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Solex Carb Help Please!

Discussion in 'Early CJ5 and CJ6 Tech' started by Cabz5, Aug 16, 2022.

  1. Aug 16, 2022
    Cabz5

    Cabz5 New Member

    Tennessee
    Joined:
    Aug 16, 2022
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    9
    Hello.
    I've got a 64 cj5 with. A recently rebuilt solex carb.
    My issue is once at half throttle it breaks up bad!
    And for the life of me I can't figure out why?
    I've checked damn near everything I can think of.
    It idles perfect off idle is smooth choke works no vac leaks and the entire ignition system is new.

    Any ideas what else I can check?
     
  2. Aug 16, 2022
    dnb5853

    dnb5853 Member 2021 Sponsor

    Grand Mesa, CO
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    Aug 13, 2006
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    Welcome to the site!
    There's a thread for introductions.
    Introductions | ECJ5 (earlycj5.com)
    There should be plenty of help with your issue from similar members here.
    I have the Buick V6 with Rochester carb, so can't comment on your problem. :)
     
  3. Aug 16, 2022
    LKap

    LKap New Member

    Phoenix, Arizona
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    Aug 18, 2021
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    23
    New condenser? I had the same symptoms and it was a bad condenser.
     
    ITLKSEZ likes this.
  4. Aug 16, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Sep 21, 2002
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    12,014
    Yeah, new ignition doesn't mean good necessarily. Who rebuilt the carb? Is the ignition electronic or points and condenser?
     
    SoCalNickG likes this.
  5. Aug 16, 2022
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Hills of NH
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    There you go. Always check the newest thing first. Most carb problems are electrical.

    "choke works." It was my understanding that the solex does not have a real choke.
     
  6. Aug 16, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    It has a "fuel enrichment" instead of throttling the air intake.
     
  7. Aug 17, 2022
    Cabz5

    Cabz5 New Member

    Tennessee
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    Aug 16, 2022
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    I'll check the condenser, I rebuilt the carb on this jeep.
    I have done quite a few but this one has stumped.
    The jeep sat forever.
    It would not idle and the accelerator pump was half bad.
    But I could get it to go past half throttle and it didn't start breaking up until after the rebuild. That's why I figured carb issues.
    And correct on the no ckoke part.
    It is air inrichment that part works fine
     
  8. Aug 17, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Describe breaking up. Does it simply stumble? Does it run erratic, not fully rev, cough and sputter, or?
     
  9. Aug 17, 2022
    Cabz5

    Cabz5 New Member

    Tennessee
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    When it gets to half throttle it won't rev, sort of breaks up and stumbles.
    I replace the condenser and no change.
    Tmimg and idle speed set corectly
     
  10. Aug 17, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Sep 21, 2002
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    Have you tried using the "choke" when it starts to stumble? See if that seems to help? Just try it slowly to see how it acts.
     
  11. Aug 17, 2022
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor 2021 Sponsor

    East Tennessee
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    I assume your Jeep has the F-134?

    In what part of Tennessee are you located?
     
  12. Aug 17, 2022
    Cabz5

    Cabz5 New Member

    Tennessee
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    Aug 16, 2022
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    Yes and maynardville tn.
    I wish I could find a good used old stock carb.
    They just seemed simpler to me
     
    PeteL likes this.
  13. Aug 17, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    The YF is hands down a better carb., but they too can be finicky yet more straightforward easier to diagnose and get working properly. Diagnosing a Solex over the internet is a crap shoot.
     
    PeteL likes this.
  14. Aug 17, 2022
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor 2021 Sponsor

    East Tennessee
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    I see a rebuilt Carter YF in the forum classifieds, or you could place a WTB if you want a core to rebuild yourself.

    I prefer the Carter YF over a Solex, but many people get good service out of the Solex. They are simple and work well when right.
     
  15. Aug 18, 2022
    KeithR

    KeithR Member 2022 Sponsor 2021 Sponsor

    Canada
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    Oct 2, 2018
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    What a coincidence, I just replaced my carb with a Solex, too. It idles perfectly, but stales out after half throttle. I'll let you know if I figure it out


     
  16. Aug 18, 2022
    Cabz5

    Cabz5 New Member

    Tennessee
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    Oh please do! Did you replace the original carb?
    With this one?
    What was wrong with the old one?
     
  17. Aug 18, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I wonder if this is fuel pressure related?
     
  18. Aug 18, 2022
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor 2021 Sponsor

    East Tennessee
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    My thought too. If the Jeep has a mechanical fuel pump there is a spacer that should be used with the Solex, if it has an electric pump a pressure regulator is probably a good idea.
     
  19. Aug 18, 2022
    Cabz5

    Cabz5 New Member

    Tennessee
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    Mine is electric pump with a psi regulator set to 1.5

    Still breaks up at half throttle.
    I've tried choking it off with my hand to richen it and causing a vacuum leak to lean it out neither had any effect.
     
  20. Aug 18, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Have you drained the fuel bowl to see how much fuel is actually in there?
     
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