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134f, Carter Yf, Won't Idle Smooth, Wants To Hunt?

Discussion in 'Early CJ5 and CJ6 Tech' started by 70cj5134f, Mar 30, 2020.

  1. Mar 30, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    749
    Just started this from one day to next?
    Idle was so bad, I had to turn up 2 turns just to run?
    Air screw has little effect.
    It actually causes a whistle at some settings?
    Took top off, carb straw blew through all I could reach, no difference?
    Smells rich at idle, when reving up and down?
    At idle, it REVS up to bout 1k, then falls down, almost dies, then idles up to 1k again?
    Hot or cold same? I gaped points, no difference?
    Can't find any vacuum leaks?
    I have a gauze air filter, covered with a filter wrap, carb looked clean In side?
     
  2. Mar 30, 2020
    Greevesman

    Greevesman Member

    Napa, Ca
    Joined:
    Oct 12, 2014
    Messages:
    417
    Fine grit in bottom of float bowl? I have had that happen. Take a brake bleeder and suck all the gas out. How about the float valve? Check it out.
     
  3. Mar 30, 2020
    scoutpilot

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
    Messages:
    428
    What is the composition of the needle and seat? Rubber-tipped needle or all metal? What is the float setting? The low-speed jet may be too small. Check ball and weight? Or just a pointed weight?
     
  4. Mar 30, 2020
    DoubleBit

    DoubleBit Member

    East of Auburn, CA
    Joined:
    Mar 27, 2003
    Messages:
    62
    So this on a carb/engine that was otherwise running fine until recently?

    Ideas to investigate:
    Sinking float?
    Failing needle/seat assembly? Or junk in between needle and seat?
    Excessive fuel pressure?
    Vacuum leak? (likely a big one)
     
  5. Mar 30, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    749
    Thanks for input, coming off, and complete disassembly in progress!
    Yes it was running great 1 night.
    Then next day doing this?
    I've had this happen before years ago, just can't remember the fix?
    Time for an all out bath!
     
  6. Mar 30, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,754
    Hunting is often a slightly lean mix. Could be many causes. Water in carb bowl?

    I'd have run a vacuum gauge test before removing it, and I'd set the ignition timing and points to spec before doing the final tuning.

    Meanwhile, rebuild to exact specs FOR JEEP. As scoutpilot indicates, it matters what components (and settings) are used. Not all kits have the right parts.
     
  7. Mar 31, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    749
    Took apart, cleaned all, still trouble, set points, and timing, still no fix?
    It's give trouble 3 years, came off amc-6 . New solex ordered?
     
  8. Mar 31, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,367
    And it wasn't too much for the F-head when you originally put it on?
     
  9. Mar 31, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,367
    Did your post say you had it on the F-head for 3 years?
     
  10. Mar 31, 2020
    jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sheboygan
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    Jun 28, 2006
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    2,754
    i read it as "it came off of an AMC-6, where it has given me trouble for the past 3 years. now it isnt working on the 134F head engine at all. i ordered a new solex just now".
     
  11. Mar 31, 2020
    DoubleBit

    DoubleBit Member

    East of Auburn, CA
    Joined:
    Mar 27, 2003
    Messages:
    62
    Ah oh. The story has changed. Yes, get the correct carb on there.
     
    Glenn likes this.
  12. Mar 31, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Aug 3, 2003
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    Not a solex then... :p
     
    Glenn likes this.
  13. Apr 5, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    749
    The Carter came off a amc 6, ran great 3 years, started this acting up over night?
    Was never perfectly, but decent for a tractor motor ,lol.
    I have some past with solex, worked on air cooled vw for 15, years.
    For 80$, I can't go wrong, and need my cj, to be reliable for kids, and grand kids, to
    learn on?
    Hopefully, I can dial it in, and forget it?
    What's y-alls take on the solex?
    Thanks
     
  14. Apr 6, 2020
    scoutpilot

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
    Messages:
    428
    The way I'm reading this is you took a carburetor for a 6-cylinder motor and tried to make it work on a 4-cylinder motor?
     
  15. Apr 6, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    749
    Yes, and it worked decent for a while, with rejetting , and some tuning mods.
    Carb doesn't care how many cylinders it's feeding! It's a fuel and air mixer controlled by vacuum signal!
     
  16. Apr 6, 2020
    scoutpilot

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
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    428
    Your Jeep. Okay.
     
    ITLKSEZ likes this.
  17. Apr 6, 2020
    wheelsontheroof

    wheelsontheroof New Member

    dupont pa
    Joined:
    Apr 1, 2020
    Messages:
    37
    vacuum leaks arent always obvious. my 77 had a yf on it. i rebuilt it once in 20 years. did you try carb spray on intake and carb gaskets ? the fluid will monentarily cure the leak . i have been fooled more than once with vacuum leaks . it can be frustrating.
     
  18. Apr 6, 2020
    Greevesman

    Greevesman Member

    Napa, Ca
    Joined:
    Oct 12, 2014
    Messages:
    417
    And correct jetting. And bore size.
     
    ITLKSEZ likes this.
  19. Apr 7, 2020
    Uncle Vin

    Uncle Vin Member 2022 Sponsor

    Long Island, New...
    Joined:
    Sep 29, 2008
    Messages:
    348
    I'd obtain the correct Carter, then send it to Scout Pilot (see above) [Home | Old Jeep Carbs LLC] and be done. That's the best way to a reliable Jeep.
     
  20. Apr 10, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    749
    I may pull it apart again sometime? It ru s great, anything above idle?
    Surges, hunts, loads up at idle?
    Air screw was really sensitive before it started this, had to be turned just right
    Bout 1.5out to idle smooth. Now it's all way in, and still surges.
    In the middle of a 401 build for my j10 now, and don't want to waste time on this carb!
    Hopefully I can bolt the solex on and forget it a while? And concentrate on my j10?
     
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