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CDI Volt Drop

Discussion in 'The Garage' started by Ozboy, Jun 9, 2018.

  1. Ozboy

    Ozboy XS650 Addict

    Hey Gurus
    Been chasing a volt drop somewhere on the bike and it seems to be from the CDI. I am down about .5v every time i plug it back in.
    Is this correct for powering up the CDI?
     
  2. gggGary

    gggGary I'm listening, change my mind XS650.com Supporter Top Contributor

    Stock TCI??
    yes TCI pulls some amperage, AFAIK it powers the coil for a little bit. It has a timer that shuts it down if you don't spin the motor. It has to have some internal draw but probably not much, never noticed one get warm. Bike running?
    Have you rebuilt the ignition switch?
     
    Ozboy likes this.
  3. Ozboy

    Ozboy XS650 Addict

    Hey gggGary
    Fantastic man thanks for the quick reply.
    I thought the system pulled down some juice as i read somewhere 3A turning the key on, stock Alternator and CDI. No ignition rebuild.
    It was running fine but most of this wiring is 40yr crud.
    i am getting ready to upgrade the ignition and just running over everything before starting into it.
    Thanks
     
  4. gggGary

    gggGary I'm listening, change my mind XS650.com Supporter Top Contributor

    Stock the big draw is the alternator, rotor is 5-6 ohms. tail light also comes on with key. iggy switch contact clean up is an easy R&R and will almost always give some benefit. Same for the kill switch.
     
    Ozboy likes this.
  5. Ozboy

    Ozboy XS650 Addict

    Cheers
    I will strip them down and silcone grease the contacts as well as cleaning all plugs and lightly silicone grease too replacing the junk wires as I go.
    Big Thanks.
     
    gggGary likes this.
  6. 650Skull

    650Skull SSSSSSSSSlither Top Contributor

    May need to clarify what you have and what your doing................79 Specials were Factory points ignition models....i see you have bought a Hughs PMA with CDI ignition...........If your 79 has been converted to Factory Electronic ignition it is a TCI........??????.......Factory stock alternator and CDI.....doesn't compute ????
     
  7. xjwmx

    xjwmx It's just the unknown. Top Contributor

    7,458
    3,778
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    U.S.A.
    Lots of ppl think the TCI ignition is fine, maybe best.
     
  8. 650Skull

    650Skull SSSSSSSSSlither Top Contributor

    I forgot...........yours is a Japanese import....no points????...... Factory TCI????..... BS34's????................Should post this information in your signature for peoples future reference........These Japanese Models were different, (in terms of components to the year/model) to the rest of the world....
     
  9. Ozboy

    Ozboy XS650 Addict

    Yeah sorry guys i will update this. It has been hard trying to find the correct wiring diagram.
    I am using parts of the SH and some of SE diagrams.
    Not sure where i was getting the CDI from but what i mean is TCI.
    Thanks
     
    Last edited: Jun 9, 2018

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