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GS1000G Running on 1, 2, and 4 Number 3 remains dead

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    GS1000G Running on 1, 2, and 4 Number 3 remains dead

    Replaced plug twice, cleaned carbs twice now. All the same jets etc. Compression as follows: 1 = 140psi, 2 = 130psi, 3 = 130psi, 4 = About 135psi - all 4 cylinders still within Suzuki specs. Bike runs on the mentioned three cylinders only. Number 3 plugs come out wet every time I check.

    Put number 2 HT lead on 3 and number 3 HT lead on 2 but still same result.

    Valve clearances was done a week ago and got most of them to about 0.05mm clearance so I do not believe that it is valve clearances. The number 4 inlet valve clearance is slightly over 0.08 mm because I cannot find a thicker shim to bring it down.

    Even if there is a slightly burned valve on 3, it should still run with the usual misfire that goes with it

    Anyone ever had such a problem? - maybe time for the junkyard?

    #2
    Found the problem. When removing carbs I always put a piece of rag into the inlet to ensure nothing gets in there while I am working on the carbs. For some dumb reason, I did not remove the rag on cylinder 3
    So please do make fun of me, I have it coming

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      #3
      Ha !

      Good that you found it.

      So your description of the problem could have said "this all started after the last time I put the carbs back on".

      Good troubleshooting. You checked compression, and swapped plugs and swapped sparkplug leads, and observed symptoms stay on same cylinder. ....and concluded must be carb related. . . and you were correct.

      Had 850G for 14 years. Now have GK since 2005.
      GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


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        #4
        One issue you gave yourself now though are those valve clearances. You want them at the upper end near .08mm and NOT .04 or you could be replacing valves soon
        sigpic
        Cowboy Up or Quit. - Run Free Lou and Rest in Peace

        1981 GS550T - My First
        1981 GS550L - My Eldest Daughter's
        2007 GSF1250SA Bandit - My touring bike

        Sit tall in the saddle Hold your head up high
        Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
        and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

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          #5
          Originally posted by Danie.e View Post
          Found the problem. When removing carbs I always put a piece of rag into the inlet to ensure nothing gets in there while I am working on the carbs. For some dumb reason, I did not remove the rag on cylinder 3
          So please do make fun of me, I have it coming
          Ah, your just the 363rd member to make that mistake
          1978 GS 1000 (since new)
          1979 GS 1000 (The Fridge, superbike replica project)
          1978 GS 1000 (parts)
          1981 GS 850 (anyone want a project?)
          1981 GPZ 550 (backroad screamer)
          1970 450 Mk IIID (THUMP!)
          2007 DRz 400S
          1999 ATK 490ES
          1994 DR 350SES

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