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Idles perfect at 1100rpm but.....

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    #1

    Idles perfect at 1100rpm but.....

    (1980 GS 850L) re-built and cleaned cards (dipped), sealed the air box, new boots from air box to carbs

    ....when I twist the throttle is sputters at about 2500-3500. I can keep twisting past the sputter every once in a while and it will get up to around 5000rpm and sounds clean but then when I let off it will idle at 1100 then sputter if I go up again. I have read tons of threads on this forum but nothing specific like this. It idled high earlier but I fixed a hung up spring in carb 1 and sealed my air box like suggested in another thread, now it idles great. Any ideas about the sputtering?

    Thanks in advance for the advice.

    mark
    Tags: None
    #2
    Sounds like you're a touch rich on the idle air adjustment screws if it's stumbling just off idle.

    Try turning each of them in about an eighth of a turn, it doesn't take much to effect a change.
    Larry D
    1980 GS450S
    1981 GS450S
    2003 Heritage Softtail

    Comment

      #3
      Originally posted by Larry D View Post
      Sounds like you're a touch rich on the idle air adjustment screws if it's stumbling just off idle.

      Try turning each of them in about an eighth of a turn, it doesn't take much to effect a change.
      Will do thanks...will let you know how it turns out.

      Comment

        #4
        What happens if you "blip" the throttle ? Does it settle to idle nicely or does it drop lower than 1100 rpm and then catch up ? If it does, you're a bit rich. If it takes awhile for it to settle down to an idle or "hangs", then you're a bit lean. A good carb sync may help too.

        I used to carry a small jeweler's screwdriver and adjust them to get the best off idle results. It took about 3 or 4 rides until I got it sorted.
        Larry D
        1980 GS450S
        1981 GS450S
        2003 Heritage Softtail

        Comment

          #5
          Originally posted by Larry D View Post
          What happens if you "blip" the throttle ? Does it settle to idle nicely or does it drop lower than 1100 rpm and then catch up ? If it does, you're a bit rich. If it takes awhile for it to settle down to an idle or "hangs", then you're a bit lean. A good carb sync may help too.

          I used to carry a small jeweler's screwdriver and adjust them to get the best off idle results. It took about 3 or 4 rides until I got it sorted.
          It settles pretty quickly but it is sluggish as I "blip" it.

          Plus, I have been looking but cannot find,,,,which one is the idle air adjustment screw? Never mind,,,found them.
          Last edited by Guest; 04-01-2011, 12:59 PM.

          Comment

            #6
            Top front

            You did pull that out when you dipped your carbs?
            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

            Comment

              #7
              ok, it seems to be getting better as I turn the screws clockwise but I am getting some popping (backfire) as I let off the throttle.

              Comment

                #8
                Originally posted by Mark Stevens View Post
                ok, it seems to be getting better as I turn the screws clockwise but I am getting some popping (backfire) as I let off the throttle.
                You went a bit to far I'm thinking.......THIS is really what you want to do, you need a good ear though.

                highest_rpm_plug_chop
                http://members.dslextreme.com/users/bikecliff/images/highest_rpm_plug_chop.html
                Larry D
                1980 GS450S
                1981 GS450S
                2003 Heritage Softtail

                Comment

                  #9
                  Originally posted by Big T View Post
                  Top front

                  You did pull that out when you dipped your carbs?
                  I hope Mark Stevens answers this question!
                  1981 gs650L

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

                  Comment

                    #10
                    Originally posted by tom203 View Post
                    I hope Mark Stevens answers this question!
                    Yes they were pulled. I just forget what particular things are sometimes and have to look them up again.

                    Comment

                      #11
                      Greetings and Salutations!!

                      Hi Mr. Mark Stevens,

                      Here's the scoop. I'm going to share some GS lovin'.

                      I just stopped by to welcome you to the forum in my own, special way.

                      If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

                      Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Rebuild Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. Now let me roll out the welcome mat for you...



                      Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

                      Thanks for joining us. Keep us informed.

                      Thank you for your indulgence,

                      BassCliff

                      Comment

                        #12
                        Originally posted by BassCliff View Post
                        Hi Mr. Mark Stevens,

                        Here's the scoop. I'm going to share some GS lovin'.

                        I just stopped by to welcome you to the forum in my own, special way.

                        If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

                        Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Rebuild Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. Now let me roll out the welcome mat for you...



                        Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

                        Thanks for joining us. Keep us informed.

                        Thank you for your indulgence,

                        BassCliff
                        Hey BassCliff,

                        thanks for the welcome and I have used this site and your website extensively during my re-build....thanks

                        Comment

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