Petcock Vacuum misbehaving

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  • verboseone
    #1

    Petcock Vacuum misbehaving

    I had my carbs cleaned.

    Since the cleaning I have gotten rid of a lot of problems that had nothing to do with the carbs at all. However, I believe the guy who cleaned my carbs neglected the area that pulls vacuum to the petcock.

    If I have my bike running, it might shut down generally randomly. Turns out I was losing vacuum. I have for several months been running using the prime position and haven't had this problem anymore.

    It looks like I might be opening my carbs soon to put the original jets back in. Can anyone point me to the area I need to look for the vacuum?

    My old mechanic told me he had to punch through something in the vacuum to get it to start, but that he just knocked it lose and whatever it was could come and block the hole again.
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    • tom203
      Forum Guru
      Past Site Supporter
      • Aug 2010
      • 8925
      • Norway,Maine
      #2
      Originally posted by verboseone
      I had my carbs cleaned.

      Since the cleaning I have gotten rid of a lot of problems that had nothing to do with the carbs at all. However, I believe the guy who cleaned my carbs neglected the area that pulls vacuum to the petcock.

      If I have my bike running, it might shut down generally randomly. Turns out I was losing vacuum. I have for several months been running using the prime position and haven't had this problem anymore.
      Since it ran OK on prime spot for months, I bet you need a new petcock to stop worrying about this pulling vacuum stuff.
      1981 gs650L

      "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

        Comment

        • verboseone
          #3
          I don't think I need a pet cock. I have since tested, the carbs do indeed lose vacuum to the hose gong to the petcock. Prime bypasses the vacuum valve.

          I also replaced the petcock with a new one less than two years ago.

            Comment

            • tkent02
              Forum LongTimer
              Past Site Supporter
              • Jan 2006
              • 35571
              • Near South Park
              #4
              The vacuum port is just a hole with a hose nipple on it. Do what was said in the other thread, the valves and synchronizing and such...
              http://img.photobucket.com/albums/v5...tatesMap-1.jpg

              Life is too short to ride an L.

                Comment

                • tom203
                  Forum Guru
                  Past Site Supporter
                  • Aug 2010
                  • 8925
                  • Norway,Maine
                  #5
                  Originally posted by verboseone
                  I don't think I need a pet cock. I have since tested, the carbs do indeed lose vacuum to the hose gong to the petcock. Prime bypasses the vacuum valve.

                  I also replaced the petcock with a new one less than two years ago.
                  The only way the vacuum from carb#2 nipple would be lost on way to petcock is if vac hose collapsed. You mentioned that your old mechanic poked something to get vac flowing- he might have damaged petcock, so it only works in prime. Get some clear 1/4 inch vinyl tubing, put on petcock vac fitting and suck- any fuel flow in "on" or "res" spot?
                  1981 gs650L

                  "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                    Comment

                    • Guest
                      #6
                      Posted this on your other post, will save me a little retyping.
                      Rarely dies on Idle. What is your idle RPM? - The GSResources Forums
                      http://www.thegsresources.com/_forum/showthread.php?t=191731
                      Place your GS carburetor, fuel or exhaust questions in this forum.

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                        • Guest
                          #7
                          The mechanic poke something to get it to run? K that ain't cool, apparently he doesn't know the bike. Sounds like he ruptured the diaphragm in the petcock. Yeah so if you get any fuel in the clear vacuum hose time for a new petcock. Don't bother trying a repair kit, that fix is pretty useless.

                            Comment

                            • verboseone
                              #8
                              He poked into the carbeurator with the fittin for the vacuum hose.

                              The hose is new vinyl vacuum hose.

                                Comment

                                • Guest
                                  #9
                                  Originally posted by verboseone
                                  He poked into the carbeurator with the fittin for the vacuum hose.

                                  The hose is new vinyl vacuum hose.
                                  That fitting should have never been out to begin with, could be loose enough to drop the vacuum at times.

                                    Comment

                                    • Guest
                                      #10
                                      Originally posted by verboseone
                                      He poked into the carbeurator with the fittin for the vacuum hose.

                                      The hose is new vinyl vacuum hose.
                                      The check valve for the vacuum line is in the petcock, maybe he just plugged the carb vacuum hole.

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