Testing coils

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  • R3lease1t
    • Jan 2026

    #1

    Testing coils

    I had to change out my coils last summer due to the fact I wasn't getting any spark. While the ones I switched to were used, it seemed to run ok but I'm still curious if they are putting out what they're supposed to. I tried a friend's off of his 1000 and the bike seemed to have about the same or just a bit more pep. What is a good way to check them to make sure they're putting out correctly? I want to get the most of the bike with my meager budget. If I had $300 to spend I'd just get a dyna s kit but that's not an option at this point.
  • tom203
    Forum Guru
    Past Site Supporter
    • Aug 2010
    • 8925
    • Norway,Maine

    #2
    1977 gs750 ? Include it in your signature as you might have more questions as you tear into this thing. Ignition coils are very durable. You can do a primary and secondary resistance test. See steps 10 and 11 in this link


    be warned that spark plug caps get corroded and give you false secondary ohm readings - unscrew caps from plug wires and measure wire to wire
    1981 gs650L

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

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    • R3lease1t

      #3
      Thanks. Once I get the bike back together I'll have to test it. The engine is currently pulled but could be back in by the end of the week.

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      • tkent02
        Forum LongTimer
        Past Site Supporter
        • Jan 2006
        • 35571
        • Near South Park

        #4
        Why would you need the bike together to test the coils?
        http://img.photobucket.com/albums/v5...tatesMap-1.jpg

        Life is too short to ride an L.

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        • R3lease1t

          #5
          I guess technically I wouldn't have to. I just figured it would be easier with everything connected. I'll see what I can do with them today or tomorrow.

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