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Runs well but plugs are sooty black. Why? (GS1000 G)

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    #46
    Over flows are the nipples at the bowl bottoms. By chance, do you have the vents capped off? If so, uncap them. without the abilty to equalise fuel levels to the atmospheric pressure they will screw up and I have seen one such instance that this caused them to overflow out the throats. I uncapped the vents and magically it was a new bike.
    The vents are the nipples between 1 and 2 and 3 and 4.

    On VM carbs the nipple on carb 3 goes up to the petcock vacuum nipple. On CV carbs the nipple on the back of carb 2 is the petcock suction.
    Last edited by chuck hahn; 11-22-2014, 11:04 AM.
    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

      #47
      They are uncapped. Those bolts wont let any fuel through cause they are screwed in. They cant be the overflows.
      sigpic 1980 GS550E

      Comment

        #48
        Lets say the needle valves are not shutting. How do I fix that?
        sigpic 1980 GS550E

        Comment

          #49
          I stand corrected..your right..CV carbs dont have overflows on the bowls. Its been a while and I checked the tutorial here to refresh the memory.

          So the vents arent capped or plugged, your seats and needles are new so there shouldnt be an issue there. Float hts are set but they still are leaking out the carb throats. I cant think of anything thats out of sorts other than the floatb hts are still just a little too low to positively shut off the fuel at the float needles.

          Is the leaking out all the carbs or just 1 or 2?? To see youd have to remove the airbox and dry the throats to see what ones get wet again.

          Honestly float hts is the only thing making sense here to me.

          Page Not Found
          http://www.mtsac.edu/~cliff/storage/gs/mc_maint/GS_CV_Carb_Cleaning_Series.pdf
          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

            #50
            New rings on the float seats to seal them to the carb bodies??? If they dont seal then fuel can leak past the outer edges of the seat themselves.. bypassing the float needles ability to shut off fuel. Float hts may be fine as well as the needles working fine.....just another thought.
            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

              #51
              On the question of if they arent shutting. The most common thing that makes the needles hang up is the floats dropping to far into the bowls when the bowls are first dry and not floating in gas.

              If youll look at the brass bridge thing the hinge is made out of and the floats attach to youll notice theres a little tab thats bent at a 90 degree and that tab lines up with one of the float posts.

              This tab is a stop that will let the float drop into the bowls just so far. If the float drops too far, the needle drops past that certain point that will allow it to go back up and it jams up the hinge...follow me?? Also with the floats installed you should be able to visually SEE the tab..if you dont youve installed the floats upside down.

              "USUALLY" noone ever messes with the tabs and they are still at whatever the factory set them at and theres never a problem...BUT you cant ever tell what the last guy fiddled with or not.
              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

                #52
                After re-reading this entire thread, I noticed that no where is it mentioned that the O-rings, part number 50 here: http://www.partsoutlaw.com/oemparts/...9e1/carburetor have been replaced yet.
                Until they are, these carbs will always leak fuel past the float needles/seats. Every set of CV carbs that I have repaired either had these torn, damaged, dried up and loose, etc. This is the NUMBER ONE reason that these carbs leak fuel.
                With your postal problems, hoping that your parts will get to you soon so that you can replace these leakers. Be sure to lubricate them before installation. Silicon spray or something similar really helps as they will go in TIGHT.

                Comment

                  #53
                  I had already asked that question of him a few posts back............
                  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

                    #54
                    I did receive an o ring in the repair kit but dont know what to do with it. The valve already had an o ring on it and it went in tight. Package had no real description for the o ring or where it must go. image.jpgThe o ring next to the clip...?
                    sigpic 1980 GS550E

                    Comment

                      #55
                      Yes, that is the one that ALWAYS leaks if it not replaced. You can waste time playing with the needle/seat or float heights until the cows come home but until those are replaced you are shooting yourself in the foot. IME

                      Comment

                        #56
                        Okay great but where do they go?
                        sigpic 1980 GS550E

                        Comment

                          #57
                          I posted this link earlier but you must not have seen it. And just cause they go in tight doesnt mean they sealed..especially the old ones. They are a 1 use deal. Lubrication helps the slide ion and it ALSO keeps them from snagging and ripping while inserting the seats. They may go in but they may tear in the process too.

                          Page Not Found
                          http://www.mtsac.edu/~cliff/storage/gs/mc_maint/GS_CV_Carb_Cleaning_Series.pdf
                          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

                            #58
                            And based on your last question it seems clear you HAVENT torn them down and did a proper cleaning, so I suggest you start from step one, get some Berrymans and do the full 24 HR soaking of the bodies and do them right. And you have effectively wasted your money on those aftermarket kits. Once you read the tutorial youll soon realise that all you needed was the dip, some time, and the Cv (BS CARB) kits from our member robertbarr at his website...........

                            index
                            http://cycleorings.com/
                            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

                              #59
                              Originally posted by Vloukole View Post
                              Okay great but where do they go?
                              I was going to say that if you cannot figure that out by looking at the parts fiche, get someone else to do it but, I will allow you to THINK instead.

                              Comment

                                #60
                                Is it the o ring around the valve?
                                sigpic 1980 GS550E

                                Comment

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