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Removing the resistors from the spark plug wires

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    #1

    Removing the resistors from the spark plug wires

    Has anyone removed the resistors from the spark plug wires. While I was "debugging" my 81GS750E my co-worker recommended that I do this. I cut four 1/8" brass replacements so that there is nowhere neer the 40K resistance it was reading before. It didn't seem to make any change, but I can't say for sure since the bike was running so poorly at the time. Just curious... it runs fine without them, but better?

    Thanks!

    Roger Moore
    Tags: None
    #2
    Well, the resistors are there to step up the voltage before discharge. The coils are going to fire the plugs at somewhere between 5,000 and 15,000 volts. The resistors get that spike up, for a stronger spark. You're not really going to notice a big performance change with this mod. Personally i'd keep it stock for overall streetability.


    Tim

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      #3
      Resistors will actually cause a voltage drop...they will not step up voltage. Transformers do that. Resistors are placed in sparkplug wires and sparkplugs to keep down electrical noise.

      Pulling the resistors will make little difference in performance.

      Hap

      Comment

        #4
        Humm, I'm not sure I understand how resistors can increase spark. Ohms law would seem to indicate that the current seen after resistors would be lower than if there were no resistors; i.e.,

        10,000 Volts accross 40K ohms is .25 amps

        10,000 Volts across 4 ohms is 2500 amps

        which should create the hotter spark?

        I'm of the understanding that these resistors would only reduce the noise picked up in automobile radios, and that the reason we ever went to resistor plugs and wires was for FCC regulations. We also had to increase the capability of our ignition systems to overcome this. My thinking was this would lower the load on the system and make it more effiecient -- though I must admit "I" didn't come up with this fix, my co-worker did. I didn't know that there were resistors in the end of these wires at all until he showed me, but I did seem to understand why it may help.

        But I could be wrong....

        Roger Moore

        Comment

          #5
          Hap, I was posting my response while you were posting yours. I didn't read yours first, just so you know . You did confirm my thoughts though...

          Roger

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            #6
            Originally posted by Roger Moore
            Hap, I was posting my response while you were posting yours. I didn't read yours first, just so you know . You did confirm my thoughts though...

            Roger
            That just tells me that great minds think alike!

            Hap
            Ducks for cover, waiting for the abuse to be heaped upon him!

            Comment

              #7
              I've always removed the resisters, but can not prove it helps anything, but I do know it's never caused any problems.

              Comment

                #8
                I have resistance type wires with the Dyna coils on my bike. I was told it wouldn't make any difference either way when I bought the coils...

                Comment

                  #9
                  Originally posted by Hap Call
                  Originally posted by Roger Moore
                  Hap, I was posting my response while you were posting yours. I didn't read yours first, just so you know . You did confirm my thoughts though...

                  Roger
                  That just tells me that great minds think alike!

                  Hap
                  Ducks for cover, waiting for the abuse to be heaped upon him!
                  GREAT BIG HEADS MAYBE

                  Comment

                    #10
                    GREAT BIG HEADS MAYBE
                    OK, where are my calipers! Line up... :P

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