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XJ650 Petcock Replacement

Discussion in 'XJ Technical Chat' started by Gork, Apr 19, 2017.

  1. Gork

    Gork Member

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    Hello all,

    My bike came with a non-vacuum replacement petcock.

    I'm going to remove it prior to repainting the tank - any comments on leaving the non-standard petcock or go back to the original vacuum style?

    Any recommendations on a new non-vacuum or just consider the correct XJ4Ever vacuum one?
     
    Gork, Apr 19, 2017
    #1
  2. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    As long as you can remember to always turn the manual (non-vacuum) fuel valve on and off at the appropriate times, then it works just fine. The original automatic fuel valve (vac-operated) offers the utmost in convenience.
     
    chacal, Apr 19, 2017
    #2
    Stumplifter likes this.
  3. cgutz

    cgutz Well-Known Member

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    Vacuum petcocks help protect your lower engine/oil supply from leaking carb float valves. As Chacal indicated, if you turn it off each ride, ok. But if something leaks somewhere and you didn't turn it off, you may be changing your oil, cleaning up gas from the garage floor, etc.

    For me, vacuum operated...because I know the time I forget will be the time a 35 year old bike has something else in the fuel delivery system fail...
     
    cgutz, Apr 20, 2017
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    chacal likes this.
  4. OldFleetGuy

    OldFleetGuy Member

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    OldFleetGuy, Apr 20, 2017
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  5. Gork

    Gork Member

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    I get the message loud and clear - will take the original petcock from the saddle bag and see how serviceable it is, rebuilt it as needed.

    Now I just have to figure out what hoses went where, should not be a problem.
     
    Gork, Apr 20, 2017
    #5
  6. XJ550H

    XJ550H Well-Known Member Premium Member

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    the nipple diameter will tell you which one is fuel line
     
    XJ550H, Apr 20, 2017
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  7. cgutz

    cgutz Well-Known Member

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    When you order the new vacuum petcock from XJ4Ever, Len (Chacal) will be able to tell you which is which :).

    IMHO, buying elsewhere should not be considered an option, too many wrong parts get purchased that way....!
     
    cgutz, Apr 20, 2017
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  8. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    k-moe, Apr 20, 2017
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  9. Gork

    Gork Member

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    I have a petcock, Yamaha, part number 3AL-24500-00-00, NIB supplied by the previous owner with some other small parts.
    No good or seek an alternative?

    I saw the rebuilding doc, awesome - the rear brake one is great too, I just keep looking for more of them!
     
    Gork, Apr 20, 2017
    #9
  10. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    We have a whole section. See the first link in my signaure.
     
    k-moe, Apr 20, 2017
    #10

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