Blanked off port in Carb No2?

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  • Dec79
    #1

    Blanked off port in Carb No2?

    Hi guys, when rebuilding my carbs I've noticed that No2 (or No3 depending on which way you look) has a blank in one of the inside ports - the little brass ball.

    Can anyone shed any light on this please??

    Thanks in advance,
    Dec


    Tags: None
    • tom203
      Forum Guru
      Past Site Supporter
      • Aug 2010
      • 8925
      • Norway,Maine
      #2
      AS you sit on bike #3 is third from left- so ......
      1981 gs650L

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

        Comment

        • chuck hahn
          Forum LongTimer
          Past Site Supporter
          • May 2009
          • 25951
          • Norman, Oklahoma
          #3
          Hold it in front of you with the airbox side facing you. Look to see if the mixture screw on the side is facing to the left or right. The 1 and 2 mixture screws are on the left sides and 3 and 4 are on the right..like in this picture...
          Last edited by chuck hahn; 05-30-2012, 09:11 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

            • Dec79
              #4
              Thanks guys, I dont have the carbs to hand, but pretty sure it's number 2.

              Can anyone explain the blanking plug?

              Here are mine built up....

                Comment

                • chuck hahn
                  Forum LongTimer
                  Past Site Supporter
                  • May 2009
                  • 25951
                  • Norman, Oklahoma
                  #5
                  Note that 1 does not have a brass vent nipple and 2 does. Also the mixture screws face to the left.




                  Here are 3 and 4. Note the screws are to the right. Best way to tell 3 from 4 is to look at the big 10MM hole were the fuel tubes would go. Number 4 has one that is OPEN ON THE LEFT and CLOSED OFF ON THE RIGHT. Number 3 has both fuel tube holes open.

                  Last edited by chuck hahn; 05-30-2012, 09:22 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

                    • rustybronco
                      Forum LongTimer
                      Bard Award Winner
                      GSResource Superstar
                      Past Site Supporter
                      • Jul 2005
                      • 14961
                      • Marysville, Michigan
                      #6
                      It's used to close off the bowl vent so the same passage can be used as a vacuum port.

                      Also, your carbs are assembled in the wrong order.

                      The BB is located in crab#3
                      Last edited by rustybronco; 05-30-2012, 09:24 AM.
                      De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

                      http://www.thegsresources.com/_forum...35#post1625535

                        Comment

                        • chuck hahn
                          Forum LongTimer
                          Past Site Supporter
                          • May 2009
                          • 25951
                          • Norman, Oklahoma
                          #7
                          And yours are built up totally opposite of what they should be...look at my pics again.
                          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

                            • Dec79
                              #8
                              Originally posted by chuck hahn
                              And yours are built up totally opposite of what they should be...look at my pics again.
                              Whoa.... you're right, I totally screwed up there!!

                              I've got a pic before they were dissembled, and 1-4 are inverted. Luckily they're only mounted on the back plate at this stage, I have the choke lever etc ready to fit.

                              Cheers for your help!

                              Dec

                                Comment

                                • Dec79
                                  #9
                                  Originally posted by rustybronco
                                  It's used to close off the bowl vent so the same passage can be used as a vacuum port.

                                  Also, your carbs are assembled in the wrong order.

                                  The BB is located in crab#3
                                  Thanks mate

                                    Comment

                                    • rustybronco
                                      Forum LongTimer
                                      Bard Award Winner
                                      GSResource Superstar
                                      Past Site Supporter
                                      • Jul 2005
                                      • 14961
                                      • Marysville, Michigan
                                      #10
                                      Don't forget to put the carbs in the proper order...
                                      De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

                                      http://www.thegsresources.com/_forum...35#post1625535

                                        Comment

                                        • MisterCinders
                                          #11
                                          Originally posted by Dec79
                                          Whoa.... you're right, I totally screwed up there!!

                                          I've got a pic before they were dissembled, and 1-4 are inverted. Luckily they're only mounted on the back plate at this stage, I have the choke lever etc ready to fit.

                                          Cheers for your help!

                                          Dec
                                          Its not just 1 and 4 that are wrong. 2 and 3 are wrong in that pic as well. Make sure you double check that the carbs are in the right order. Each is different. If you mistakenly swap 1 and 2 or 3 and 4, the outside carb and cylinder will do nothing because it won't receive fuel. Ask me how I know this . . .

                                          Here is how you can identify the carbs every time.

                                          First, check the fuel ports. 2 and 3 have fuel ports that go all the way, and you can see straight through them. 1 and 4 only have one fuel path, so you cannot see through them.

                                          Second, now that you have paired 1 and 4 and 2 and 3, the next clue to arranging them is the air screws. Those face to the outside, so you can adjust them on the bike. As you look at the carb with the air intake facing you, the No. 1 and 2 carbs have air screws pointing left, the 3 and 4 carbs have air screws pointing right.

                                            Comment

                                            • MisterCinders
                                              #12
                                              Originally posted by Dec79
                                              Whoa.... you're right, I totally screwed up there!!

                                              I've got a pic before they were dissembled, and 1-4 are inverted. Luckily they're only mounted on the back plate at this stage, I have the choke lever etc ready to fit.

                                              Cheers for your help!

                                              Dec
                                              You'd be pulling them off that back plate anyway, based on that pic, even if they were in the correct order.

                                              Anyone else see why?

                                                Comment

                                                • chuck hahn
                                                  Forum LongTimer
                                                  Past Site Supporter
                                                  • May 2009
                                                  • 25951
                                                  • Norman, Oklahoma
                                                  #13
                                                  You mean other than the throttle linkage missing??? No choke rail or forks?? He did state that he had to put them on so i assume this was only a mock up run.
                                                  Last edited by chuck hahn; 05-30-2012, 11:35 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

                                                    • allojohn
                                                      Forum Sage
                                                      Past Site Supporter
                                                      Super Site Supporter
                                                      • Jan 2011
                                                      • 3515
                                                      • NoMo, MN
                                                      #14
                                                      Originally posted by MisterCinders
                                                      You'd be pulling them off that back plate anyway, based on that pic, even if they were in the correct order.

                                                      Anyone else see why?
                                                      Two of the bowl drains are facing the wrong way?
                                                      -Mal

                                                      "The only reason for time is so that everything doesn't happen at once." - B. Banzai
                                                      ___________

                                                      78 GS750E

                                                        Comment

                                                        • MisterCinders
                                                          #15
                                                          Originally posted by chuck hahn
                                                          You mean other than the throttle linkage missing??? No choke rail or forks?? He did state that he had to put them on so i assume this was only a mock up run.
                                                          Yep.

                                                          The choke rail and forks can go in on the rack, but not easily.

                                                          That throttle linkage, however, is impossible to install once the carbs are on the rack.

                                                          Ask me how I know . . .

                                                            Comment

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