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'80 GS 550 L -- Carb Tuning Question

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    #1

    '80 GS 550 L -- Carb Tuning Question

    Hi All,

    It has been some time since I've been on the forum. I had completely rebuilt my bike a few years ago adding a K&N box Air Filter and a Mac 4 into 1 pipe.

    I've ordered a stage 2 Sigma6 racing jet kit as the bike was having lots of running problems (eventually it just wouldn't start, and so it has sat for some years). I would have preferred a Dyno kit as they provide the exact parts required, while the Sigma6 kit gives you a general range.

    With the enhanced airflow that I noted above, does anyone have experience to comment on if this combination sounds accurate:

    Carbs Home + Groups = Main Jets 97.5 or 100?
    Carbs Forum + Blogs = Main Jets 100 or 102.5?
    Mixture Screws = 3.5 turns out?

    Thank you,
    Drew
    Tags: None
    #2
    That should read:

    Carbs 1 & 4 = Main Jets 97.5 or 100?
    Carbs 2 & 3 - Main Jets 100 or 102.5?

    Comment

      #3
      Sorry, no recommendations for a fix on the carbs from me.

      It is possible to edit a post for clarity, then delete your second one.

      The number sign thing got you. For what it's worth:

      This is a real oddity that I’ve not seen on any other forum. It showed up after the site upgrade a few months ago. I’m sure, among all that Frank administrator does here, this is not a priority, I was just curious, is all. Folks keep asking about it.
      Have we figured out why this happen or how to fix this? There are probably more than 30. That’s just as far as I went to illustrate the point.

      when we use a hashtag followed by a numeral: (first set I added a space between the # and the numeral)
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      this set with no space:
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      Comment

        #4
        How are the valve clearances? Tight valves can keep a bike from starting, not to mention, it will result in burned valves and valve seats.
        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

        Comment

          #5
          Thank you for the heads up on the "#" situation

          Regarding the valves, they were lapped and shimmed during the rebuild stage. Cylinders were honed and rings replaced. The carbs I had cleaned and rebuilt by a shop. New OEM intake boots and intake boot orings. The idling was always a problem, either too high or too low.. surging etc. It ran terrific in both low, mid, and high range! It was always just the idling and starting that was an issue. Became harder and harder to start, ended up using starter fluid, and then eventually even that wouldn't work
          Last edited by jboge123; 05-08-2023, 08:44 PM.

          Comment

            #6
            You don't say why you didn't get the Dynojet kit. (It worked beautifully on my 11E after I added pods.)
            1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

            2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

            Comment

              #7
              Originally posted by Rob S. View Post
              You don't say why you didn't get the Dynojet kit. (It worked beautifully on my 11E after I added pods.)
              I emailed Dynojet and they did not have the kit for 1980 GS 550 L. I wish they had it after hearing everyone’s success with them

              Comment

                #8
                Dynojet has a kit for the 550M, which has the same engine and carbs. That will work.
                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

                Comment

                  #9
                  If it won't start with starting fluid, would that lean towards maybe a non carb problem? heck ought to run on starting fluid without carbs.
                  1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

                  Comment

                    #10
                    Originally posted by Nessism View Post
                    Dynojet has a kit for the 550M, which has the same engine and carbs. That will work.

                    what year is the 550M? I am not familiar with that bike. If it is the 1981 550M, I’m reading that it has 34mm Mikunis. My 1980 550L uses 32mm Mikunis — would that be an issue?

                    Comment

                      #11
                      Originally posted by rphillips View Post
                      If it won't start with starting fluid, would that lean towards maybe a non carb problem? heck ought to run on starting fluid without carbs.
                      To be fair, I never tried spraying starter fluid directly into the cylinders with the carbs off because I was afraid I’d damage them

                      Comment

                        #12
                        Point meant to be, no matter how you use starting fluid, thru the filter, remove filter and thru the air box, remove air box and straight into the carbs, remove carbs and straight into intakes, it should run on the fluid unless another problem.... I'm no expert, but just seems if won't run on fluid, may not be a carb problem.
                        1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

                        Comment

                          #13
                          Thanks I appreciate the feedback. Will give an update once I’ve cleaned up carbs

                          Comment

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