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Leaky Petcock

Discussion in 'XJ Technical Chat' started by gungrave9009, Jul 5, 2013.

  1. gungrave9009

    gungrave9009 Member

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    illionois
    The petcock on my 1981 XJ650 seems to be leaking, I just bought the petcock rebuild kit and it didn't seem to fix it. I think there is a small hole in the petcock body because I can see it spit a very tiny amount of fuel out while it's idling. I was wondering if my best bet would be to just go with the manual on/off petcock at this point?

    Anyone have any experience with these? I see a lot of people saying they're better then the OEM vacuum petcock.
     
    gungrave9009, Jul 5, 2013
    #1
  2. tabaka45

    tabaka45 Well-Known Member

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    I had the same problem and Chacal suggested a remedy that worked. Basically, I needed to lengthen the reach of the plunger and this was done by inserting the end with the o-ring into a small socket and lightly tapping it to slightly bend the metal plate. It worked perfectly. Just be very gentle with the tap since it only take a little to make it work.
     
    tabaka45, Jul 5, 2013
    #2
  3. gungrave9009

    gungrave9009 Member

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    Mine is leaking right where the two square seals meet the petcock, the seals are brand new so I'm assuming is has to be a hole in the actual petcock body. Anyone know if I could remedy this some how?
     
    gungrave9009, Jul 5, 2013
    #3
  4. sektorgaz

    sektorgaz Member

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    You could try doing a repair using alumaweld or similar compound.
     
    sektorgaz, Jul 5, 2013
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    While anything is possible, I doubt there's a hole in the body.

    More likely, the plastic spacer plate is positioned incorrectly or the two diaphragms didn't seat nice and flat and there's a wrinkle somewhere;

    OR you didn't prep the mating surfaces carefully.

    Give this a read: http://xjbikes.com/Forums/viewtopic/t=25058.html

    The small-body petcock such as came on the 650 shouldn't need its metal diaphragm plate tweaked.
     
    bigfitz52, Jul 6, 2013
    #5

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