Announcement

Collapse
No announcement yet.

CV fuel hole measurement

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

    CV fuel hole measurement

    Can someone with a CV body laying around throw some calipers to the fuel tee holes and let me know what it is? I want to compare the measurement to the holes in VM carbs. Thanks
    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.

    #2
    9.0 mm at the entrance, tapering to 8.7 mm deeper in the passage. VMs are about 11.0 mm.

    BTW, I bought some brass Tees from a guy on ebay that claims they fit VM's, only they are 9.0 mm. Hit the return button and since they came from China was told to just keep them. I'm starting to think they would work in some CV carbs like these as long as the end was shaved down. I've got a lathe laying in wait too. Only problem is that the inlet nipple is much smaller than the common Mikuni Tee.
    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


      #3
      Hi Chuck, with my cheapo harbor freight calipers it looks to be pretty close to 9.5mm
      1982 GS1100G

      ....I've learned alot by making stupid mistakes..

      Comment


        #4
        If the inlet is beefy enough could it be bored out a little?
        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


          #5
          oops, looks like Ness hit send before I did. I'd go with his numbers
          1982 GS1100G

          ....I've learned alot by making stupid mistakes..

          Comment


            #6
            Originally posted by chuck hahn View Post
            If the inlet is beefy enough could it be bored out a little?
            A little. You would need a reamer, not a drill bit.
            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


              #7
              Suzuki always over did it in many areas. The inlet will probably flow ample fuel to match consumption.
              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


                #8
                I've seen fuel Ts on Z1Enterprises. Are those not compatible with VM or CV carbs?
                - 1983 GS850L ~ 30,000 miles and going up - Finally ready for a proper road trip!
                - 1977 GS750B - Sold but not forgotten

                Comment


                  #9
                  They are different sizes. What I'm getting at is that if you remove the hard shrunk rubber and stack 3 or 4 orings on there you have made a repairable CV fuel tees with orings instead of having to buy another or go through a bunch of witch craft voodoo to try to stop the leaks.
                  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
                    They are different sizes. What I'm getting at is that if you remove the hard shrunk rubber and stack 3 or 4 orings on there you have made a repairable CV fuel tees with orings instead of having to buy another or go through a bunch of witch craft voodoo to try to stop the leaks.
                    I've heard of people using a razor blade or exacto knife and cuting off the portion of the rubber coating that's raised up, similating an O-ring, then installing a real O-ring in it's place. I can imagine this as a reasonable approach. I would NOT remove all the rubber and just stack some O-rings though, because there would be nothing holding the O-rings in a stable position. Regarding soaking the Tee in gasoline to swell the rubber, this is exactly what happens with nitrile o-rings when gas hits them; they swell up and create a solid seal. The ideal fix would be to replace the Tee with a metal version w/real O-ring grooves. I've made a good many fuel Tee's out of brass on my lathe and it's kind of relaxing work, although somewhat time consuming.

                    Here is a photo of a fuel tee for a Keihin carb I made a while back...

                    P1030580 by nessism, on Flickr
                    Last edited by Nessism; 12-28-2021, 12:31 PM.
                    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


                      #11
                      Originally posted by Nessism View Post
                      I've heard of people using a razor blade or exacto knife and cuting off the portion of the rubber coating that's raised up, similating an O-ring, then installing a real O-ring in it's place. I can imagine this as a reasonable approach. I would NOT remove all the rubber and just stack some O-rings though, because there would be nothing holding the O-rings in a stable position. Regarding soaking the Tee in gasoline to swell the rubber, this is exactly what happens with nitrile o-rings when gas hits them; they swell up and create a solid seal. The ideal fix would be to replace the Tee with a metal version w/real O-ring grooves. I've made a good many fuel Tee's out of brass on my lathe and it's kind of relaxing work, although somewhat time consuming.

                      Here is a photo of a fuel tee for a Keihin carb I made a while back...

                      P1030580 by nessism, on Flickr
                      Fuel tees look great..Good work..Nice...Thanks..
                      sigpic 82 gs1100ez 1168 Wiseco,Web .348 Cams,Falicon Sprockets,Star Racing Ported Head,1mm o/s Stainless Valves,APE Springs,Bronze Guides,etc.APE Billet Tensioner,36CV Carbs,Stage 3 Dynojet,Plenum w/K&N filter,Trued,Welded,Balanced,Crank w/Katana rods & Billet left end, FBG backcut trans, VHR HD Clutch basket,APE nut,VHR High volume oil pump gears,1150 Oil cooler,V&H Megaphone header w/Competition baffle,Dyna S,Coils,Wires,etc.Other misc.mods.

                      Comment

                      Working...
                      X