78 gs1000c petcock nightmare

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  • Baldmike721
    • Jan 2026

    #1

    78 gs1000c petcock nightmare

    Hi Everyone this is my first post so please be patient and let me know if i am doing this right.My 78 gs1000 c petcock only works on reserve and then it will not provide enough gas to keep up with the throttle-checked the cap,vaccum line -removed the petcock and cleaned interior-strecthed the spring a bit like a mechanic friend suggested-still no better flow-you can see the fuel slowing down and speeding up with gas line removed.Now the vaccum line seems to suck too much air also-What is best next step please?
  • tkent02
    Forum LongTimer
    Past Site Supporter
    • Jan 2006
    • 35571
    • Near South Park

    #2
    Just replace it. Not worth messing with. Z-1 Enterprises has good ones fairly inexpensive.
    Welcome to the forum.
    http://img.photobucket.com/albums/v5...tatesMap-1.jpg

    Life is too short to ride an L.

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    • Baldmike721

      #3
      Thanks!! Didn't know where to find one thats not hundreds of dollars!! I appreciate the help! And thanks for the welcome too!

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      • Big T
        Forum LongTimer
        Past Site Supporter
        Super Site Supporter
        • Mar 2005
        • 12391
        • West Slope, OR

        #4
        is you tank at least 1/2 full of gas?

        What happens when you put it on Prime/
        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

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        • Guest

          #5
          Just keep in mind the one from Z1 that fit your bike have the outflows pointing toward the seat so your fuel line will have to be a lot longer in order to make the bend back towards the tank. It can work though. I bought one from them for an 850, it only lasted 3 yrs

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          • Guest

            #6
            Use one for a '77 GS750, hoses will be a little tight, but it will work, Chuck Hahn can give you the details better than I can.
            It's an not as expensive alternative to replacing that 1000 petcock with a new 1000 petcock, cost prohibitive.

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