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Petcock

Discussion in 'XJ Technical Chat' started by AlexDonaghue, Aug 19, 2012.

  1. AlexDonaghue

    AlexDonaghue Member

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    When i put my petock to run it revs the engine and i have to shut it off, but when its on res it runs fine. Please help
     
    AlexDonaghue, Aug 19, 2012
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  2. mlew

    mlew Well-Known Member

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    Which XJ are you working on? Put it in your signature so you won't have to remember.
    Possible the diaphram is leaking fuel into the vacuum line.
     
    mlew, Aug 19, 2012
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  3. AlexDonaghue

    AlexDonaghue Member

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    Sorry 1980 maxim xj650
     
    AlexDonaghue, Aug 19, 2012
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  4. AlexDonaghue

    AlexDonaghue Member

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    Is it the carb diaphram your talking about?
     
    AlexDonaghue, Aug 19, 2012
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  5. buzz81mach

    buzz81mach Member

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    Sounds like the diaphram in the petcock. If that is leaking, it would cause fuel to flow inside the vacuum line and act as if the enrichment circuit is on. Sounds like it is time for a petcock rebuild.
     
    buzz81mach, Aug 19, 2012
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  6. tabaka45

    tabaka45 Well-Known Member

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    I agree with buzz81mach. Petcock diaphragm is leaking and fuel is being drawn into the carb through the vacuum line.
     
    tabaka45, Aug 20, 2012
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  7. AlexDonaghue

    AlexDonaghue Member

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    I will rebuild and let you guys know what the outcome is, thanks for the help
     
    AlexDonaghue, Aug 20, 2012
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  8. tabaka45

    tabaka45 Well-Known Member

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    If you rebuild with the entire kit, it may not shut off in run and reserve when the engine is off. I had this problem. If so, you will need to lengthen the reach of the plunger attached to the diaphragm. Use a socket that just fits over the plunger and tap the vacuum end of the plunger very lightly. This will probably create a very small dimple in the diaphragm washer, but allow the plunger to properly seat. Worked for me.
     
    tabaka45, Aug 20, 2012
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  9. AlexDonaghue

    AlexDonaghue Member

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    So i pulled apart the petcock and it was more clean then any other part that i've taken off my bike. Allof the parts looked good so ijust reasembled it and put it back on the bike....but now the bikedoesnt start..... WTH?!?! Sound sounds like it wants to turn but doesnt. Now what?
     
    AlexDonaghue, Aug 20, 2012
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  10. buzz81mach

    buzz81mach Member

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    Is there fuel flow when moved to PRI?
     
    buzz81mach, Aug 20, 2012
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  11. AlexDonaghue

    AlexDonaghue Member

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    Yes the petcock flows during pri but not on run. Also i was looking through the manual and it looks like this is a different petcock on my bike not stock. Its not the square one its the one that looks like a house and has two tubes going into the tank, would this be a problem seeing is how it worked prior to this?
     
    AlexDonaghue, Aug 20, 2012
    #11

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