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79 Gs750e jetting

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    79 Gs750e jetting

    Hi I have a 79 Gs750e
    I have fitted a marving 4 into 1 exhaust
    it has standard jets 100 mains and 15 pilot jet
    its running lean ,
    and exhaust yellowing
    should I go up 2 or 3 on mains and 1 on pilot
    thanks rob

    #2
    What are you using for air filter?
    1981 gs650L

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

    Comment


      #3
      What are the needle, air screw and fuel screw settings?
      There's a lot more to jetting than changing the main jet
      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


        #4
        100 mains 15 pilot
        fuel screw 7/8
        air screw 1 1/4
        needle not sure

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          #5
          Standard air box

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            #6
            Originally posted by Gs750rob View Post
            Hi I have a 79 Gs750e
            I have fitted a marving 4 into 1 exhaust
            it has standard jets 100 mains and 15 pilot jet
            its running lean ,
            rob
            Just so I’m on the same page, what is the clue that it is lean?
            And which circuit(s) are lean? (Idle, off idle, cruise, load, WOT?
            Jim, in Central New York State.

            1980 GS750E (bought used June,1983)
            1968 CB350 Super Sport (bought new Oct,1968)
            1962 CA77 305 Dream (bought used Feb,1963)

            Comment


              #7
              What do your spark plugs look like?
              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


                #8
                Running hot and new exhaust headers gone yellow/ blue
                no air leaks
                new exhaust gaskets
                new genuine air box rubbers and inlet rubbers

                Comment

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