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How to diagnose the CDI

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    #16
    Actually it's all a moot point. I redid my gauges, including the wiring for power I accidentally used the black/yellow wire and it was grounding out the 2&3 coil circuit. Unplugged that and it's working fine now, sorry for all the trouble. I'll use the grey wire now, which I believe is for parking lights.

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      #17
      Originally posted by Curly View Post
      Actually it's all a moot point. I redid my gauges, including the wiring for power I accidentally used the black/yellow wire and it was grounding out the 2&3 coil circuit. Unplugged that and it's working fine now, sorry for all the trouble. I'll use the grey wire now, which I believe is for parking lights.

      These things happen, but the main thing is you got it sorted and did not have to buy something you did not need! Glad you are sorted.

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        #18
        Originally posted by Matchless View Post
        These things happen, but the main thing is you got it sorted and did not have to buy something you did not need! Glad you are sorted.
        Well, I learned alot following this saga. Thanks, Mr. Matchless! I had been wondering if the pole piece passing the signal coil interrupted a small current flowing from ignitor or if it instead caused a pulse in the coil .
        1981 gs650L

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

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          #19
          It technically only sends a pulse to the ignitor. The spark pulse is entirely in the coil, with only 12v triggers being sent from the signal generator and then a timed trigger going to the coil. Remember it changes with rpm.

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            #20
            As Curly said, a small pulse is generated by the pickup which then goes to the igniter where it is amplified and from there a stronger pulse is sent to the coil to generate the spark. Earlier bikes had a mechanical advance which would advance the timing at the pickups. Later bikes have the advance built into the igniter where it is advanced electronically.

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              #21
              I'm using a MegaSquirt on my other toy, a turbo charged Miata. I'd be interested to see if you could get our bikes running on one, or at least the MicroSquirt. Problem is you'd only be using it for spark, as fuel, fans, boost control, etc, etc aren't used on our carburetor ran bikes.

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