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Graphic of how CV carbs function

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    #1

    Graphic of how CV carbs function

    Someone needs to get ahold of a MOD and get this made a STICKY.

    Watch
    https://www.facebook.com/interestingengineering/videos/1574395025963529/


    Youtube link.....not the best video seeing i was taping off the computer screen but you get the idea. Note that oue GS carbs have the mixture screws on top but its the same thing

    SAM 1194
    https://www.youtube.com/watch?v=JS34TkkeYdo&feature=youtu.be
    How a CV Carburetor operates
    Last edited by chuck hahn; 10-22-2017, 08:25 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.
    Tags: None
    #2
    Very cool, but I'm not sure if it can be seen without a Facebook account.
    :cool:GSRick
    No God, no peace. Know God, know peace.

    Eric Bang RIP 9/5/2018
    Have some bikes ready for us when we meet up.

    Comment

      #3
      Im uploading now to Youtube and will be posting a link shortly...stand by.
      Last edited by chuck hahn; 10-22-2017, 08:24 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.

      Comment

        #4
        Youtube link added to post #1
        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
          Deleted in favor of the post below
          Last edited by Wingsconsin; 10-23-2017, 04:08 PM.

          Comment

            #6
            cool. found the original movie :
            Rijk

            Top 10 Newbie Mistakes thread
            CV Carb rebuild tutorial
            VM Carb rebuild tutorial
            Bikecliff's website
            The Stator Papers

            "The thing about freedom - it's never free"

            Comment

              #7
              Was able to save the video to my desktop and upload it directly to YouTube

              How CV Carburetor works
              https://www.youtube.com/watch?v=5bYRk9OoR6U
              This graphic video explains how a CV Carburetor works.. via Roma Custom Bike

              Comment

                #8
                Nice video, but it's blatantly WRONG about how the vacuum lifts the slide.

                They show ported manifold vacuum lifting the slide. Maybe on some other carbs, but NOT on a GS.
                In that situation, when the throttle is just barely opened, the vacuum port will be exposed to manifold vacuum, which should lift the slide almost instantly. As more throttle is applied, manifold vacuum will drop to near ZERO, which would have the slides slamming shut, right when you need them open, at full throttle.

                The vacuum that lifts the slides comes from the air rushing UNDER the slide, through the venturi. The hole on the bottom of the slide 'reads' that vacuum and ports it to the chamber above the diaphragm, THAT is what lifts the slides. It is not directly related to throttle position, it is related to the velocity of air through the venturi. Yes, that will be controlled by the throttle, but not directly.

                I see that the original movie has been found, but I was able to see the Farcebook version, I do NOT have an account.

                .
                sigpic
                mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                #2 son: 1980 GS1000G
                Family Portrait
                Siblings and Spouses
                Mom's first ride
                Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                (Click on my username in the upper-left corner for e-mail info.)

                Comment

                  #9
                  (haha good catch Steve YUP that don't look like this...)
                  Mikuni CV EXPLAIN.jpg

                  Comment

                    #10
                    Originally posted by Gorminrider View Post
                    (haha good catch Steve YUP that don't look like this...)
                    [ATTACH=CONFIG]53114[/ATTACH]
                    This is a cut from the factory manual. That section goes on to show more detail including which ait jet is which, and schematic data which allows you to easily figure out where carb cleaner should be coming out if you spray it into any of the orifices. This allowed me to find and fix a clogged air passage which was not cleaned by a soak on a 1000G. It is found in the high resolution GS850G manual on Cliff's site. It can be hard to find there, as the file is so large.

                    Super useful information
                    sigpic Too old, too many bikes, too many cars, too many things

                    Comment

                      #11
                      Its just a BASIC explanation guys....unknot your undies.
                      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

                        #12
                        Yeah, but even BASIC should be CORRECT.

                        .
                        sigpic
                        mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                        hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                        #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                        #2 son: 1980 GS1000G
                        Family Portrait
                        Siblings and Spouses
                        Mom's first ride
                        Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                        (Click on my username in the upper-left corner for e-mail info.)

                        Comment

                          #13
                          On some models im sure it is correct..maybe not a 80s Zookey but its correct for some bike somewhere.
                          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
                            maybe there is a difference between CONSTANT VELOCITY and CONSTANT VENTURI. Ive seen both mentioned in service manuals. havent personally investigated difference between the two representations...or if there is ant differences at all.
                            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

                              #15
                              A "constant velocity" is obtained with a VARIABLE venturi. The slide is what makes it variable.

                              .
                              sigpic
                              mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                              hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                              #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                              #2 son: 1980 GS1000G
                              Family Portrait
                              Siblings and Spouses
                              Mom's first ride
                              Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                              (Click on my username in the upper-left corner for e-mail info.)

                              Comment

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