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    #1

    Throttle won't close all the way

    This is my first time tearing down the carbs, but I noticed this immediately after I got the carbs off of the head. Is that as far down as the throttle valves go, or are they supposed to go all the way down? This is a 79 GS850 that has been sitting in a backyard under tarp for four years.

    The throttle shaft was really snappy when I opened it manually. The actual throttle mechanism that controls the cables seems to be completely frozen but that's a different issue I'll address later. I can't even manually push the throttle valves down to the correct closed position with the cable holder on the shaft. I unscrewed the two throttle cable adjuster screw so that they would have full freedom of movement opening and closing but still nothing.

    I'm going ahead and break the carbs down, but should the throttle not fully close after cleaning and reassembling them, what should I do?

    Last edited by Guest; 09-27-2013, 11:55 AM.
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    #2
    look to be about the same as mine.....



    .

    Comment

      #3
      Just making sure since your carbs are different, those are the bowls on the bottom, right?

      I thought i saw somewhere (read: imagined) that the throttle valves close completely but if how they're supposed to be then I'm happy I'm on the right track.

      Thanks!

      Comment

        #4
        yup bowls are on the bottom....

        you should be good to go....

        clean them up really well get new O-rings and you will be flying in no time....

        Have you been here

        http://members.dslextreme.com/users/bikecliff/


        it will tell you all you need to know, including the proper way to strip, clean and put your carbs back together....

        part way down the page on the right hand side....

        .

        Comment

          #5
          Originally posted by GateKeeper View Post
          look to be about the same as mine.....



          .
          Not the same at all, those are CV carbs, they operate completely differently.
          On the VM carbs that is the actual throttle, the slides need to go down all the way but a tiny sliver at the bottom.
          There are several adjustments, take it apart and grok it until you figure them out.
          http://img.photobucket.com/albums/v5...tatesMap-1.jpg

          Life is too short to ride an L.

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            #6
            Oh yeah. between bikecliffs site (thanks bikecliff!) and the workshop manual, I'm feeling pretty confident. I've already got them all taken apart, just waiting for the o-rings and gaskets to put them back together.

            Comment

              #7
              Originally posted by tkent02 View Post
              Not the same at all, those are CV carbs, they operate completely differently.
              On the VM carbs that is the actual throttle, the slides need to go down all the way but a tiny sliver at the bottom.
              There are several adjustments, take it apart and grok it until you figure them out.
              I did not mean that the carbs are the same, but that the slides are down about the same in mine as they are in his

              as in this pic



              and

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                #8
                That's about as far as they close on the air box side. They close tighter on the intake boot side.

                Comment

                  #9
                  Originally posted by giganticflying View Post
                  Oh yeah. between bikecliffs site (thanks bikecliff!) and the workshop manual, I'm feeling pretty confident. I've already got them all taken apart, just waiting for the o-rings and gaskets to put them back together.
                  So, a carb body is in your can of Berryman's?
                  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

                    #10
                    No, they're just sitting there, un-berryman'd, mostly disassembled, waiting patiently, unlike me. I can't wait to get this thing up back together. Still got a lot more work to do, though.

                    Comment

                      #11
                      waiting for Berryman ? at least get them soaking while your waiting....if no Berryman at the moment get some PineSol

                      ,

                      Comment

                        #12
                        CV ( BS carbs) slides only go down as far as they go and that's that because they just float with the diaphrams. You bench sync with the butterflies and the screws on the rear linkages.

                        VMs however can be held open by having the sync screws way to tight. Loosen all he sync nuts and screws on VMs and be dure they are all the way diown first. THEN you open them till theres just a sliver at the engine side and make all 4 look the same.
                        Last edited by chuck hahn; 09-27-2013, 10:02 PM.
                        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.

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                          #13
                          One other side note. When benching a set of carbs...VM or CV..you do it with the idle knob backede off so it is not toughing the throttle linkage. Once benched, turn the idle knob in about 1 1/2 to 2 turn after it just touches off on the linkage. The RPMs may be a bit high when you start the bike so be ready to adjust the knob.
                          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
                            Gatekeeper - I saw in a few other posts that letting them sit in there for too long can be bad for them and the parts aren't going to be here until tuesday next week.

                            Chuck - Where is the idle knob?

                            Comment

                              #15
                              Well I didn't mean you let them sit in there that long, I thought you could strip them down, and dip them for 24 to 48 hours, pull them out, dry them off and have them ready for when your parts come in and then assemble. Since your waiting on parts anyways might as well get something done...

                              idle knob, is that not the knob you can see in the 2 pics I posted, near the top of the carbs...?

                              .

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