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Pops n farts under 7k rpm

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    #1

    Pops n farts under 7k rpm

    History
    1979 gs750
    ported head
    .040 over bore with weisco pistons
    pods (oval)
    4 into 2 short pipes just baffled
    went up 3 jet sizes
    clips one from the top?
    idle air at 1 3/4 turns

    followed carb recommendations from here for set up

    so now she starts first kick
    runs great up to about 2000 rpm
    pops and farts to 7000rpm
    then goes like a bat outa hell and tries to rip your arms off

    what am I doing wrong

    thanks
    Tags: None
    #2
    Try moving the needles the other way.
    Current:
    Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha :eek:)

    Past:
    VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
    And a bunch of other crap Yamahas....

    Comment

      #3
      Yep, put your clips one from the BOTTOM.

      Might also try the air screws at about 1 1/2 turns.
      If you're not living on the edge, you're taking up too much space.

      Comment

        #4
        Bigger main jet needed, 117.5 and try the clip at position 4.

        Read this.
        -Mal

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

        78 GS750E

        Comment

          #5
          Originally posted by Rustyhooker View Post
          ...then goes like a bat outa hell and tries to rip your arms off
          Best quote ever!
          Jordan

          1977 Suzuki GS750 (My first bike)
          2000 Kawasaki ZRX1100
          1973 BMW R75/5

          Comment

            #6
            Pops, farts, Rustyhooker, aw man there is toooooooo much material there..............................must resist.................
            :cool:GSRick
            No God, no peace. Know God, know peace.

            Eric Bang RIP 9/5/2018
            Have some bikes ready for us when we meet up.

            Comment

              #7
              Thanks guys. I'll try it and let you know

              Comment

                #8
                image.jpgJust so you know what I'm working with. Thanks again

                Comment

                  #9
                  If it goes well after 7K then I would say the main jet is fine.

                  Needle height adjustments should do it.

                  And of course, you have done a full strip of the carbs with new O rings and carb rubbers? Haven't you?
                  Richard
                  sigpic
                  GS1150 EF bought Jun 2015
                  GS1150 ES bought Mar 2014: ES Makeover Thread AND blog: Go to the Blog
                  GS1100 G (2) bought Aug 2013: Road Runner Project Thread AND blog: Go to the Blog
                  GS1100 G (1) Dad bought new 1985 (in rebuild) see: Dad's GS1100 G Rebuild AND blog: Go to the Blog
                  Previously owned: Suzuki GS750 EF (Canada), Suzuki GS750 (UK)(Avatar circa 1977), Yamaha XT500, Suzuki T500, Honda XL125, Garelli 50
                  Join the United Kingdom (UK) Suzuki GS Facebook Group here

                  Comment

                    #10
                    O so the clips were at second from the bottom so I moved them all the way down. Checked my plugs and looks like I'm running lean. Whitish tips and all. So next is a ride and see what happens. The screws on the bottom of the carb were taken out for the cleaning etc. Any recommendations as to where they should be? Thanks again

                    Comment

                      #11
                      Originally posted by Rustyhooker View Post
                      O so the clips were at second from the bottom so I moved them all the way down. Checked my plugs and looks like I'm running lean. Whitish tips and all. So next is a ride and see what happens. The screws on the bottom of the carb were taken out for the cleaning etc. Any recommendations as to where they should be? Thanks again
                      The screws on the bottom are the pilot jets. One full turn out should be fine.
                      -Mal

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

                      78 GS750E

                      Comment

                        #12
                        Originally posted by Rustyhooker View Post
                        O so the clips were at second from the bottom so I moved them all the way down. Checked my plugs and looks like I'm running lean. Whitish tips and all. So next is a ride and see what happens. The screws on the bottom of the carb were taken out for the cleaning etc. Any recommendations as to where they should be? Thanks again
                        Finally put it back together and took er out fer a rip. Smoother transitions fro 3-7k but still poppy and farty at 3-4K Pipes to short and free flowing? Any help would be great. Thanks

                        Comment

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