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Weak Spark Left Coil - Firing on 1 cylinder.

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    Weak Spark Left Coil - Firing on 1 cylinder.

    1981 GS 450TZ - New regulator/stator/battery

    Owned this bike for 5-6 years never had any problems with spark. Replaced regulator after it went bad, bike now charging fine.
    Bike will fire and run on right cylinder. I can get spark out of the left cylinder, but its not strong enough to fire the left cylinder.

    Right Coil reads 3.8 - 3.9 ohms on primary coil and 33 - 34K ohm on the secondary coil.
    Left Coil reads 3.7 - 3.8 ohm on primary coil and 12.45k ohm on the secondary coil.

    So the left coil is bad correct? That being said what is a good replacement.

    Are these 3 ohm Dynateks a good replacement?


    Or how about the 3 ohm Mini-Dynatek coils?
    These high tech, top quality coils are designed for maximum performance. Dynatek Performance Dyna Dual Mini 3 ohm Output Ignition Coil with Wires. Accepts 7 to 8.8mm wires. Coil Part Number: DC1-2. Suzuki GSXR1100 A&O (1986-1992).


    Additionally, is this gonna mess with my stock igniter?

    Thanks for reading,
    Peace&Grease
    Last edited by Guest; 09-22-2015, 05:33 PM.

    #2
    You got primary and secondary mixed up or it's a typo! The stock coils measure about 4 ohms primary - secondary will depend on plug cap brand/condition. Try switching coils around to see if problem moves with the coil. I'd be leery of any coils less than 4 ohms primary- the ignitor might be unhappy!
    Suzuki ignition coils are plentiful on ebay

    you said it's charging fine- do this simple quick test and be sure

    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

    Comment


      #3
      try trimming back the plug wire about 1/4" and reinstall your cap to get to some fresher plug wire. could be that the wire is corroded and not allowing spark to flow efficiently. could also be a plug cap going bad too. and like tom said, you want to look at the dyna 4.0 ohm coils. you could over work your ignitor. i'm dealing with a dyna s now because I didn't know the dyna 3.0 ohm coils would cause an issue and explain a lot with the ignition issues I had

      Comment


        #4
        Recently had similar problems..

        Start with replacing plug wires / boots. If that doesn't do the trick test the coils, ignitor, and signal coils.

        I ended up with an ignitor problem, replaced the signal coils with a dynatech unit (which eliminates the ignitor), and replaced the coils with acel units. Running smooth now!

        Comment


          #5
          Thanks for the replies fellas. I got her running, one of the plugs I'd recently replaced had gone bad. Also clipped a 1/4" off of the plug wire as suggested by 60ratrod.
          I also found that the fuel cock gasket had gone bad and the left carb was sucking gas through the vacuum line. Luckily, I already had a petcock rebuild kit so I'm gonna replace those gaskets.
          Thanks again for the advice!

          Comment


            #6
            Use the petcock kit as a bandade for now, but get a new petcock because that kit won't last. They fail rather quickly

            Comment


              #7
              Originally posted by 60ratrod View Post
              Use the petcock kit as a bandade for now, but get a new petcock because that kit won't last. They fail rather quickly
              It was a new petcock.

              Comment

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