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Carb OEM specs as per factory manuals

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    Originally posted by Eliseo Monteverde View Post
    Hello folks!

    I took this from my SUZUKI GS 650 G SERVICE MANUAL
    I hope this could help....

    GS 650 GLD (83)

    idle r/min 1100-+/-100r/min
    carb mik bs32ss (4 seprate carbs)
    id no 34390
    bore size 32 (1.26)
    float height 22.4.+/-1.0 (0.88 +/-0.04)
    fuel level 5.0+/-0.5 (0.20 +/-0.04)
    main jet #107.5
    main air jet 1.2
    jet needle 5D59-3rd
    needle jet X-2
    pilot jet #47.5
    throttle valve #135
    by pass 0.8, 0.8, 0.8
    pilot outlet 1.0
    valve seat 2.0
    starter jet #32.5
    pilot screw pre-set (2.5 turns back (mixture screw))
    pilot air jet #160
    throttle cable play 0.5-1.0 (0.02-0.04)
    choke cable play 0.5-1.0 (0.02-0.04)

    Just wanted to update this.. because it's very wrong for the 1983 650 GLD.

    GS 650 GLD (83)

    idle r/min 1100 -/+ 50 r/min
    carb - Mikuni bs32ss (4 separate carbs)
    id no 34300
    bore size 32 (1.26)
    float height 22.4.+/-1.0 (0.88 +/-0.04)
    fuel level 5.0 +/- 1.0 (0.20 +/-0.04)
    main jet #110
    main air jet 2.0
    jet needle 5C45
    needle jet Y-7
    pilot jet #42.5
    throttle valve #135
    by pass 0.8, 0.7, 0.8
    pilot outlet 0.7
    valve seat 2.0
    starter jet #45
    pilot screw pre-set (2.5 turns back (mixture screw))
    pilot air jet #160
    throttle cable play 0.5 - 1.0 (0.02-0.04)
    choke cable play 0.5 - 1.0 (0.02-0.04)

    Comment


      Sooo much thank you for this info! I was totally lost as to which '77 GS750 I have.

      Comment


        Yes..its goes by ENGINE number as youll see in the chart from post 42 of this thread.
        MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
        1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

        NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


        I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

        Comment


          Hi Everyone,

          I have an '82 GS650G. I diagnosed an air leak at the intake boots, so I replaced them. I have had a horrible time trying to reinstall the carbs. My service manual calls for ID 34200, but the carbs I have are ID 34300.

          I have read this thread and the 34300 are posted here as the right fit for the motorcycle. Is there any significant difference in size or position that would make it hard to install into new boots?

          Thanks,

          Jeff

          Comment


            Hi, I have a GS 550 from 1978 with VM22SS Carbs.
            4 in 1 Exhaust and open Velocity Stacks.
            The bikes is very rich with 95" Main Jets. Struggling and misfire to rev higher. Black Sparks
            Should i go for 80" ?
            Float level 24 mm
            Air Screw on top of carbs: 2` back
            Mixture Screw under the carb: 2`back
            Anyone an ide how to set the carbs up ?
            Thanks.
            GreetingsIMG_20180318_201812.jpg

            Comment


              OK, I'll give this one crack.
              What pilot jet do have in there?
              I believe stock main jet is 80, so 95 with stacks sounds about right.
              The fuel screw under the carb should be closer to 1 full turn out.
              Air screw is close.

              You might get a better response if you start a new thread.....
              -Mal

              "The only reason for time is so that everything doesn't happen at once." - B. Banzai
              ___________

              78 GS750E

              Comment


                Originally posted by allojohn View Post
                OK, I'll give this one crack.
                What pilot jet do have in there?
                I believe stock main jet is 80, so 95 with stacks sounds about right.
                The fuel screw under the carb should be closer to 1 full turn out.
                Air screw is close.

                You might get a better response if you start a new thread.....
                Thanks for the answer.

                Pilot jet is 15" original
                Main now 80" original Mikuni
                I newer buy aftermarked jets again ! They dont work at all.
                Will go for 95" Main Mikuni.

                Should the Air Screw on Top be fully closed ?

                Comment


                  Originally posted by Pfaffe1 View Post
                  Thanks for the answer.

                  Pilot jet is 15" original
                  Main now 80" original Mikuni
                  I newer buy aftermarked jets again ! They dont work at all.
                  Will go for 95" Main Mikuni.

                  Should the Air Screw on Top be fully closed ?
                  Air screw should about 2 full turns out.
                  Use the highest idle method - adjust the idle to about 1,250 rpm and adjust each air screw in half a turn then back it out as you listen to the engine for highest idle.
                  Then adjust the idle to 1,250 rpm and move to the next carb, repeat.

                  BTW, have you adjusted your valve shims lately? If the valve shims are not within spec you'll always have trouble adjusting the carbs.....
                  Then of course you will need to balance the carbs with a vacuum sync...
                  It's a continuing battle with these old machines.....
                  -Mal

                  "The only reason for time is so that everything doesn't happen at once." - B. Banzai
                  ___________

                  78 GS750E

                  Comment


                    Originally posted by allojohn View Post
                    Air screw should about 2 full turns out.
                    Use the highest idle method - adjust the idle to about 1,250 rpm and adjust each air screw in half a turn then back it out as you listen to the engine for highest idle.
                    Then adjust the idle to 1,250 rpm and move to the next carb, repeat.

                    BTW, have you adjusted your valve shims lately? If the valve shims are not within spec you'll always have trouble adjusting the carbs.....
                    Then of course you will need to balance the carbs with a vacuum sync...
                    It's a continuing battle with these old machines.....
                    Hi, bike is running nearly fine. 105# main, 15# pilot jet, needle midt pos. ( was on 4 th. ?), Mix screw down 2 turn out, air screw up 2 turn out, float 24 mm, new O-rings, Engine Valves shims correct.
                    I need new needles ( worn ) 5DL36

                    Thanks for help and answers
                    greetings
                    Bernd

                    Comment


                      Looking for the carb specs on a 81 gs1100 16 valve motor
                      Thanks.

                      Comment


                        Originally posted by Tugla View Post
                        Looking for the carb specs on a 81 gs1100 16 valve motorThanks.
                        Here you go.... How's the weather?http://members.dslextreme.com/users/...eight.html#A01
                        1981 gs650L

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

                        Comment


                          Thanks for the link.

                          Light snow today....warmed up a bit from the weekend. Think -25ish vs -32.....not bad lol

                          Comment


                            I have a 1977 gs750 that was my dads, I have recently did a tear down of the carbs and a did a complete rebuild, I would like to know if anyone has the factory settings for the needle valve, fuel/air, and how I need to sync the carbs. the bike has the stock airbox and exhaust.

                            Comment


                              jamuso, not to be too snippy about it but why not use the "Search This Thread" box? Putting '"GS750" into it gets me all kinds of 750 stuff.

                              also for a shop manual that has the info and much else goto BikeCliff's Website

                              Comment


                                Hi!

                                Does anyone have carburetor specs for a 1985 GS700ESF?

                                Thanks in advanced,
                                Andre

                                Comment

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