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'82 GS850G CDI compatability

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    '82 GS850G CDI compatability

    Does anyone know if slightly later CDI (e.g. from '83-85 GS500E) could be made to work well on my '82 GS850G? Part numbers are different but wire colours are same on diagrams and neither have mechanical advance. No need to respond "buy a Dyna"! Thanks in advance

    #2
    First of all, you do NOT have a "CDI". No GS ever left the factory with a CDI-type ignition.

    What you DO have is just a basic ELECTRONIC ignition. The older-style mechanical points are replaced by a box of transistors that do the switching with no moving parts.


    Now to answer your question: NO.

    Starting in '83, the mechanical advance mechanism was removed from the end of the crank and was moved into the IGNITOR (box of transistors). It is not a simple matter of swapping the ignitors, the pickup coils on the end of the crank and the wiring between them is also different. Different plugs. Different number of plugs. Different number of wires.
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      #3
      A good option is to install a mechanical advance unit from an earlier 850 or 1000 and then install a Dyna S.
      Ed

      To measure is to know.

      Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

      Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

      Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

      KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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        #4
        Pardon me for referring to the ignitor as a CDI, as I have heard others do. Mine is an '82 and I don't see a mechanical advance down there behind the pick up coils. I was not asking if I could swap ignitors across different advance systems. First I will try to find a suitable ignitor. Thanks Nessism for your suggestion.

        Comment


          #5
          An 1100G ignitor may work.
          Ed

          To measure is to know.

          Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

          Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

          Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

          KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

          Comment


            #6
            Originally posted by ednearls View Post
            Does anyone know if slightly later CDI (e.g. from '83-85 GS500E) could be made to work well on my '82 GS850G? Part numbers are different but wire colours are same on diagrams and neither have mechanical advance. No need to respond "buy a Dyna"! Thanks in advance
            Hi, I would not use a igniter that was not designed for your machine (gs550 ect.) There is a chance that the
            advance curve will be different. New OEM igniters are very expensive as are dyna 2000. The ignitech unit is about the same price as what some people are asking for a used unit. So you have several options.
            1983 gs1100ed restro-mod. 1998 gsxr 1100 almost mint, 2019 kawasaki klx250, 2011 Beta 250 evo trials bike, 2017 Montesa 300rr trials bike, 2021 honda crf250rx woods weapon

            Comment


              #7
              Originally posted by chris View Post
              Hi, I would not use a igniter that was not designed for your machine (gs550 ect.) There is a chance that the
              advance curve will be different. New OEM igniters are very expensive as are dyna 2000. The ignitech unit is about the same price as what some people are asking for a used unit. So you have several options.
              PN 32900-49420 ignitor is used on the 16V 700, 850, and 8V 1100.
              Ed

              To measure is to know.

              Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

              Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

              Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

              KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

              Comment


                #8
                That's good info Ed. I bet a new one is more than double the price of a ignitech. The igniter on my 83 is about $500, 700 alpha and does not do the advance, it still has the mechanical advance. I did not know there was a 16v 850.
                1983 gs1100ed restro-mod. 1998 gsxr 1100 almost mint, 2019 kawasaki klx250, 2011 Beta 250 evo trials bike, 2017 Montesa 300rr trials bike, 2021 honda crf250rx woods weapon

                Comment


                  #9
                  Originally posted by chris View Post
                  That's good info Ed. I bet a new one is more than double the price of a ignitech. The igniter on my 83 is about $500, 700 alpha and does not do the advance, it still has the mechanical advance. I did not know there was a 16v 850.
                  Whoa, there was a 16v 850?
                  Ryan

                  1979 GS850G - currently undergoing a major overhaul
                  1986 GSX-R750 - I'm figuring it out

                  Comment


                    #10
                    Originally posted by RustyTank View Post
                    Whoa, there was a 16v 850?
                    All 850's were 8V.
                    Ed

                    To measure is to know.

                    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                    Comment


                      #11
                      Originally posted by ednearls View Post
                      Pardon me for referring to the ignitor as a CDI, as I have heard others do. Mine is an '82 and I don't see a mechanical advance down there behind the pick up coils. I was not asking if I could swap ignitors across different advance systems. First I will try to find a suitable ignitor. Thanks Nessism for your suggestion.
                      The point in mentioning the Dyna S is because it's fairly cheap and it can be made to work in your bike. I know you didn't want the Dyna suggestion but it's important to differentiate the S from the much more expensive Dyna 2000 with a programable advance curve which is not needed for your bike.
                      Last edited by Nessism; 03-03-2021, 10:25 AM.
                      Ed

                      To measure is to know.

                      Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                      Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                      Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                      KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                      Comment


                        #12
                        Originally posted by Nessism View Post
                        All 850's were 8V.
                        Got it. I think Chris and I misread your post. I just re-read it and understand what your saying.
                        Ryan

                        1979 GS850G - currently undergoing a major overhaul
                        1986 GSX-R750 - I'm figuring it out

                        Comment


                          #13
                          thank you Nessism that's helpful

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