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    #1

    polishing carb internals

    i know the basic principles of fuel/air atomisation requiring a slightly rough surface to help "mix it up" but i was wondering if any body has gone to the trouble of polishing the actual inlet tracts in their carbs, and may be the slides?
    if so did this help or hinder the carb settings?
    just curious
    1978 GS1085.

    Just remember, an opinion without 3.14 is just an onion!
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    #2
    Originally posted by Agemax View Post
    i know the basic principles of fuel/air atomisation requiring a slightly rough surface to help "mix it up" but i was wondering if any body has gone to the trouble of polishing the actual inlet tracts in their carbs, and may be the slides?
    if so did this help or hinder the carb settings?
    just curious
    Polishing there is probably detrimental to good atomisation, which needs to start as early as possible in the induction tract, inboard of the needle jet. You may gain some flow advantage by reshaping the carb inlet, but you need to know where to add/remove material. Without a flow testing jig, you could go backwards too.
    The road to hell is paved with good intentions......................................

    GS 850GN JE 894 10.5-1 pistons, Barnett Clutch, C-W 4-1, B-B MPD Ignition, Progressive suspension, Sport Demons. Sold
    GS 850GT JE 1023 11-1 pistons. Sold
    GS1150ES3 stock, V&H 4-1. Sold
    GS1100GD, future resto project. Sold

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    Comment

      #3
      I could see a benefit from polishing the slides, so long as you made damn sure no polishing compound or residue stayed behind before putting them back in. Polishing them to make certain they were smooth could help ensure they glide up and down in the carb bodies.

      Comment

        #4
        thought as much, i just like polishing lol. im like a magpie, i like shiny things
        1978 GS1085.

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

        Comment

          #5
          Polishing things such as the slides also removes materials and changes the diameters of them...leave well enough alone has its places...if you know what I mean.
          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

            #6
            what about a polished bellmouth compared to a spun satin finish aluminium?
            1978 GS1085.

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

            Comment

              #7
              Originally posted by Agemax View Post
              thought as much, i just like polishing lol. im like a magpie, i like shiny things
              If that's so then I have much parts you can polish.
              I hate it!

              No way I would touch the inside of a carb.
              I agree with Chuck, leave well nuff alone!
              sigpic

              82 GS850
              78 GS1000
              04 HD Fatboy

              ...............................____
              .................________-|___\____
              ..;.;;.:;:;.,;.|__(O)___|____/_(O)|

              Comment

                #8
                Originally posted by Octain View Post
                If that's so then I have much parts you can polish.
                I hate it!

                No way I would touch the inside of a carb.
                I agree with Chuck, leave well nuff alone!
                bring em over mate, i love it. so much satisfaction from going from a scabby old cover to a piece of mirror perfection
                1978 GS1085.

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

                Comment

                  #9
                  A polished bellmouth is that way for a reason. It allows the air to flow as easily and quickly as possible thru it. Where its clamped to the carb is exactly where the turbulance needs to start..at the carb and not halfway down the intake pipe.
                  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

                    #10
                    Originally posted by chuck hahn View Post
                    A polished bellmouth is that way for a reason. It allows the air to flow as easily and quickly as possible thru it. Where its clamped to the carb is exactly where the turbulance needs to start..at the carb and not halfway down the intake pipe.
                    my bellmouths are spun satin aluminium so would they be better off polished?
                    1978 GS1085.

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

                    Comment

                      #11
                      Post pics of the critters..just how smooth is the interior surfaces??
                      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

                        #12
                        not a brilliant pic, they are not as shiny as they look. they have had a wiz over with some autosol just to make sure they are clean.

                        maybe a better pic
                        Last edited by Agemax; 05-30-2012, 06:54 PM. Reason: new pic added
                        1978 GS1085.

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

                        Comment

                          #13
                          Not seeing a picture???
                          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

                            #14
                            there is 2 pics on now, they show up on my thread?
                            1978 GS1085.

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

                            Comment

                              #15
                              2 boxes with red Xs is all i see??
                              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

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