carburetor & petcock conversion

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  • Charley Davidson
    • Jan 2026

    #1

    carburetor & petcock conversion

    Is anybody changed their gas tank petcock carburetors to gravity feed type?
    If yes what did you go with? I'm thinking about trying to find an old 550 or 750 4 cylinder carburetors
  • Agemax
    Forum Guru
    • Apr 2008
    • 8371
    • plymouth uk

    #2
    you just need to block off the vacuum port on the carbs, then you can use any petcock you like. no need to change carbs.
    1978 GS1085.

    Just remember, an opinion without 3.14 is just an onion!

    Comment

    • Charley Davidson

      #3
      Not exactly true the needles in these carburetors won't stop the fuel flow

      Comment

      • tkent02
        Forum LongTimer
        Past Site Supporter
        • Jan 2006
        • 35571
        • Near South Park

        #4
        What he said had nothing to do with needles.
        http://img.photobucket.com/albums/v5...tatesMap-1.jpg

        Life is too short to ride an L.

        Comment

        • Guest

          #5
          If your needles don't stop flow replace them. You already have a gravity feed fuel tap , it just uses vacuum to open and close it so that it does not flood past the needles in the carbs while sitting. Even on the old bikes you had to turn the fuel on and off manually or you would have the same problems. All that the vacuum fuel tap does is make it easier for you , as in you don't have to remember to turn the fuel off.

          Comment

          • koolaid_kid

            #6
            Originally posted by Charley Davidson
            Not exactly true the needles in these carburetors won't stop the fuel flow
            Actually, they will if properly maintained and cleaned. I have left mine on PRI for 24 hours or more with no leaking.
            Not what you want to do, but proof that they do stop the flow if properly maintained.

            Comment

            • Steve
              GS Whisperer
              • Jun 2005
              • 35924
              • southwest oHIo

              #7
              Originally posted by Charley Davidson
              Is anybody changed their gas tank petcock carburetors to gravity feed type?
              My STOCK petcock is a "gravity feed type".

              Originally posted by Charley Davidson
              If yes what did you go with? I'm thinking about trying to find an old 550 or 750 4 cylinder carburetors
              Not sure what you are trying to accompllish here.

              Can you please provide some more details?

              .
              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

              • Charley Davidson

                #8
                Originally posted by Steve
                My STOCK petcock is a "gravity feed type".


                Not sure what you are trying to accompllish here.

                Can you please provide some more details?

                .
                I don't like the carb setup on these things, I like the old fashioned carbs that have always been dependable. I have had nothing but trouble out of both of these bikes and would rather have systems I'm familiar with. I'd actually like to get rid of both of these pos's & get a CB anything.

                Comment

                • tkent02
                  Forum LongTimer
                  Past Site Supporter
                  • Jan 2006
                  • 35571
                  • Near South Park

                  #9
                  Cause CBs are way better at pulling wheelies and ****ing with people in SUVs.
                  http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                  Life is too short to ride an L.

                  Comment

                  • Steve
                    GS Whisperer
                    • Jun 2005
                    • 35924
                    • southwest oHIo

                    #10
                    Originally posted by Charley Davidson
                    I don't like the carb setup on these things, I like the old fashioned carbs that have always been dependable.
                    Really don't know how to tell you this, but ... we have "old fashioned carbs" on our bikes and they are dependable.


                    Originally posted by Charley Davidson
                    I'd actually like to get rid of both of these pos's & get a CB anything.
                    Just let us know how much you want and where to pick them up.

                    .
                    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

                    • Charley Davidson

                      #11
                      I really don't see the attraction to these bikes, I just seen a really nice all original GS550l about same year as mine listed on CL for $2500 it sold but not sure for actual selling price. A Honda of that quality would go for 10 grand.

                      Comment

                      • tkent02
                        Forum LongTimer
                        Past Site Supporter
                        • Jan 2006
                        • 35571
                        • Near South Park

                        #12
                        Go get a honda. Bu Bye.
                        http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                        Life is too short to ride an L.

                        Comment

                        • Charley Davidson

                          #13
                          Originally posted by tkent02
                          Go get a honda. Bu Bye.
                          When I get rid of these & get a Honda I will go BU Bye troll

                          Comment

                          • tkent02
                            Forum LongTimer
                            Past Site Supporter
                            • Jan 2006
                            • 35571
                            • Near South Park

                            #14
                            You already went Bu Bye.
                            http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                            Life is too short to ride an L.

                            Comment

                            • JTGS850GL
                              Forum Guru
                              Past Site Supporter
                              • Aug 2013
                              • 9735
                              • GA

                              #15
                              Pretty much been a troll since you arrived too. Do yourself a favor and sell those poor GS's to someone who cares about them and buy an over priced Honda. Everyone will then be HAPPY!
                              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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