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no spark gs650e

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    #1

    no spark gs650e

    hey guys,

    so my bike wouldn't start up a few weeks ago. i went ahead and totally cleaned and rebuilt carbs hoping that was the problem -- guess it wasn't.

    it looks like i'm not getting any spark at all from the plugs when i go to start it. i pulled them out and grounded them on the engine and saw nothing when i hit the starter. what are the most likely causes of this problem?

    thanks again.
    Tags: None
    #2
    So it cranks OK, and you have set petcock on "PR' spot to fill fuel bowls after your carb work? have you tried this link?

    electrical_odd-n-ends
    http://members.dslextreme.com/users/storagecliff/images/electrical_odd-n-ends.html#A17


    Recheck coil and ignitor connections in case they got knocked off- you'll likely have to pull tank to check for 12 volts at ignition coils.
    1981 gs650L

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

    Comment

      #3
      what are the "primary" and "secondary" HT windings?

      Comment

        #4
        Originally posted by underground View Post
        what are the "primary" and "secondary" HT windings?
        On ignition coils. With tank off, you will see the connectors, The small spades connect to primary circuit, the two spark plug wires form the secondary circuit.You would measure these disconnected from harness. It's unlikely that coils would be bad, but the plug caps (the holder for spark plug often cause trouble.) Make sure you have 12 volts at orange/white wire spade connector with ignition "on" and kill switch in "run". Put one multimeter probe on this o/w wire and other on good ground.
        1981 gs650L

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

        Comment

          #5
          okay so,

          i checked the contacts to ignition coils, they were crappy so i replaced them. now it starts on starting fluid -- but only fires on cylinders 1 + 3, but not 2 + 4.

          1 + 3's headers are hot 2 + 4 are cold. any suggestions?

          Comment

            #6
            Originally posted by underground View Post
            okay so,

            i checked the contacts to ignition coils, they were crappy so i replaced them. now it starts on starting fluid -- but only fires on cylinders 1 + 3, but not 2 + 4.

            1 + 3's headers are hot 2 + 4 are cold. any suggestions?
            So you're using starting fluid to start it and it stays running (at least on 1 and 3 ) on its own???
            1981 gs650L

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

            Comment

              #7
              no, it idles until the starter fluid burns away. then the engine dies.

              really puzzling.

              Comment

                #8
                Puzzling too that 1 and 3 fire as they are different coils. Now did you pull the 2 and 4 plugs and ground them to the block to see if there is even a hint of spark?

                You should probably try fresh plugs all around but if you still don't have spark on 2 and 4 you should suspect the plug caps. They can go bad over time, become overly resistant and not allow spark to pass. They screw in to the plug wire so easy to replace and around $8 a piece. I've had this happen on a couple of my bikes over the years.

                And don't use starter fluid, that stuff can do some serious damage if over used (i.e. blow the head gasket or even the head itself) put some gas in a spray bottle or better yet clean and rebuild the carbs.

                Good luck and let us know when you get her to run.

                cheers,
                Spyug

                Comment

                  #9
                  plugs are fairly new (less than 3 months) but i guess they could fail. caps are probably older than me. i'm replacing both.

                  but what are the odds that two caps or plugs (the ones on 2 + 4) failed at the same time? i would expect failure on only one cylinder at a time??

                  i could probably use a new battery. when the bike is off the battery hovers ~12v. that's a bit low right? shouldn't it be at like ~12.5?

                  Comment

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