Racing CDI installation help!

Discussion in 'Performance Mods' started by MAFirst4, Jan 30, 2014.

  1. MAFirst4

    MAFirst4 Member

    Hey I was wondering if anyone has used this CDI on their 66cc bikes before? If so any help on wiring it up or any pics of your setup would be appreciated or links to the wiring diagram! Can't seem to get the wires in the right place from the Magneto to the Cdi to the coil to the kill switch.......Here is what I have, got em for 20 bucks so figured it's worth a shot....

    CDI

    image.jpg
    Coil
    image.jpg
     

  2. Fabian

    Fabian Well-Known Member

    Does that CDI have adjustable ignition curves?
     
  3. MAFirst4

    MAFirst4 Member

    No. Just supplies a little more juice. Allows for higher rpm. I would like to get an adjustable one but don't have the cash right now so figured I'd give this a try....
     
  4. jaguar

    jaguar Well-Known Member

    I think that CDI requires a trigger pulse, unlike the Grubee CDI which just needs the two wires from the stator coil.
     
  5. MAFirst4

    MAFirst4 Member

    What is a trigger pulse?
     
  6. HeadSmess

    HeadSmess Well-Known Member

    that is the CDI unit from a pitbike, a lifan, a... anything small, fourstroked and with a seperate trigger coil. they also make no difference to the performance of said engines, and if anything...are delicate and easily FRIED. i particularly like how the label has some type of curve, one axis labelled in PS (basically horsepower but more german) and the other axis is in KM/h! which has nothing (other than gear ratios) to do with engine speed!


    an advance curve is measured as degrees from TDC over RPM.(top dead center, revolutions per minute)

    whats a trigger pulse?

    well... in a CDI system, theres two coils, one produces a large voltage, which is used to charge a capacitor (the C from CDI...capacitor discharge ignition)

    the second, small coil is located in the right place in regards to TDC. once the capacitor is charged, when this small coil produces its low voltage, the capacitor is dicharged through the (ignition) coil, producing a spark.


    a HT CDI is fundamentally the same, but uses only one coil... it produces AC electricity. the capacitor is charged on, say, the POSITIVE cycle, and is discharged as the voltage on the NEGATIVE cycle reaches a certain threshold.

    most "performance" cdi units for the HT simply alter the trigger voltage on the negative cycle, that can be used to change the advance curves, by using what are called CR delay circuits, or... a capacitor and a resistor. the resistor affects how fast the capacitor charges up. (this is NOT the main discharge capacitor, mind you!). this can "delay" the trigger point, which creates RETARDED spark. the standard HT cdi keeps ADVANCING, and 2 strokes dont like that much, requiring at a certain point...retarding of the spark.


    ha ha, retard :dunce: :jester:


    no, you CANT redesign the CDI unit you have pictured. sorry :(
     
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  7. HeadSmess

    HeadSmess Well-Known Member

    and...looking at the one you pictured... it looks like the type intended for the IRK kits... useless freakin things that just make you lose torque and get nasty kickback when starting them...
     
  8. MAFirst4

    MAFirst4 Member

    Alright so throw this bad boy out! Im ordering a real adjustable American made Cdi for 66cc engines. Pricey but ain't no going back now! Gonna go with the one designed by huffydavison. Heard good things. Thanks for all your help guys!
     
  9. keatonx

    keatonx Member

    Even worse is this CDI is for the honda crf/xr50 clones, which usually have a multi gear transmission! They couldn't have put any less effort into that graph!
     
  10. Fabian

    Fabian Well-Known Member

    Does the HuffyDavidson CDI have adjustable advance curves?
     
  11. MAFirst4

    MAFirst4 Member

  12. Fabian

    Fabian Well-Known Member

    Can you post a hi-res photo showing the jumper switches that control the ignition curve of the HuffyDavidson CDI.
     
  13. MAFirst4

    MAFirst4 Member

  14. Fabian

    Fabian Well-Known Member

    What is the difference between the CDI you have posted and the other CDI advertised for the same price but filled with a potting resin?
    How do you adjust the jumpers on the potted CDI?
     
  15. MAFirst4

    MAFirst4 Member

    The one I got is adjustable and the other lightning is not. He just covered it up to secure the design? Not sure. But I wanted the adjustable one!
     
  16. Fabian

    Fabian Well-Known Member

    Can you please post high resolution photos of the circuit board of the HuffyDavidson CDI.

    I am interested in comparing how their CDI circuit layout differs from that of the Jaguar "adjustable" CDI.
     
  17. Fabian

    Fabian Well-Known Member

    I want to try out a HuffyDavidson CDI but i "want" the adjustable one as well. I'm not interested in paying good money only to have a non adjustable CDI, when you can buy a Jaguar CDI that "is" adjustable.
     
  18. MAFirst4

    MAFirst4 Member

    Ya those are the two main Cdi's out there. Heard huffydavidson is good quality and works great, as it should for 85 bucks!!! Also heard jaguars works well too, it's just on back order right now...
    I get the Cdi next week and I will post an update on how it performs and a few pics as well...
     
    Fabian likes this.
  19. Fabian

    Fabian Well-Known Member

    That would be greatly appreciated.
     
  20. Pablo

    Pablo Motored Bikes Sponsor

    I'm really curious to see what you actually receive. I'm thinking that is just an earlier Lightning version. Old stock?

    Plus when you were emailing me for help, and wanted to buy just a coil, maybe you noticed that we carry the Lightning CDI? ($80, but dang not adjustable!!! :jester:)
     
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