a replacement signal generator first, as it is less expensive.

                  If I go with the Dyna ignition, is this what I need?

                  http://tinyurl.com/637ljc

                  Thanks for all the replies!

                    Comment

                    • 80gs750LT
                      #6
                      I got the bike running, and despite having sat for about 8 months, it' s actually running pretty well (after I remembered to put the air box back on!).

                      Bill (chef1366) sold me a used ignitor and signal generator at a very good price, and shipped it very quickly. I installed the ignitor first, as it is the easiest, and it fixed the problem.

                      But, as my luck goes, now that it's running, the starter button quit working yesterday! I haven't had time to look at that yet.

                      Thanks again for all the help.

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