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    Newbie needing carb help

    This may be a dumb question but I have a 77 GS750 that I've been tuning up and teaching myself how to work on bikes with so I've had a lot of dumb questions lately.
    Just recently I noticed a very slow gas leak coming from one one of the carbs. I took them off again to clean them out and replace gaskets and o-rings and noticed the leak was coming out of this jet (pic below) on all of the carbs. I got ahead of myself and took one of them out and later found in the service manual to leave them be as they are set in the factory for each individual carb. Now I'm wondering what jet this is and how to adjust them myself. As I said I've been trying to teach myself all of this and am usually able to find answers on this forum (which has been a huge help, thanks guys!) but since this is just "a jet I shouldn't touch" I haven't been able to find any info on it. So any answers or resources would be greatly appreciated. Thanks.

    IMG_1075-1.JPG

    #2
    The only way gas can come out of the fuel screw is a bad o-ring.
    Check and make sure the fuel screw tip is not broken off in the throat of the carb.
    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.

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      #3
      Go here http://members.dslextreme.com/users/bikecliff/ and go to this thread http://members.dslextreme.com/users/...rb_rebuild.pdf it should help.

      Comment


        #4
        Well, the bad news is that, you didn't really clean your carbs.

        Order some O rings from cycleorings.com, take those pilot fuel screws out and properly clean the carb bodies as shown in the tutorial above

        Disregard what it says about the factory preset.. You may find marks that indicate the preset position, but about 3//4 turn out from lightly seated is about right
        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


          #5
          Originally posted by Big T View Post
          Order some O rings from cycleorings.com, ...
          Yes, do this, but be aware that the ENTIRE staff of cycleorings.com is on a motorcycle vacation until August 9.

          .
          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.)

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            #6
            Thanks SVSooke, that's exactly what I was looking for. Must have missed that on the Basscliff site. I never actually got around to cleaning them last night, just took the pilot fuel screw out to inspect it and then noticed the warning in the manual. I have carb rebuild kits that have all new jets, o-rings, and gaskets so I'll just use those for now. But thanks for the cycleorings site. That will definitely come in handy later.

            I'll start out with all of the pilot fuel screws out 3/4 of a turn and see how that goes. Thanks guys!

            Comment


              #7
              Originally posted by drewaugie View Post
              Thanks SVSooke, that's exactly what I was looking for. Must have missed that on the Basscliff site. I never actually got around to cleaning them last night, just took the pilot fuel screw out to inspect it and then noticed the warning in the manual. I have carb rebuild kits that have all new jets, o-rings, and gaskets so I'll just use those for now. But thanks for the cycleorings site. That will definitely come in handy later.

              I'll start out with all of the pilot fuel screws out 3/4 of a turn and see how that goes. Thanks guys!
              The pilot fuel screws should be set to 2 1/2 COMPLETE turns out from seated. The 3/4 information is incorrect for a CV carb.

              Error: This is for CV carbs and yours are VM.
              Last edited by JTGS850GL; 07-31-2016, 02:28 PM.
              http://img633.imageshack.us/img633/811/douMvs.jpg
              1980 GS1000GT (Daily rider with a 1983 1100G engine)
              1998 Honda ST1100 (Daily long distance rider)
              1982 GS850GLZ (Daily rider when the weather is crap)

              Darn, with so many daily riders it's hard to decide which one to jump on next.;)

              JTGS850GL aka Julius

              GS Resource Greetings

              Comment


                #8
                Originally posted by JTGS850GL View Post
                The pilot fuel screws should be set to 2 1/2 COMPLETE turns out from seated. The 3/4 information is incorrect for a CV carb.
                But isn't his 77 GS 750 of the VM series. If so, then the 3/4 out would be correct.
                Larry

                '79 GS 1000E
                '93 Honda ST 1100 SOLD-- now residing in Arizona.
                '18 Triumph Tiger 800 (gone too soon)
                '19 Triumph Tiger 800 Christmas 2018 to me from me.
                '01 BMW R1100RL project purchased from a friend, now for sale.

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                  #9
                  Originally posted by alke46 View Post
                  But isn't his 77 GS 750 of the VM series. If so, then the 3/4 out would be correct.
                  Absolutely correct. I was thinking CV for some reason. My mistake. Sorry for the confusion.
                  http://img633.imageshack.us/img633/811/douMvs.jpg
                  1980 GS1000GT (Daily rider with a 1983 1100G engine)
                  1998 Honda ST1100 (Daily long distance rider)
                  1982 GS850GLZ (Daily rider when the weather is crap)

                  Darn, with so many daily riders it's hard to decide which one to jump on next.;)

                  JTGS850GL aka Julius

                  GS Resource Greetings

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