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91' gsxr 750 wont produce spark

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  • 91' gsxr 750 wont produce spark

    recently acquired this bike and trying to get it started... no spark to the spark plugs when i sit them ontop of engine head. got new coils and plug leads and plugs.
    the primary winding on the coil measures 2.6ohm and secondary measures 37,000 ohm.
    signal generator measures 170ohm.
    All these figures seem acceptable by the book.
    New battery.

    Got a second hand CDI and plugged it in...no difference. Checked for continuity along whole ignition system according to wiring diagram..all good.
    So if these are all working why arent i getting any sign of spark. cables to the coil seem to have a 12v potential when voltmeter put accross it and -ve terminal on battery.

    Should probably skip to the important bit. Im unsure if it is turning over correctly, it sounds like its having a hard time turning over, check out the youtube clip of my bike:
    What could be wrong with my 91' gsxr 750. No spark - YouTube
    Originally posted by Ambian
    When I was a wee boy I use to whack off to escort adds in the yellow pages, o'course... those yellow women on the pages forever gave me a warped view of the Simpsons...

  • #2
    Got a wiring diagram link?

    A lot of the CDI units have some cutouts for the sidestand and clutch with etc that will kill spark.
    Being an Australian is not an excuse for being dumb and racist.

    Comment


    • #3
      Dude put the battery in the bike and use the correct wiring...

      You have a long run of small wire...

      Probably getting substantial volt drop...

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      • #4
        i have high current wiring so no voltage drop, its less than half a meter to a big battery. same thing occured with original battery in wired correctly.

        does the turning over sound right?

        wiring diagram to whoever wants it: http://img222.imageshack.us/img222/1890/scan0002nw.jpg

        I push the side stand up, i know that doesnt mean its working. I am getting 12v +ve to both wires going to the sidestand...that doesnt seem right
        Originally posted by Ambian
        When I was a wee boy I use to whack off to escort adds in the yellow pages, o'course... those yellow women on the pages forever gave me a warped view of the Simpsons...

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        • #5
          If that diagram is correct, at the sidestand you should have 12v+ on the green and the black/white should be ground.

          Mind you, that diagram has at least one error.

          Edit : What voltage is on the black white to the ignitor box? It should the same ground wire as the sidestand switch. Seems like you have the ground disconnected.
          Being an Australian is not an excuse for being dumb and racist.

          Comment


          • #6
            Mate.. killswitch enable...
            Look at voltage to coil..12v + ( check both contacts...)
            Switched from ecu/controller..earth....ok.
            is key alarm type???
            check for wire not on battery...is a bit hard to see...hanging down/or connector not making a good contact??
            Clutch switch etc...bypass with paperclips' don't allow to contact/earth on frame....
            get another beer......stand back.....good luck





            did u check fuses.....(jump battery error?? )
            Last edited by GsxInShed; 27-10-2012, 05:51 PM. Reason: jumped to conclusion
            " Imagination is the seed of life..."

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            • #7
              Other thing is check resistance of the windings of the crank pickups. Make sure they don't earth out as well
              Every one has a story.....

              http://www.perthstreetbikes.com/foru...updates-82338/

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              • #8
                Got rid of bike battery and replaced with new car battery on jumper leads. Turns over much quicker and there is a small spark from the one plug that is connected out of its socket in the plug lead. Doesnt look like its enough spark to ignite the petrol thats spraying out of the spark plug hole...is the carby flooding if its spraying out
                Originally posted by Ambian
                When I was a wee boy I use to whack off to escort adds in the yellow pages, o'course... those yellow women on the pages forever gave me a warped view of the Simpsons...

                Comment


                • #9
                  Check kill switch wiring, mine had an intermittent problem related to this, after i took the fairings off and tidied up the wiring. Connectors would be 20 yrs old now, disturbing them somehow caused a break in the killswich wiring at the connector.
                  'Tis easier to ask forgiveness, than it is to get permission..

                  Comment


                  • #10
                    Originally posted by SP33D View Post
                    .is the carby flooding if its spraying out
                    Yes
                    Being an Australian is not an excuse for being dumb and racist.

                    Comment


                    • #11
                      update:

                      no spark due to failed CDI. CDI was giving output to 2 cylinders and not the other 2. I bought a CDI from wreckers and it did the same thing. Bought a third one from another wrecker...worked. shame these wreckers cant test them before they put them up for sale...
                      Originally posted by Ambian
                      When I was a wee boy I use to whack off to escort adds in the yellow pages, o'course... those yellow women on the pages forever gave me a warped view of the Simpsons...

                      Comment


                      • #12
                        still got the faulty ones? I wouldn't mind seeing if I can fix them
                        Being an Australian is not an excuse for being dumb and racist.

                        Comment


                        • #13
                          Double check all wiring dude
                          Every one has a story.....

                          http://www.perthstreetbikes.com/foru...updates-82338/

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