Roll Your Own CDI

Discussion in 'Lighting and Electrical' started by rohmell, Apr 3, 2011.

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Are You Going to Roll Your Own CDI?

  1. No, too complicated and difficult.

    24.5%
  2. Yes, but only one, for my own MB.

    33.6%
  3. Yes, a few for my own use.

    33.6%
  4. Yes, many, I'm gonna sell 'em!

    8.2%
  1. rohmell

    rohmell Active Member

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    Found schematics on the Russian motorized bicycle forum:
    Ãëàâíàÿ
    for the CDI, so I'm going to start experimenting, looks very simple and can be tailored for use with any old ignition coil you have lying around.

    CDI 1.jpg
    CDI 2.jpg
     
  2. Skarrd

    Skarrd New Member

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    do you know if this one will perform ignition retard? or does this one just keep advancing like our stock ones do?
     
  3. corgi1

    corgi1 New Member

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    Oh my did you just call him a retard,this is too much ,I have to get some sleep,lol
     
  4. The 26incher

    The 26incher New Member

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  5. Skarrd

    Skarrd New Member

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    LMAO XD nice one.
     
  6. rohmell

    rohmell Active Member

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    The 2nd schematic uses a pot which will allow you to vary the timing manually.
     
  7. DaveC

    DaveC New Member

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    The CDI that banned member jaguar makes automatically retards at upper RPMs. There are two jumpers to pull to further tune the CDI if desired.

    I can give you a link if you PM me.

    I use it and I can tell you first hand it works to lessen vibration in the upper RPM band. My motor has never run smoother, especially for a 66cc. The Puch cylinder head has stiff compression, about 9:1 compaired to the stock 6:1 compression ratio and the CDI fires under those conditions very well. Plug is not quite right with a B8HS but I got my NGK BR9HIX Irridum sparkplug today, right from NGK :)

    Now I gotta plug the hole at a mounting stud weld on my tank :p Re-adjust the clutch and back to ridingbrnot
     
  8. Skarrd

    Skarrd New Member

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    still trying to figure out what he actually changed on the cdi. i got the schematic for the standard kdx200.


    also why'd he get banned?
     
  9. DaveC

    DaveC New Member

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    ..getting into confrontations with the mods. To the point of them pulling his posts.

    I disagree with many things that go on in forums but I like to help people so I usually bite my tounge. I have fired what I call broadsides at people when I think there's an injustice. Gotten threads locked but never banned until I was on the other MB forum and got banned for not doing a search for someone else :/

    I can find him if I have to and I do, I want another ignition box for the racer I'm building brnot
     
  10. rohmell

    rohmell Active Member

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    Some more information about his CDI:
     
  11. Skarrd

    Skarrd New Member

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    yeah that's were i found the schematic.

    honestly i can't see that he really changed all that much. since the base timing is going to be set by the magnets position, perhaps just changing out the capacitor for the 5.0uf size so it tapers off at high rpm rather than just going down farther.
     
  12. Stormsorter

    Stormsorter New Member

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    I did some digging on his site and found this.
    Maybe DaveC would be kind enough to open his up and tell us the markings on the capacitors. My cdi just burnt out and I can't wait 2 weeks so its build one or buy a stock one and I'd rather build the better one.:-||
     
  13. rohmell

    rohmell Active Member

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    The 4.7 uF was changed to 5.7uF, and the 1.5 uF was changed to a metallized polypropylene type.
     
  14. DaveC

    DaveC New Member

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    Thank you for doing that, I consider jaguar a friend and I was reluctant to do that. He put a lot of time into thought and development. I completely understand the "do-it-yourself" nature of motorbikeing. The circuit is so simple I could do knockoff's of his knockoff ;) but I'm not going there....well...maybe after he starts to market them through others :)
     
  15. Stormsorter

    Stormsorter New Member

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    Would be nice if he had a deal with a store here in the states. If he did I would just order one. If so would just get a stock one for now and order his when I had the extra cash.

    Can I assume you meant 5.6uf cant find a 5.7? As for tolerance 10% that's capacitive tolerance and 5% would be ok if not better correct?

    Well after further testing looks like both my cdi and magneto died. Must of burnt up the mag trying to start it before I realized the cdi was dead. So it looks like I'm just getting stock for now. Looks like a proper cdi will have to wait a month or two. Might just go ahead and buy it then but he should at least put it on ebay I'm just not comfortable with paypal alone.
     
  16. rohmell

    rohmell Active Member

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    1.0uF in parallel with the 4.7uF.
     
  17. damo99

    damo99 New Member

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  18. Skarrd

    Skarrd New Member

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    yup that's his. looks like i bought mine just in time.
     
  19. halfevil333

    halfevil333 New Member

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    I've found using the pot alters my timing as well, def' retarded- not advanced!!!
     
  20. decoherence

    decoherence New Member

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    nice! it deft slows me down.
     

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