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    #1

    Petcock vacuum o-ring preservation

    Petcock vacuum o-ring preservation

    Indulge my OCD.

    Received a replacement petcock recently. Noticed it was shipped in PRIME position. Concluding it was shipped/stored in that manner so the O-ring in the vacuum diaphragm doesn't get permanently compressed in storage.

    Wondering – what about putting an in-line shutoff between petcock and carbs so during periods of longer non-use the shutoff can stop fuel flow and then leave the petcock in PRIME to preserve deformation of that o-ring?

    I was going to put in a shutoff there anyway just to avoid the dreaded fuel in the crankcase happenstance so I guess this question is more about leaving the petcock in PRIME during storage for the benefit of the petcock.

    Thoughts?
    1981 GS750L - Owned since 1990 when graduated high school and since have been discovering all the things not disclosed by seller.
    1983 GS750E - bought in 2016 as a rough runner to use while rebuilding 81L and then to combine with ES to make one good one
    1983 GS750ES - bought in Toronto in 2015 on a lark as a non-runner, missing front cowling and exhaust - If you have a 1983 750ES front cowling let me know! Blue would be nice
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    #2
    It had to be shipped in SOME position...RIGHT!!!! Is PRIme worse than say in RESereve?????? or ON????

    Yes your OCD is way over thinking chit. Just give it a squirt of penetrating oil around the lever area and work it back and forth to keep it lubed..done.
    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

      #3
      This is kind of off-the-wall, but what I did with a stuck petcock was to spray silicone in to the petcock liberally, and then place the petcock on the stove-top just above where the gas pilot burns. I checked the temp of the area with an infrared thermometer, came up to 100 degrees. Tried to move the lever with pliers without too much force a couple of times, and about the third time, it moved with a 'pop' and was smoothly free after that.
      sigpicSome of the totally committed probably should be.
      '58 + '63 Vespa 150's' (London, GB/RI, US)
      '67 X6 T20 ('67 Long Beach, Ca.- misty-eyed)
      '71 Kaw. A1-ugh ('71 SF, CA- worked @ Kaw dlr)
      '66 Yam. YL1('72 SF-commuter beater)
      '73 Kaw. S2A-2Xugh ('73 SF-still parts slave)
      '78 GS 750C ('77 SF-old faithful-killed by son)
      '81 KZ 750E ('81 SF-back to Kaw. dlr)
      '81 GS 650G ('08 back to NE&ME- (project)
      '82 GS '82 (2) GS650GZ, L, Middlebury, G current

      Comment

        #4
        The lever can stick to the oring or the flat rubber plate with the holes in it behind the lever from being dry and not moved for a while. That's why I said to spray some oil on it from time to time and work it in well.
        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
          I re-read to make sure but i was not asking about it being stuck. What i was wondering is if it is better for the vacuum petcock to be dis-engaged rather than engaged. In the prime position the o-ring/diaphram is held open mechanically (o-ring is not touching the seat). This is the same position that occurs when vaccum opens the petcock. It makes sense that the petcocks get shipped/stored that way because the o-ring is not under pressure.

          Considering failing petcocks are not uncommon after some use, the question was about keeping the o-ring disengaged by putting it in prime position in the hopes of having the o-ring keepit.s shape better.
          1981 GS750L - Owned since 1990 when graduated high school and since have been discovering all the things not disclosed by seller.
          1983 GS750E - bought in 2016 as a rough runner to use while rebuilding 81L and then to combine with ES to make one good one
          1983 GS750ES - bought in Toronto in 2015 on a lark as a non-runner, missing front cowling and exhaust - If you have a 1983 750ES front cowling let me know! Blue would be nice

          Comment

            #6
            It won't matter. If the oring takes a shape from the seat contact it will still seal just fine. Unavoidable. OTOH, if it is dried out or stiff, it can leak. That is aging, plain and simple.
            NO PIC THANKS TO FOTO BUCKET FOR BEING RIDICULOUS

            Current Rides: 1980 Suzuki GS1000ET, 2009 Yamaha FZ1, 1983 Honda CB1100F, 2006 H-D Fatboy
            Previous Rides: 1972 Yamaha DS7, 1977 Yamaha RD400D, '79 RD400F Daytona Special, '82 RD350LC, 1980 Suzuki GS1000E (sold that one), 1982 Honda CB900F, 1984 Kawasaki GPZ900R

            Comment

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