Announcement

Collapse
No announcement yet.

Looking for tips, tricks and advice on rebuilding VM carbs

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Looking for tips, tricks and advice on rebuilding VM carbs

    Hi all,
    So I'm about to start rebuilding the VM carbs on my project 1978 GS550E. I have the rebuilding guide off of the forum here and was wondering...anybody have any tips, tricks or advice I should be aware of before I start? Any help or guidance would be greatly appreciated.

    They have been completely torn down, dipped and I have the O-ring set from Robert Barr so I'm pretty good to go. I have also rebuilt the CV carbs on my 82 GS750EZ so I'm not a complete newby on this.

    Just thought it might be wise to get any sage wisdom from more experienced carb people...

    Gotta head off to work so I'll check back here in about 9 hours so please feel free to chime in everybody! Thanks
    sigpic

    1974 GT750 ...done, running and sold
    1974 GT550 .... under construction (done and sold)
    1978 GS550........all stock, running (going to do 550/650 build with it)
    1978 GS1000...another project (Given to son #2)
    1982 GS750EZ ...daily driver(given to son#1)
    1982 GS1100G...completed and traded to son #2 for the 750 back
    1982 GS750EZ...daily driver (got it back in trade with son #2)
    1983 GR650 Tempter.... engine rebuild completed (and sold)

    #2
    Take them apart. Clean them. Check the float adjustment. Put them back together. Don't remove the needle jet, it won't go back in. Bench synch. Vacuum synch and tweak the needles. Not much to it really. If you get stuck, Call Chuck Hahn, he's the new resident expert.
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

    Comment


      #3
      Oil the O-rings before inserting the parts together to avoid tearing your new O-rings.
      Ed

      To measure is to know.

      Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

      Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

      Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

      KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

      Comment


        #4
        Make sure the spring loaded plunger in the end of the float needle is not stuck nor the spring too weak (very subjective).

        Rotate the assembled carb rack until the floats are lightly resting on the float needles, blocking the rack to hold in that position, then measure the float height on both sides of each float, bending the float arm and tang as necessary.

        be very detail orientated when cleaning/checking.

        bench check the fuel levels externally.

        as was said before do it one time and one time only.

        tkent02...
        the needle jets can be removed and reinstalled, although not needed under normal circumstances.
        De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

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

        Comment


          #5
          Another thing is to make sure the fuel screw tips are not broken off in the carb bodies. And measuring the fuel level is better than float height if you really want to make sure the floats are set correctly.
          Ed

          To measure is to know.

          Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

          Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

          Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

          KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

          Comment


            #6
            Originally posted by rustybronco View Post

            tkent02...
            the needle jets can be removed and reinstalled, although not needed under normal circumstances.
            I could never get them back in, what do you use to do this?
            http://img.photobucket.com/albums/v5...tatesMap-1.jpg

            Life is too short to ride an L.

            Comment


              #7
              a slight bevel with some crocus cloth to the end where it fits into the carb body and tapped into place with a large chop stick. some go back in without the bevel, some will not.
              De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

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

              Comment


                #8
                Thanks to everyone who added their wisdom. I will follow all of your advice.

                They have been completely taken apart and sitting on the kitchen table ( feeling the wrath of the wife!!) after having been in carb dip. I also have rebuild kits for all 4 so the new parts should work just fine. I will especially take the time to be sure the floats are set right and double check them. And I am VERY detail oriented!

                Thanks again...and if anyone else wants to add anything, please feel free to do so!!!
                sigpic

                1974 GT750 ...done, running and sold
                1974 GT550 .... under construction (done and sold)
                1978 GS550........all stock, running (going to do 550/650 build with it)
                1978 GS1000...another project (Given to son #2)
                1982 GS750EZ ...daily driver(given to son#1)
                1982 GS1100G...completed and traded to son #2 for the 750 back
                1982 GS750EZ...daily driver (got it back in trade with son #2)
                1983 GR650 Tempter.... engine rebuild completed (and sold)

                Comment


                  #9
                  Warning: off the shelf "carb kits" are notorious for poor quality. Common GSR wisdom is to get an O-ring kit from cycleorings.com, including the O-rings for your intake boots (mandatory to replace). Reuse the stock Mikuni jets unless they are damaged in some way.
                  Ed

                  To measure is to know.

                  Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                  Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                  Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                  KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                  Comment


                    #10
                    Okay..I will check the rebuild kits vs the existing hardware. I already have the O-ring set from cycleorings so I'm ready to go there. Thanks!
                    sigpic

                    1974 GT750 ...done, running and sold
                    1974 GT550 .... under construction (done and sold)
                    1978 GS550........all stock, running (going to do 550/650 build with it)
                    1978 GS1000...another project (Given to son #2)
                    1982 GS750EZ ...daily driver(given to son#1)
                    1982 GS1100G...completed and traded to son #2 for the 750 back
                    1982 GS750EZ...daily driver (got it back in trade with son #2)
                    1983 GR650 Tempter.... engine rebuild completed (and sold)

                    Comment


                      #11
                      Tight

                      Don't over tighten ANYTHING. It's not necesssary and, besides.....you'll probably be the guy who works on them next time.
                      1980 GS1100E....Number 15!

                      Comment

                      Working...
                      X