'86 GS550 Ignition & Timing Questions

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  • ryguy425425
    • Jan 2026
    #1

    '86 GS550 Ignition & Timing Questions

    I picked up a basket case GS550EF, and I am looking to build my own CDI Igniter using the original pickup coils. Reading the manual I have figured out how to process the signal and what the output to the coils needs to be, but I can't seem to find a few pieces of information.

    I know the ignitor controls the timing advance, but I can't seem to find the initial advance, max advance, and at what RPM max advance is achieved.

    I also can't find what the output voltage of the pickup coils should be (The trigger voltage, not average). This I could determine myself though. The service manual I have indicates that a negative pulse is sent to trigger at the correct minimum advance, and a positive pulse is sent at maximum advance. As long as this is correct and there isn't a couple of degrees delay in between the trigger pulse and the spark firing then construction should be fairly simple.

    My plan is to build a unit based around a cheap micro controller. The total cost would be around $20, use the original ignition system (minus ignitor), and be fully programmable for added advance. This could be a very nice DIY replacement for a part that is getting harder and harder to find.
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    • trippivot
      Forum Sage
      Past Site Supporter
      • Aug 2006
      • 2815
      • Des Moines , IA
      #2
      the basics just off the top of my head - may be a little off but will work excellently

      11~13 original degrees

      jump it to 32~36 at 1800~2000 rpms

      pick up coils have 100 ~ 800 ohms and will send approx 0.3 ACV signal ..

      you can get a swing needle meter and swipe a screwdriver by the pick up to test my accuracy.

      GPZ 750 igniters have the advance inside .. GS1150 do too.-- pulsers are common and brains swap easy
      SUZUKI , There is no substitute

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        • ryguy425425
          #3
          Originally posted by trippivot
          the basics just off the top of my head - may be a little off but will work excellently

          11~13 original degrees

          jump it to 32~36 at 1800~2000 rpms

          pick up coils have 100 ~ 800 ohms and will send approx 0.3 ACV signal ..

          you can get a swing needle meter and swipe a screwdriver by the pick up to test my accuracy.

          GPZ 750 igniters have the advance inside .. GS1150 do too.-- pulsers are common and brains swap easy
          Awesome! That's exactly what I was looking for! I'm waiting on a few parts to come in the mail, then I'll post what I come up with.

            Comment

            • ryguy425425
              #4
              Originally posted by trippivot

              GPZ 750 igniters have the advance inside .. GS1150 do too.-- pulsers are common and brains swap easy
              So if I have to scrap the project and buy a new igniter, a Kawi 750 or '80+ GS1150 unit would be a direct fit? (After I splice in the wiring I'm assuming) The previous owner cracked into my ignitor, so at this point it has to go. If I can find a used one cheap that'll get the bike running while I'm construction my custom ignitor.

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                • JEEPRUSTY
                  #5
                  hmm the precise timing is in the manual
                  look it up on basscliff's website

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