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How to diagnos a motorcycle cdi

Can you send us a cdi wiring diagram

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A lot of times when you look in the service manuals they tell you to replace with good unit and see if fixes problem. now this seems crazy because cdi units are usually a couple of hundred bucks and you can not return electrical parts. so what i have done in the past is put in ad on craigslist for someone with the same bike to come over and test their cdi on my bike and give them $10.00 -$20.00 for their trouble

Posted on May 12, 2009

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Hi and welcome to FixYa,

To my knowledge most motorcycle CDIs have multiple wires/connections. The pinout could have the following:

  1. 2-4 wires from the pulse trigger. This is normally located beneath the magneto or in some cases a crank sensor;
  2. IGN B+12 coming from the ignition switch;
  3. IGN coil's negative terminal. The coil's positive terminal goes likewise to the IGN B+12;
  4. interlocks:
  • sidestand switch;
  • neutral switch;
  • clutch switch;
  • RUN (Engine OFF) switch.
Good luck and thank you for using FixYa.

Posted on Feb 13, 2009

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