Bad coils?

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  • SirFoxx
    • Mar 2026

    #1

    Bad coils?

    So in my troubleshooting of my no spark problem, I tested the secondaries of both coils (between the HT caps) and they both read open...From the article I found, arent they both supposed to be between 30k-35k ohms?

    The primary sides read 4.2 and 5.2 respectively. A little high, IMO.

    I checked the signal generator resistance, and both were 163 ohm, so that is good. Once I figure out the HT coil issue, I can then test the igniter.
  • SirFoxx

    #2
    I just found out that both my coils are good! I thought that having both coils go bad is a bit strange. Both coils checked out at 34k ohms, which is still within tolerance. The culprit are the boots. I managed to get 2 good boots out of the 4, and checked the coils with those. Having said that, what resistor boots are suitable replacements for the bike? What does the resistance need to be? When I checked the boots, they were around 10k ohms.

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    • fastbysuzuki
      Forum Mentor
      Past Site Supporter
      • Nov 2012
      • 996
      • Wyre, Lancashire.uk

      #3
      What bike is this? It would be good if you put your bike model in your signature then when you post it will be there for everyone to see and it saves typing it every time you post.
      The big guy up there rides a Suzuki (this I know)
      1981 gs850gx

      1999 RF900
      past bikes. RF900
      TL1000s
      Hayabusa
      gsx 750f x2
      197cc Francis Barnett
      various British nails

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      • Buffalo Bill
        Forum Guru
        Past Site Supporter
        Super Site Supporter
        • Jun 2008
        • 6008
        • New Buffalo, Michigan 49117

        #4
        You can still buy OEM resister caps, or NGK resister caps.
        1982 GS1100G-
        1990 GSX750/1127
        1987 Honda CBR600F Hurricane
        1985 Kawasaki GPz750

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        • Guest

          #5
          5 ohm caps can be purchased at most foreign auto parts stores, bring your old ones to match up

          Comment

          • SirFoxx

            #6
            Originally posted by fastbysuzuki
            What bike is this? It would be good if you put your bike model in your signature then when you post it will be there for everyone to see and it saves typing it every time you post.
            My bad. Just added it!
            Originally posted by hjfisk
            5 ohm caps can be purchased at most foreign auto parts stores, bring your old ones to match up
            What store are you referring to..?

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            • SirFoxx

              #7
              So I did the test with the ohm meter to check the igniter, and it did not produce spark on either the #1 or #2 spark plug. I did test the coils by connecting 12v and temporarily grounding them to produce spark. It did spark, so the coil is fine. The signal generator's resistance is 162 ohm on both sets of wires, so that is okay.

              I found the article on bike cliffs site about using two gm HEI modules for a gs1000g. Would this work for my bike? I noticed the guts of my ignitor are slightly different than the one in the tutorial.
              Last edited by Guest; 09-05-2016, 11:47 PM.

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