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Pinned Coil On Plug conversions - COP

Discussion in 'Tech Tips' started by Linkin, Aug 24, 2017.

  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The primary resistance on my FZR400 coils is 1.8 to 2.2 (service manual), so 0.9 to 1.1 needed for COP's not many in that range.
     
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  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    You can use COP'S with a higher primary resistance, up to 3 Ohm's (wired in series) or a touch more,
    They will draw less current through your TCI and it'll last longer too
     
  3. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I made a note in my cheat sheets that the Denso 129700-5350 COPs are meant to be 1.1 Ohms. They're from a Kawasaki ER6.

    https://tinyurl.com/yymfv6gd
     
  4. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Last edited: Oct 25, 2020
  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Spec's i found for them were 1.1 Ohm's to 1.5 Ohm's on the first page here.
    You won't notice any difference in spark if they are 1.5 Ohm primary each
     
  6. Klapparbaver

    Klapparbaver Active Member Premium Member

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    20201029_163505_HDR.jpg 20201029_144952.jpg zx9r coils work beautifully :) Made a little sub harness with connectors from jaydee and spliced the 2 positives together to use a 3 pin connector for the sub harness to the original harness. Starts up so much easier and runs very nicely. View attachment 47414 View attachment 47415
     
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  7. Klapparbaver

    Klapparbaver Active Member Premium Member

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    Update on the new setup. Tacho gets a bit funky around 7 to 8000 rpm. Jumps around a bit if holding steady at those revs.
    Makes more power because my clutch is now slipping :)
     
  8. kz1000a

    kz1000a Active Member

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    Finally got my ZX14 COP’s and subloom delivered. Also got the “proposed” connector and pigtail leads delivered.
    Time to assemble!
    But wait!
    There’s more!
    Can anyone confirm if the wiring in the pic will work?
    Yellow boxed contents are from the donor bike.
    Red boxed contents is my proposed connection to ZXR original primary leads.

    5533B9C0-352C-41C7-A024-45BF6D903506.jpeg
     
  9. jmw76

    jmw76 Well-Known Member

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    You need to check the primary resistance of the original coils on the ZXR250. If these are 3 ohms or so then probably best to connect COP 1 & 4 in series and 2 & 3 in series then wire each assembly to the standard loom, rather than a parralel connection as you have suggested. A number of other members have made this conversion and I am sure they will comment.

    Peter.
     
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  10. kz1000a

    kz1000a Active Member

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    Cheers jmw76

    Just back probed the primary’s between red wire and any other dashed wire.
    Measured 1.4 ohm.
    Should be approx. double that, according to OEM spec.
    Think that I got bad info from WWW

    N.B. Seen much good info on 2fifty site, reguards series configurations between 1&4, 2&3 but was trying to avoid chopping up subloom.

    Believe that this is the desired configuration.

    COPs ZXR250.jpg
     
  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    If you want to try and avoid chopping up the loom, figure out how to remove the pins from the plugs themselves, or you may be able to get just the crimp pins for the plugs if any need to be re-pinned shorter - redoing the pins at either end is feasible, avoids cutting & soldering & taping
     
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  12. kz1000a

    kz1000a Active Member

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    Yep, will give this a try.
     
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  13. kz1000a

    kz1000a Active Member

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    OK, I know this will end in tears if I force it, so does anyone know how to remove the yellow locking wedge?

    F07B1D17-20E6-4180-AA42-09C99562F5A4.png 96DFC3E1-D908-4ACA-85EA-A6425B32C925.jpeg
     
  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Very likely a jewellers screwdriver in from the back - you'll be looking for a locking tab that lifts up when the yellow piece is inserted

    From the diagram it doesn't look like there's a locking tab on the top, BUT that depends if it's 100% accurate
     
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  15. Jethalter

    Jethalter Well-Known Member

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    129700-3881

    i just got a pair of these, resistance test primary 1.0 ohm, not 2.5-3.1 Ohm primary as listed.
     
  16. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    For which bike?

    Here's some details which specs them out at 0.8-1.2
    https://forums.pelicanparts.com/7096463-post5.html

    So from that if you wire them in series, you should have a working resistance of about 2 OHM which is likely acceptable an close to your OEM coil resistance, but I see you got two, not four, so if they're going onto a twin that resistance may be too low and will overload the transistors
     
  17. Jethalter

    Jethalter Well-Known Member

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    yeah but dont list them as 2.5-3.1 primary when they aint that. list the specs of the actual coil.
     
  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    what ? you expect every detail posted on this forum to be 100% accurate?

    who the fuk are you anyway?

    go do your own bloody research!
     
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  19. Jethalter

    Jethalter Well-Known Member

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    I was just saying what the primary resistance was and that the original post on those coils was incorrect.

    But aye you wanna be like that. Go **** yourself.
     
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  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    So I have a set of Denso 129700-4840 COPs

    I realise 129700-5430 are recommended for the ZXR250

    Can one of the white mans magic experts tell me why I cant/can use what I have :D

    129700-4840
    1.6 - 1.7 Ohm's primary
    around 13K Ohm's secondary
    Length 142mm

    129700-5430,
    1.1 Ohm's to 1.5 Ohm's Primary,
    10.8 K Ohm's to 16.2 K Ohm's Secondary


    They are long enough :idk:

    IMG_3775.JPG
     

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