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Non vacuum petcock?

Discussion in 'XJ Technical Chat' started by Lokitruck, Aug 2, 2015.

  1. Lokitruck

    Lokitruck Member

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    can i run a non vacuum petcock on my xj650? Is so where do i get one?
     
    Lokitruck, Aug 2, 2015
    #1
  2. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Yes, you can, and we do have them in stock!
     
    chacal, Aug 2, 2015
    #2
  3. Stumplifter

    Stumplifter Well-Known Member

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    Loki, in a previous thread you were trouble shooting a vacuum operated Petcock that you had recently rebuilt.
    Are you sure you rebuilt the Petcock properly and replaced worn parts?
    Did you do it like this?
    http://www.xjbikes.com/forums/threads/rebuilding-the-yamaha-vacuum-fuel-valve-w-pics.25058/

    Maybe you don't need to buy a new non-vac one . . . .
    sorry Len! :oops:
     
    Stumplifter, Aug 2, 2015
    #3
  4. Lokitruck

    Lokitruck Member

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    I did rebuild it a while ago but have been unable to test it. To be honest I was just trying to simplifie things with a non vacuum petcock
     
    Lokitruck, Aug 2, 2015
    #4
  5. XJ550H

    XJ550H Well-Known Member Premium Member

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    nothing as simple as a crank case full of fuel when you forget to shut it off
     
    XJ550H, Aug 3, 2015
    #5
  6. k-moe

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

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    That'll only happen if he has a stuck float or crud keeping the float needle from seating. More likely is forgetting to turn the petcock on and stalling out a few miles from home.
     
    k-moe, Aug 3, 2015
    #6
  7. Stumplifter

    Stumplifter Well-Known Member

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    Stumplifter, Aug 3, 2015
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  8. dmlyster

    dmlyster Member

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    I concur. Followed Big Fitz procedures and had no issues.
     
    dmlyster, Aug 3, 2015
    #8
  9. k-moe

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

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    Fitz would be the first person to tell you that rebuilding a vacuum petcock sucessfully is only achievable if the casting is in good enough shape to be rebuildable. The vacuum o-ring has to seal well or it will still leak, even after polishing.
    Testing is recommended. No part should be installed on any machine without knowing if it works properly or not (most electrical parts excepted).
     
    k-moe, Aug 3, 2015
    #9
    Luis likes this.
  10. Lokitruck

    Lokitruck Member

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    I ve been having issues getting fuel to the carbs so when i say test it i mean i just got the tank back from paint and the new gas cap and the rebuilt petcock done i just need to put everything back together and test it. Heres the new color
     

    Attached Files:

    Lokitruck, Aug 3, 2015
    #10
    rocs82650 likes this.
  11. MattiThundrrr

    MattiThundrrr Not a guru

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    Bling!!
     
    MattiThundrrr, Aug 4, 2015
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    Xythin likes this.
  12. Lokitruck

    Lokitruck Member

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    Will a non vacuum petcock mess up the yics system?
     
    Lokitruck, Aug 4, 2015
    #12
  13. rocs82650

    rocs82650 Well-Known Member

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    No. Running a non vac pc is similar to doing the running synch with a auxiliary fuel tank.

    Gary H.
     
    rocs82650, Aug 4, 2015
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  14. Lokitruck

    Lokitruck Member

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    Recieved my non vacuum petcock from Chacal today and i was wondering what size fuel line is everyone running? Also what grade of gas is everyone using?
     
    Lokitruck, Aug 6, 2015
    #14
  15. wink1018

    wink1018 Active Member

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    6mm fuel line.

    The cheap stuff works. These engines are not high compression that you need to run 90+ octane. However, if you can find a pure gas station, I highly recommend it. Your tank and carbs will thank you too.
     
    wink1018, Aug 6, 2015
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  16. Lokitruck

    Lokitruck Member

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    Im glad you said that wink. Can i use stabil?
     
    Lokitruck, Aug 6, 2015
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  17. painter

    painter Active Member

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    Lokitruck That blue tank is just a couple shads darker than mine, very nice! I have ran cheap gas and mid grade, don't see any difference. I do use pure gas and stabil in it for winter storage
     
    painter, Aug 6, 2015
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  18. XJ550H

    XJ550H Well-Known Member Premium Member

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    in my sidecover it says to use regular gas tested with 91 octane.
    I add Berryman B-12 CHEMTOOL carb cleaner to every tank . Sta-Bil is for storage.
     
    XJ550H, Aug 6, 2015
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  19. rocs82650

    rocs82650 Well-Known Member

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    I run 87 + a double shot of Seafoam. Don't forget the inline sintered fuel filter. Might also want to visually inspect the gasket on the gas cap.

    Gary H.
     
    Last edited: Aug 6, 2015
    rocs82650, Aug 6, 2015
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  20. k-moe

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

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    I use nothing but gas during the riding season(s). Whatever low-test gas is at the pump. I use Stabil for winter storage. The best way to keep your carbs clean and happy is to ride.

    On long trips (3 or more hours of uninterrupted riding at highway speeds) during hot weather I drop in 1 oz of Marvel Mystery Oil per tankful of gas to help keep the top end happy.
     
    k-moe, Aug 6, 2015
    #20
  21. dmlyster

    dmlyster Member

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    I'm impressed, my butt starts to hurt after an hour and need to stop. How big is your tank? But yea, MMO.
     
    dmlyster, Aug 7, 2015
    #21
  22. k-moe

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

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    The key to long days is having a good seat and a practiced backside. The stock seats are really good for twisties and short trips, but not much else.
     
    k-moe, Aug 7, 2015
    #22
  23. Lokitruck

    Lokitruck Member

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    Sorry guys I'm all the place with this thread. I can't get the pin out of my caliper to remove the brake pads. Is there a trick? Also what brake fluid should I use
     
    Lokitruck, Aug 7, 2015
    #23
  24. k-moe

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

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    Now is when we have to clear up which XJ650 you have. Seca or Maxim?
     
    k-moe, Aug 7, 2015
    #24
  25. Lokitruck

    Lokitruck Member

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    Xj650 maxim
     
    Lokitruck, Aug 7, 2015
    #25
  26. k-moe

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

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    OK then. You hae a very interesting brake caliper.
    Have you removed the pivot bolt from the rear of the caliper?
    There is a locknut at the bottom, so the bolt will just spin in place unless you put a wrench on that locknut.
     
    k-moe, Aug 7, 2015
    #26
  27. rocs82650

    rocs82650 Well-Known Member

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    Add this to your signature.

    Gary H.
     
    rocs82650, Aug 7, 2015
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  28. Lokitruck

    Lokitruck Member

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    Good idea roc. Thank you
     
    Lokitruck, Aug 7, 2015
    #28
    rocs82650 likes this.
  29. rocs82650

    rocs82650 Well-Known Member

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    You bet.

    Gary H.
     
    rocs82650, Aug 7, 2015
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