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1980 GS1100E mixture screws

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    #1

    1980 GS1100E mixture screws

    I have read all the posts on mixture screws for adjusting idle/rich/lean conditions.

    where are they located on my mikuni cv carbs ? I see 1 adjusting nut (like a thumbscrew) that i think adjusts my idle.

    I have searched and have not found what I think I need. trying to get a rough idle and plug fouling (lean condition).

    i am adjusting valves today, and while i have the tank off thought I could look at these screw settings.

    any info would be much appreciated.

    Thx,

    Mike
    Tags: None
    #2
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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      #3
      Thank you very much !!!

      there appears to be metal caps over these. how do I get to the adjustment screws, or do i just not touch them ?
      Last edited by Guest; 09-06-2009, 12:16 PM.

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        #4
        They are pre-set at the factory and are supposed to 'not be messed with', but we all mess with them. In order to get them out without screwing up the screw head underneath is take a sheet metal screw, place it in the tiny hole and put enough turns to get it to hold the cap and then pull it out with a pair of pliers. If that fails use a small drill bit and drill the cap out being VERY CAREFUL that you do not bugger up the threads of the screw below(they are brass and very soft). The screw head under the cap is very close to the cap so check your progress frequently while drilling.

        Good Luck!

        Oh yea, if you are going to remove the screws count the number of turns 'IN' or until they are seated then take them out, that way you will know how to adjust them when you put them back in.

        Scud

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          #5
          Rather then trying to remove them Id just screw them down and count the turns then back them off to where you want them. Get a screw driver thats an EXACT fit for the mixture screws, the heads bugger up real easy then you cant do anything with them. No matter how much Ive soaked them with penetrating oil theres a 50/50 chance of getting them out without ruining them to change the little o-rings on the bottom. Once they are ruined Ive had no luck at all getting them out. You need a bigger headed screw driver then will fit down the hole so you have to grind the sides down to fit. The ones that do fit have too small of a head on them to work without ruining the screw slot. http://www.cycleorings.com/#BS_Series_O-ring_Kit get o-ring kits here
          Last edited by Guest; 09-10-2009, 12:33 PM.

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