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    #1

    Vacuum vs gravity

    For 80GS1100E

    Help me understand why Tom put a non-vacuum petcock on this bike. It is a nice new petcock. If there is some performance benefit I might leave it on but it not, Id rather not have to remmeber to turn the petcock off everytime I stop.

    Thanks guys for any advice.

    -Bob
    Tags: None
    #2
    Some people don't trust the vacuum petcock, or get fed up with them after a rebuild fails.

    I'm like you: I trust a new vacuum petcock more than I trust myself to remember to turn off a manual one.
    Dogma
    --
    O LORD, be gracious to me; heal me, for I have sinned against you! - David

    Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan
    --
     '80 GS850 GLT
    '80 GS1000 GT
    '01 ZRX1200R

    How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

    Comment

      #3
      He probably hated the 1980 no handle petcock
      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

        #4
        I also prefer a vacuum-operated petcock, but I am wondering where "gravity" figures in your thread title.

        .
        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

          #5
          Originally posted by Steve View Post
          I also prefer a vacuum-operated petcock, but I am wondering where "gravity" figures in your thread title.

          .
          because a vacuum tap is a vacuum operated gravity feed, where as a non vacuum tap is a manualy operated gravity feed tap
          1978 GS1085.

          Just remember, an opinion without 3.14 is just an onion!

          Comment

            #6
            Originally posted by Agemax View Post
            because a vacuum tap is a vacuum operated gravity feed, where as a non vacuum tap is a manualy operated gravity feed tap
            Yes, but the title says "vacuum vs gravity", as if one were gravity-activated and the other were vacuum-activated.

            Or maybe that one was gravity powered and the other was vacuum powered.

            Following your suggestion, the title should have been "vacuum vs manual".

            .
            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

              #7
              i think we all knew what he meant!
              1978 GS1085.

              Just remember, an opinion without 3.14 is just an onion!

              Comment

                #8
                Originally posted by Agemax View Post
                i think we all knew what he meant!
                Is that going to mean we can't have any fun with it?

                .
                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
                  Originally posted by Steve View Post
                  Is that going to mean we can't have any fun with it?

                  .
                  of course not haha,
                  1978 GS1085.

                  Just remember, an opinion without 3.14 is just an onion!

                  Comment

                    #10
                    I put a dual outlet Pingel on my bike to feed my RS38's I was told I needed one so that the bike wouldnt starve for fuel and lean out.
                    It is hard to remember to turn it off, I lost a full tank of gas on the ground one time
                    The fuel needles on the carbs only seal well when they want to. It drained out the overflows onto the ground.

                    Comment

                      #11
                      Originally posted by Steve View Post
                      Is that going to mean we can't have any fun with it?

                      .




                      I like the no hassle of the vacuum operated one.
                      Last edited by Mekanix; 04-02-2013, 09:11 PM.
                      Stephen.
                      1981 GSX540L "Frankintwin"
                      1989 GS500E Resto-mod .
                      400 mod thread
                      Photo's 1
                      Photos 2
                      Gs500 build thread
                      GS twin wiki

                      Comment

                        #12
                        All I've been doing in the last two weeks is working on petcocks. I convert them to manual to save a dime but I prefer vacuum ones (when working of course). If you have the bucks vacuum gives peace of mind but buy a new one now, you'll never know when that 30 year old one may crap out

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