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    #1

    Possible Petcock Problem

    My '79 GS750E developed in a new issue....it won't stay running unless the petcock is in the prime position. I suspect there's a problem with the petcock...time for a petcock rebuild kit or a new petcock? Ironically, new carb and intake O-rings were on the way as routine maintenance before this issue popped up. Any other issues I should be checking?
    '79 GS750 - 4th and current ride...first since 1983
    '73 CB350 - 1st ride
    '76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
    '79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a house
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    #2
    Originally posted by knotscott View Post
    My '79 GS750E developed in a new issue....it won't stay running unless the petcock is in the prime position. I suspect there's a problem with the petcock...time for a petcock rebuild kit or a new petcock? Ironically, new carb and intake O-rings were on the way as routine maintenance before this issue popped up. Any other issues I should be checking?
    Me, I would get a new petcock, kits have a high failure rate it seems. Check over your rubber intake boots (engine side and air filter side) Orings you already ordered, make sure they are soft and pliable. Hard boots will crack and not seal good, causing air leaks you don't need. Makes tuning a *itch.

    Would be a good time for a valve adjustment if you haven't done one in a while. And would be a good time as well to give your electrical connections a good cleaning and replace anything questionable and or burnt.
    sigpicMrBill Been a GSR member on and off since April 2002
    1980 GS 750E Bought new in Feb of 1980
    2015 CAN AM RTS


    Stuff I've done to my bike 1100E front end with new Sonic springs, 1100E swing arm conversion with new Progressive shocks installed, 530 sprockets/chain conversion, new SS brake lines, new brake pads. New SS fasteners through out. Rebuilt carbs, new EBC clutch springs and horn installed. New paint. Motor runs strong.

    Comment

      #3
      I'd check the vacuum line to make sure it hadn't cracked, or popped off
      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
        Originally posted by Big T View Post
        I'd check the vacuum line to make sure it hadn't cracked, or popped off
        The checks in the mail! I hadn't thought of that, so I took a look....sure enough, the vacuum line was disconnected. That should help me sleep better tonight! Thanks to both of you for the replies!
        '79 GS750 - 4th and current ride...first since 1983
        '73 CB350 - 1st ride
        '76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
        '79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a house

        Comment

          #5
          Occam's Razor!!
          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

            #6
            Got to love the quick cheap fixes, especially when they actually work!


            Life is too short to ride an L.

            Comment

              #7
              Reconnecting a vacuum line will help the mixture in that cylinder too.

              .
              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

                #8
                D'oh forgot about that dang vacuum line.
                sigpicMrBill Been a GSR member on and off since April 2002
                1980 GS 750E Bought new in Feb of 1980
                2015 CAN AM RTS


                Stuff I've done to my bike 1100E front end with new Sonic springs, 1100E swing arm conversion with new Progressive shocks installed, 530 sprockets/chain conversion, new SS brake lines, new brake pads. New SS fasteners through out. Rebuilt carbs, new EBC clutch springs and horn installed. New paint. Motor runs strong.

                Comment

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