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carb pilot jet stripped

Discussion in 'XJ Technical Chat' started by nillawaferjam, Mar 10, 2017.

  1. nillawaferjam

    nillawaferjam Member

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    Just bought a new carb for my 1981 xj650, came with out pilot jets. So I used the pilot jets from my old car which wasn't worth rebuilding. In removing one of the jets from the new carb I marred the threads in the housing and cannot get the jet to screw back in. I can't use any of the housings from my old carb because it's a 550 and I have a 650. Does anyone know the thread size of the pilot jet? Also I'm gonna need a new jet.. Thanks!!
     
    nillawaferjam, Mar 10, 2017
    #1
  2. k-moe

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

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    I'm somewhat sure that the Mikiuni carbs from the 550 have a different thread pitch than the Hitachi carbs on the 650, which is why they won't thread in to the 650 carbs.

    Start a conversation with Chacal. He can hook you up with jets, and the thread pitch and size so you can get a tap to fix the marred threads (he might even have a tap to sell).
     
    k-moe, Mar 10, 2017
    #2
  3. tabaka45

    tabaka45 Well-Known Member

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    Pilot jet from your car!? Probably not the right size and the threads may not be metric. Contact Chacal for the correct jet and he probably can give you the correct thread.
     
    tabaka45, Mar 10, 2017
    #3
  4. k-moe

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

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    I read it to mean old carb.
     
    k-moe, Mar 10, 2017
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  5. tabaka45

    tabaka45 Well-Known Member

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    That makes more sense. Brain dead on this end I guess!
     
    tabaka45, Mar 11, 2017
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  6. MattiThundrrr

    MattiThundrrr Not a guru

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    That's two of us... exclamation points and fireworks going off in my head cuz I thought it was from the car!
     
    MattiThundrrr, Mar 11, 2017
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  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    did no t know hatachi used that style pilot jet Could be he is talking pilot air jet from mikuni

    mikuni pilot jet 550
    mik pilot jet.JPG




    hatachi pilot jet
    [​IMG]
     
    Last edited: Mar 11, 2017
    XJ550H, Mar 11, 2017
    #7
  8. nillawaferjam

    nillawaferjam Member

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    Well this is about the most active forum I've ever used, really impressed. The jets I used from the 550 all threaded in fine except for the one which came with my carb. It actually stripped on the way out. Those jets aren't looking firimiliar, I'm talking about these:

    It is a Hitachi carb
     

    Attached Files:

    nillawaferjam, Mar 11, 2017
    #8
  9. MattiThundrrr

    MattiThundrrr Not a guru

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    Hey, thanx for the great pics. I just learned something from #3. I never saw the Hitachi logo on the bowl before. Jeez, I gotta take my carbs to church!
     
    MattiThundrrr, Mar 11, 2017
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  10. k-moe

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

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    Those aren't jets. They are the idle mixture screw needles. They came in two thread pitches, depending on what year the carbs were manufactured in.
    I still suggest starting a conversation with Chacal. Unfortuantely I am traveling and can't access my toolbox to tell you the tap sizes.
     
    Last edited: Mar 14, 2017
    k-moe, Mar 11, 2017
    #10
  11. nillawaferjam

    nillawaferjam Member

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    Thanks everyone. Got in touch with Chacal, he hooked me up with what I needed
     
    nillawaferjam, Mar 14, 2017
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    k-moe likes this.
  12. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Idle mixture screw---- not a jet
     
    hogfiddles, Mar 14, 2017
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  13. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Oops didn't see kmoe already got to ya. Yes, two different threads-- coarse and fine.

    -also just saw you're hooked up with Chacal. You'll be ok now
     
    hogfiddles, Mar 14, 2017
    #13

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