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Thread: Relay for CDI to M Unit.

  1. #1
    Join Date
    May 2021
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    California
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    Default Relay for CDI to M Unit.

    So I have an m unit on my 1980 gs750 and my bike doesn’t have spark. So I read up that there needs to be a relay in between the CDI to the M Unit. I included the revive wiring diagram that shows how to do that, but my CDI only has 2 wires excluding the ones to the stator which is the green and blue wire that goes into the signal generator. In the diagram there’s a 3rd one going from the CDI to the relay. And the description says find the kill button? Can someone explain the diagram as to where that 3rd wire came from and where am I suppose to connect it too. Thanks in advance.

    not able to upload photo for some reason but the diagram is in the link: https://technicalarticles.revivalcyc...with-an-m-Unit
    Last edited by Bulldozaaa; 07-21-2021 at 03:21 AM.

  2. #2
    Join Date
    Jul 2016
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    Detroit, Michigan
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    The info found at that link in incorrect for suzuki gs'es. Further I'd like to clarify, what you call CDI is called an ignitor, and what you call a stator is called a signal generator or pickup coil. The GS'es aren't equipped with Capacitive Discharge Ignitions.
    Last edited by Killer2600; 07-21-2021 at 10:30 AM.

  3. #3
    Join Date
    Aug 2010
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    Sebago,Maine
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    Iíd look at this wiring diagram ....your 750 is real similar. Note the wires leading from signal generator up to ignitor....from there itís off to ignition coils.
    has this thing run for you yet??

    http://members.dslextreme.com/users/..._color-new.png
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

  4. #4
    Join Date
    May 2015
    Location
    Central NY State
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    Quote Originally Posted by Bulldozaaa View Post
    but my CDI only has 2 wires excluding the ones to the stator which is the green and blue wire that goes into the signal generator.
    Be patient with me here, but the unit you refer to as a CDI, is probably your “ignitor”, and has a green wire and a blue wire that go to the signal generator. But there shouldn’t be any wires going from your ignitor to the stator. Wires from the stator go to the regulator/rectifier. Don’t think you have the R/R and ignitor mixed up?

    Where is what you call your “CDI” located?
    1980 GS750E (bought used June,1983)
    1968 CB350 Super Sport (bought new Oct,1968)
    1962 CA77 305 Dream (bought used Feb,1963)

  5. #5
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    May 2021
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    California
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    Sorry, this is my first bike 😩. Trying to do my own research but people are calling it that I figured they were right. But thanks for the lesson.

  6. #6
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    May 2021
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    Oh yeah sorry I didnít mean from the igniter to the stator, itís connected to the coils.

  7. #7
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    May 2021
    Location
    California
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    So igniter is connected to the pick up(blue, green). And then the other wires to the coils. I didnít have a OEM wiring harness when I got the bike, it was a ball of wires missing a bunch of them so I basically had to re-wire everything and bought the m unit.

  8. #8
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    May 2015
    Location
    Central NY State
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    Oh,okay.

    The yellow wire at the ignitor comes from the kill switch.
    When the ignition switch is on and the kill switch is in the run position the yellow wire coming from the kill switch provides power to the ignitor by way of that yellow wire, and also provides power to both coils.

    One of the black wires at the ignitor provides a ground for the ignitor.

    The other black wire at the ignitor provides a ground to one coil to cause that coil to fire when the ignitor pulls it to ground.

    The white wire at the ignitor provides a ground to the other coil to cause it to fire when the ignitor pulls it to ground.

    So how do you have the “M” unit wired in to the ignition circuit?
    Last edited by pdqford; 07-21-2021 at 10:05 PM.
    1980 GS750E (bought used June,1983)
    1968 CB350 Super Sport (bought new Oct,1968)
    1962 CA77 305 Dream (bought used Feb,1963)

  9. #9
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    May 2021
    Location
    California
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    I have the ignitor and the coils wired the way you said. But I donít have the kill switch because Iím using a momentary button for the on and the off, which is why I thought I needed a relay unless I get a separate button just for the kill switch. Could it be a weak ground? Bad ground on ignitor or bad ground on the coils? The black wire from the coil is connected to the B/Y of the ignitor.

  10. #10
    Join Date
    May 2015
    Location
    Central NY State
    Posts
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    Are you using the start button to start the engine?
    And double pushing the start button to shut the engine down?
    1980 GS750E (bought used June,1983)
    1968 CB350 Super Sport (bought new Oct,1968)
    1962 CA77 305 Dream (bought used Feb,1963)

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