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stick coils?

vinny Dec 28, 2007

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  1. 87kawzl

    87kawzl Well-Known Member

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    The coils vary greatly in price, I searched z1000 and found that you could piece together coils and harness for ~$35 shipped. This is turning out to be an affordable mod if the bike is hit and miss on cylinders firing.
     
  2. R. J.

    R. J. Senior Member

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    Last edited: Feb 13, 2018
  3. 87kawzl

    87kawzl Well-Known Member

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    Is the pigtail long enough on the harnesses to just switch plug ends?
     
  4. Breeze

    Breeze Active Member

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    It looks like it should be. I plan on cutting the ends off the ZL wire and he harness and using a GM connector kit from Napa, exactly like RJ said.
     
  5. Breeze

    Breeze Active Member

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    Well I got some '06 ZX14 coils last night. They are used, but all test good within the factory specs. However, all four coils measure 1.5ohm on the primary side. From what I have seen, the factory specs are 1.2 to 1.6 ohms. If i put two in series, these would total 3.0 ohms, which is higher than the 2.8ohms that the ZL900 calls for. Will this increased resistance have negative effects on the ignitor?

    If so, I guess I could wire them in parallel and add a 0.5 to 1 ohm resistor to each positive cable leading to the coil. Thoughts?
     
  6. kawboy

    kawboy Supporting Member Technical Author

    I have seen this discussed on other forums, and some believe the stick mod does not deliver as hot of a spark as "regular" coils. However, this mod has been around a while, and have not heard of any problems.
     
  7. R. J.

    R. J. Senior Member

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    :hello: So who bought the stick coils from post # 182.
     
  8. prfixer

    prfixer Senior Member Supporting Member

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    0.0 Ohms equals no resistance. Taking something with 3.0 Ohms and adding a 1Ohm resistor gives you now a 4 Ohm resistance rating.
     
  9. R. J.

    R. J. Senior Member

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    :hello:If a circuit has 4 1.5 ohm resistors in parallel the total measured resistance is 1.5 ohms. When resistors are in parallel the total resistance measured will not exceed the smallest resistor. When resistors are in series the total measured resistance is the sum of all the resistors. One or to ohms of resistance in a circuit will not change power output all that much. Remember voltage in a bike when running will range @ 12.8 to say 14.8 VDC. Attached is formulas/equations for finding Voltage/Current/Power/Wattage & Resistance. IMG_5387.JPG
     
  10. Breeze

    Breeze Active Member

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    Well, if the factory specs call for 1.8 - 2.8 ohms and I wire 1 & 4 in series and 2 &3 in series with the ZX14 coils I have, the resistance comes out to 3.0-3.1 ohms. Will that 0.2 - 0.3 ohms make any difference? However, if I wire them in parallel and add a 0.5 - 1.0 ohm resistor, then the resistance should measure 2 ohm, and then I should be okay. Correct? The next question is how big of a 0.5 - 1.0 ohm resistor? 50 watt?

    If I were to wire them in parallel without any resistor, they would only be 1.5 ohms, which is 0.3 below the factory specs. I assume this would not be good on the CDI. Correct?
     
  11. Breeze

    Breeze Active Member

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    Oh, I'm not being clear. I apologize. My question involves wring the coils in parallel with a resistor on each circuit in series with each coil. One resistor in series with each coil. I really don't want to do this, but I'm just looking at my options.
     
    Last edited: Feb 18, 2018
  12. Breeze

    Breeze Active Member

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    So you're saying that if I wire the coils in series, even though they are only 0.2 ohm above ZL900 spec, it should only make a very minor difference (i.e. slightly weaker spark), and not cause any damage to other components?
     
    Last edited: Feb 18, 2018
  13. R. J.

    R. J. Senior Member

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    :hello: Sorry, I was thinking in 10 ths. of ohms & not ohms. So yes one ohm can drop power output as much as 25% in a 12 VDC circuit. From what I read on the first page of this thread you do not need to wire in any extra resistors. You can find more imformation on stick coil conversions on ZRX fourms.
     
    Last edited: Feb 18, 2018
  14. R. J.

    R. J. Senior Member

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  15. prfixer

    prfixer Senior Member Supporting Member

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    I refuse to cut up my stock harness, even this slightly. I used 4 insulated spade connectors on the coil harness and they plug right into the stock harness.
     
    kvalheim likes this.
  16. R. J.

    R. J. Senior Member

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    :hello: Ya I here ya on that. :notworthy:. The P O of my ZL 10 had my wiring harness loom so hacked up I spent 2 days putting it all back to stock form. For some reason he painted the frame with the harness on the bike. I was able to get all the paint off the loom using acetone. Then I got all the paint off the frame. Under all that mess was a perfect frame. Go figure. So what bike was the stick coils from that you used & do you know how many ohms they are. Thank's.
     
  17. prfixer

    prfixer Senior Member Supporting Member

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    They are from a 1400 Connie but I never put an ohm meter to them. No issues since installation though.
     
  18. R. J.

    R. J. Senior Member

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    :hello: Thank's. :notworthy:.
     
  19. DirtyRider

    DirtyRider Member

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    I'm thinking of doing this mod. I previously did it to a 454 LTD using 2006 cbr1000 coils. Using just the two coils from the two sets of stock coil wires required resistors. Using two sets of coils from the two sets of stock coil wires in series negates the need for resistors on the 900 compared to the 450 and, as long as the coils you use match the stock resistance of the stock coils without going to low, still gives you the benefit of denser spark due to the resistance of the plug wires no longer being a factor. I'd be interested in doing a tech write up when I get around to it.
     
  20. markus56

    markus56 ZL-OA Co-owner Staff Member Administrator Super Moderator Supporting Member

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    We would welcome your tech write up if you want to do one.
     

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