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    Air Screw/Idle Adjustment

    I just got my 82 GS 650 up and running and it runs fine as long as I give it some gas.

    I cannot seem to get the bike to idle. The carbs were just rebuilt and haven't been retuned. I have tried to adjust the idle using the adjustment screw and as low as I can get it is roughly 2k revs. Could the air screws being out of adjustment cause this?

    Any help would be greatly appreciated!

    #2
    Originally posted by rcklobster View Post
    I just got my 82 GS 650 up and running and it runs fine as long as I give it some gas.

    I cannot seem to get the bike to idle. The carbs were just rebuilt and haven't been retuned. I have tried to adjust the idle using the adjustment screw and as low as I can get it is roughly 2k revs. Could the air screws being out of adjustment cause this?

    Any help would be greatly appreciated!
    If they are way off, maybe. Start them at 3 full turns out to start with and go from there. It should idle fine at that setting. Could it also be that your pilot jets are still not cleaned out enough yet?
    Current Bikes:
    2001 Yamaha FZ1 (bought same one back)

    Comment


      #3
      If you had the carbs completely apart (including the rack), there is also the chance that your sync is off.

      Ddaniels is correct, though, start by adjusting your IDLE MIXTURE ADJUSTMENT SCREWS (they are not "air" screws) to three full turns out from lightly seated. This will richen the mixture probably a bit more than necessary, but will only act like a "choke" and enable cold starting so you can fine-tune them.

      To fine-tune the mixture screws, warm up the engine, then slowly turn each mixture screw in until you hear the engine speed drop a bit. Back the screw out about 1/8 turn, go to the next carb. When you have done all the carbs, come back, do it again, just to make sure.

      When you are happy with the results, record your settings for future reference.

      .
      Last edited by Steve; 08-14-2011, 02:54 PM.
      sigpic
      mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
      hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
      #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
      #2 son: 1980 GS1000G
      Family Portrait
      Siblings and Spouses
      Mom's first ride
      Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
      (Click on my username in the upper-left corner for e-mail info.)

      Comment


        #4
        I recently rebuilt the carbs for my 81 GS550L, and even after making the initial bench settings, you still need some test equipment to adjust them properly. One or more of your carbs are leading the way and since you are above the primary idle circuit, no adjustment of the airmix needles will help even out the air being pulled through the carb venturis. The adjustment for this would be the carb linkages after the airmix screws are set. As mentioned, 3 turns out on the mixture screw is a perfect starting place. I ended up at 3.5. Plenty of tech stuff on this sight is available to help you out. Borrow it or make a homeade carbsync nanometer. Rember, You'll never get it perfect.... but close enough is OK here.

        Comment


          #5
          +1 on the possiblity of the sync being out of...err...sync. Made a huge difference on mine after sync'ing the carbs. You will need adapters to sync them up. They screw into the little ports on the sides of the intake boots that screw into the head that are now occupied by screws.
          Current Bikes:
          2001 Yamaha FZ1 (bought same one back)

          Comment


            #6
            Did you replace the intake o-rings?
            Adjust the valves?
            1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
            1985 GS1150ES stock with 85 Red E bodywork.

            Comment


              #7
              Originally posted by Kurtgun11 View Post
              ... and since you are above the primary idle circuit, no adjustment of the airmix needles will help even out the air being pulled through the carb venturis. ...
              Not sure just how to tell you this, but the "airmix needles" are NOT for synchronizing the carbs.

              And, there are no "airmix needles" on this bike, they are "idle mixture adjustment screws".
              They are there to adjust the MIXTURE, not the synchronization.



              Originally posted by Kurtgun11
              ... Borrow it or make a homeade carbsync nanometer.
              Save yourself some time, money and aggravation. Buy one.



              Originally posted by Kurtgun11
              Rember, You'll never get it perfect.... but close enough is OK here.
              No reason WHY you can't get it "perfect".

              It all depends on just how well you want your bike to run.

              .
              sigpic
              mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
              hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
              #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
              #2 son: 1980 GS1000G
              Family Portrait
              Siblings and Spouses
              Mom's first ride
              Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
              (Click on my username in the upper-left corner for e-mail info.)

              Comment


                #8
                I know this is an old thread, but hopefully I can help save someone the hours of research I did to find the answer. The on-line schematics, as well as parts suppliers, make no reference to the mix screws. My. GS300l had set for 18 years, purrs like a kitten right now. The adjusters are on top of the carburetors next to the head. I had to drill mine out to access them . I have attached(hopefully) an image I had found . Different bike than mine, but should clear things up.
                Attached Files

                Comment


                  #9
                  If you had to drill out the covers, it's obvious that your carbs have not been cleaned (properly) since they were assembled in Japan, 30+ years ago. Yes, that is where most of the mixture screws are. Some are pointing to the sides, rather than up, but are in the same general location.

                  .
                  sigpic
                  mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                  hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                  #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                  #2 son: 1980 GS1000G
                  Family Portrait
                  Siblings and Spouses
                  Mom's first ride
                  Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                  (Click on my username in the upper-left corner for e-mail info.)

                  Comment


                    #10
                    N

                    As I stated, my bike was setting for 18 years. I should have stated that the bike set for 18 years before I bought it at a yard sale for $100.00. I'm a newbie to motorcycle mechanics . I had spent hours looking for info on my GS300l , and from what I can tell on the Internet, I am not alone.
                    One site I went to thru a search was a thread on a pay site here the "expert" said that the mix screws didn't exist and the air was controlled thrum the jets.
                    I had a Honda back in Highschool, over 35 years ago. So all I was doing was showing other newbies who stumble on these "barn finds" where the air mixes are on a GS. Having spent the time researching and finding nothing, I hope it helps other newbies.

                    Comment


                      #11
                      All the information you could possibly need is here.
                      http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                      Life is too short to ride an L.

                      Comment


                        #12
                        And it's FREE.

                        .
                        sigpic
                        mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                        hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                        #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                        #2 son: 1980 GS1000G
                        Family Portrait
                        Siblings and Spouses
                        Mom's first ride
                        Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                        (Click on my username in the upper-left corner for e-mail info.)

                        Comment

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