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  • Yellow cdi bypass wire

    what exactly does it do and mean if when unplugged I have no issue starting my motor? With it plugged in it has no spark. 1991 225 carbed txrp

  • #2
    I do not really know, but I think it bypasses some of the controls to spark incase something fails so you can get back to land

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    • #3
      Originally posted by 99yam40 View Post
      I do not really know, but I think it bypasses some of the controls to spark incase something fails so you can get back to land
      I think it will give me a better clue to my issue. Maybe I'll call yamaha tomorrow. They have be pretty.helpful in the past.

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      • #4
        someone will have to test everything to see what is missing
        voltages into and out of the CDI should help point in a direction

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        • #5
          Is the safety lanyard wire yellow? Just to be clear, there is no CDI "bypass"

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          • #6
            Connecting the yellow wire puts the motor into the fixed ignition timing mode. Used in the event there is a CDI malfunction that prevents the motor from starting, the RPM from being stable, or the motor fails to reach an operating RPM.

            zcd.png

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            • #7
              I thought I read that some where in the past for some motors

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              • #8
                Yeah. I understand that part. Im just curious,if I had a bad stator or pulsar I'd assume the yellow wire would have no effect in anything?

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                • #9
                  Have you tested the coils and other components for proper output voltage?

                  The yellow wire needing to be disconnected indicates there is a problem. Which was probably already known. The problem that is. It is up to someone to trouble shoot the system to find the source of the problem.

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                  • #10
                    I'm trying to trouble shoot it. I have limited info. I've been an automotive mechanic for the past 25 years. I am capable of figuring things out given the proper resources. Also, im not familiar with 2 strokes so I'm learning as I go.

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                    • #11
                      I too was a auto tech way back in the day, before I turned into a industrial electrician and then and I & E tech
                      so you will have the proper info to read in a Yamaha service manual for your motor,
                      or look on the web for CDI Electronics Troubleshooting on Yamaha for the specs

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                      • #12
                        I have the yamaha manual. It's lacking info. I just googled the cdi info and will check voltage tomorrow. only problem is my engine isn't listed except for the appendix

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                        • #13
                          LIT-18616-00-61???

                          Send me your email via PM and I will send you data indicating the voltages. The attachments here are no longer working well for me.

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                          • #14
                            Originally posted by boscoe99 View Post
                            LIT-18616-00-61???

                            Send me your email via PM and I will send you data indicating the voltages. The attachments here are no longer working well for me.
                            Thats the one. Ill pm you my email. Thanks

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