CDI questions

Discussion in 'Tech Area' started by Deoodles, Aug 23, 2020.

  1. allenp42

    allenp42 Well-Known Member

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    That file I posted may not show up correctly. If you or anyone else does not see 3 switches and part numbers, please reply and I'll re-convert the file to a PDF.
     
  2. Deoodles

    Deoodles Well-Known Member

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    Oh, I only see 1 switch. 3 position
     
  3. allenp42

    allenp42 Well-Known Member

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    I made a change. Try again.
     
  4. Deoodles

    Deoodles Well-Known Member

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    Success thanks for the information. It is helpful
     
  5. Deoodles

    Deoodles Well-Known Member

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    OUCH! I installed the harness. I blew the fuse twice and think I may have blown my tach. All that and I didn’t start it yet. The issue is in the wiring to the handlebar cut off switch and the tach. They both use the coil B/W wire. I’ll figure that out. All the lights,indicators,signals,digital speedometer, etc. work fine. This is going into another day. The tach thing annoys me. I have spares. They were cheap.
     
  6. Deoodles

    Deoodles Well-Known Member

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    Day 2. I found the short. It was a 12v feed in the right handlebar switch for the starter. I removed it. The tach may be okay. I would like someone to confirm what wire I get the signal from. I think I got that wrong. I think I wanted B/R at the CDI and took B/W instead. It’s going to be a real pain to fix that but I might as well do it while the gas tank is out I also put a new coil in and started the bike. I verified I’m charging and the set point is 12.8v. I think tomorrow I should be able to button it all up just need to know if my tachometer is bad or I got the wrong signal?

    1FD590D9-F4FE-4504-B8AE-60731432A247.jpeg
     
  7. racerx

    racerx Administrator
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    I've never heard of a tach that uses the CDI exciter lead for a signal source. Most use the primary lead. I have seen a few that take signal from the HT lead, via inductive pickup. What do the tach installation instruction say? I know it's a Captain Obvious question, still have to ask.
     
  8. Deoodles

    Deoodles Well-Known Member

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    Chinese tach. 2 Positive . 2 negative and 1 signal wire. No instructions. I thought feed would be the wire that feeds the coil.
     
  9. Deoodles

    Deoodles Well-Known Member

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    Frustration is a little high but I found the wire I need. I used a posi tap connector when I had the old harness in the bike. I searched the old harness for the witness marks from the old connector and found it. B/Y off the CDI to the ignition coil. I’ll give it a go tomorrow. Thanks!
     
  10. allenp42

    allenp42 Well-Known Member

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    Late to the party. Not familiar with clones, but I think you picked the correct wire, which is the one that pulses the HT (ignition) coil.

    For sure, it is not brown/red, green or black/white. Red/white is a "maybe" but unlikely.
     
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  11. Deoodles

    Deoodles Well-Known Member

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    I should have known not to panic. I ran a wire from the coil feed to the headlight bucket inside the harness I confused it with black white which turns the motor off. Once I realized the two wires were switched it was an easy fix my tach is good my kill switch on the handlebars works everything works now. I just have to button it up and take it out and see how it does I used Molex connectors for everything except signals. They are bullet. Everything is soldered and all pins inspected for proper fit into the connectors. It was work but my hope is that it now lasts as long as I have the bike. Amazing what you can do by simply walking away from an issue.
     
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  12. cjpayne

    cjpayne Well-Known Member

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    I've had to do that a few times.lol
     
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  13. racerx

    racerx Administrator
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    Anyone who really learns the electrical systems of these bikes goes through this, ask me how I know. Even the Honda schematics + color codings have some ambiguities to master...the hard way. If it helps, think of this as M.E. class...without loan debt.;)
     
  14. Deoodles

    Deoodles Well-Known Member

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    I’m adding this addendum for someone in the future. It still didn’t seem to be running properly. It ran really well during testing. Pat helped talk me through possibilities. Turns out it ran better without the tachometer. I did notice the motor had a miss and the electrical system missed with the motor. It was even visible when watching the tach.
    Turned out to be the tach causing the miss. It had to be interfering with the HT coil signal. I replaced the tachometer and everything is as good as I hoped it would be Very pleased with this upgrade.
     
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  15. cjpayne

    cjpayne Well-Known Member

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    Glad you got it fixed. I've never had a tach cause a miss before. That would have drove me insane trying to figure that one out.lol. Glad you have more patience than I do.
     
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  16. Deoodles

    Deoodles Well-Known Member

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    I wanted to share the results. This was a big job, all LED 12v full wave but I also wanted a system that mimicked newer motorcycles. I hand aimed the LEDs on the lightbulb before I install the bulb. There is no flashing even at idle. I parked under a canopy of trees for this video so that I could verify my headlight wasn’t shining up into the sky.

     
    #36 Deoodles, Sep 19, 2020
    Last edited: Sep 19, 2020
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