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Re-jet Carburetor For High Altitude?

Discussion in 'Early CJ5 and CJ6 Tech' started by Buildflycrash, Jun 15, 2020.

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  1. mickeykelley

    mickeykelley Well-Known Member

    I’ve posted this before about the YF. The guy below bought all the Carter stuff when they closed up. He can make whatever rod you want. I had him make me a plus 1 and plus 2 lean for when I move to Colorado. Not that expensive. Call him. THE CARBURETOR SHOP / Company History
     
    mickeykelley, Jun 16, 2020
    #21
    Glenn likes this.
  2. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Black after idling either means nothing (on choke) or idle mixture too rich. That's separate from the main jets.

    Run it up the highway a few miles and back. Then pull the plugs and look at them, without extended idling.
     
    timgr, Jun 17, 2020
    #22
  3. John Gedde

    John Gedde Been around the block once or twice...

    The trick is to work CLEAN.... The float can be tricky, but if it overflows it's too low, if you can't get the idle mixture set or it runs out of oomph at WOT, it's too high.

    John
     
    John Gedde, Jun 17, 2020
    #23
  4. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    your just trying to confuse me more.
     
    Buildflycrash, Jun 17, 2020
    #24
  5. 45es

    45es Active Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Buildflycrash, I would bet dollars to donuts that if you showed up a day or two early, had the recommended parts in hand AND proper adult beverages, someone would help you with the change of jets. But then, what do I know?
     
    45es, Jun 17, 2020
    #25
  6. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    I’ll be a couple weeks early. And definitely will be seeing some folks. Just hoping to have this done and learn something new along the way.
     
    Buildflycrash, Jun 18, 2020
    #26
  7. colojeepguy

    colojeepguy Colorado Springs

    I'm not sure if I'm going to make the trip now :( but if you make it to Colorado Springs I'd be happy to throw some jets in your carb.
     
    colojeepguy, Jun 18, 2020
    #27
  8. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    What?

    I’ll be in the area for sure to pick up some stuff from Warlock. Not sure if it’s going to be before or on the way home.

    I’m just going to open her up and do the swap. If I screw something up I’m sure y’all will help me fix it. :beer: To ECJ5
     
    Buildflycrash, Jun 18, 2020
    #28
    Muzikp likes this.
  9. colojeepguy

    colojeepguy Colorado Springs

    Strained my back cutting a tree down...right now I can barely push in the clutch pedal. For now I'm in "wait and see " mode....
     
    colojeepguy, Jun 18, 2020
    #29
  10. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Two Ibuprofen 4X a day until inflammation goes down. Takes two or three days.
    You help with Jeep, I'll help ya get old.
     
    Buildflycrash, Jun 18, 2020
    #30
    Muzikp, colojeepguy and jpflat2a like this.
  11. BobH

    BobH Member

    We had prescription 800mg ibuprofen that was great!! Now I’m on blood thinners and can’t take it anymore.
     
    BobH, Jun 18, 2020
    #31
  12. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    I can barely drive my clutches right now for the same reason - the oar rig trip had hellacious upriver winds and pulling against them on the last morning, I tweaked my back. Loading everything from the rig to the truck finished it off and then a 4+ hour drive home. I've been 'managing' a bad back for the last 5 years - think it was injured in a skiing accident, but it was truly finished off when changing a flat tire on my truck and I lifted the tire into the tuck bed - never been the same. Hate to say it, but stretching and my wife's core focused exercise classes like Yoga, pilates, eccentrics really do help - but as soon as I stop and get lazy doing them (such as the last couple months), I do something that brings it back. The good news, usually it takes a week or so for things to come around that I can move without constant pain, and within a month I am usually pretty much back to normal. In my case, only muscular issues, no slipped or herniated disks - that gets a bit more serious. Hope you are feeling better soon...Yesterday was a rough one here, but today I can at least sit at the computer for a bit without too much pain.
    FWIW - I run 47 jets in the R2g in my 225. Even here in Denver, the officially listed 49s were too fuel rich for most all the driving it does is above 8,000' . If I ever get the exhaust flowing a bit better, I think I can drop down to 48s as a good compromise between Denver and high passes, but the 47s work well up high and while the trails here are quite easy (say compared to the Rubicon), there is an added pucker factor on steep, shelf road switchbacks when the carb starts getting grumpy. A few years ago when Mike passed through on his epic western road trip in the cj5 from Indiana, we changed the jets in a roadside parking spot in about 10 min and then had beer and pizza. My biggest concern was dropping one of the little linkage clips and not being able to find it on the street. Sure some of us would be happy to help you out with it if needed.
     
    FinoCJ, Jun 18, 2020
    #32
    colojeepguy and Buildflycrash like this.
  13. Warloch

    Warloch Did you say Flattie??? Staff Member

    I really don't want to remember the number of times I've changed jets and float level on the trail... Did I mention that I really love my EFI :clap:

    And yes - it will take me 15 mins to teach you how to change jets here at the shop out back.
     
    Warloch, Jun 18, 2020
    #33
    Buildflycrash, Glenn and FinoCJ like this.
  14. SoFla8300

    SoFla8300 Member

    I just rebuilt my YF with parts from Mike's Carburetors. Haven't done that in a loooong time. He has some great videos and he does a 4 part video on a YFA which is essentially the same, small differences. (assuming you have a YF or YFA)

    If you are mechanically inclined enough to keep an old Jeep running you can rebuild the carb.
     
    Last edited: Jun 21, 2020
    SoFla8300, Jun 21, 2020
    #34
    Buildflycrash likes this.
  15. SoCalNickG

    SoCalNickG Member 2023 Sponsor 2022 Sponsor

    I am following this thread with intention of having my Jeep ready for the Colorado trip. I drove the Jeep last weekend. I got the engine up to temp (went on a 1/2 hour drive), drove relatively hard then coasted into driveway and shut it down. I pulled the forward plug from each bank. Carb was cleaned recently (had it done). Here are pictures of the plugs.
    AB1tRgihQkedm9pfj7VdaA
    8UzZ6Gh+SOytHPlhQEsM1g
    What are these plugs saying? Too lean? Carb is jetted how it was when i purchased it. P.O. used in California/ Nevada Sierra's from what i was told. I live in So. Cal. driving around L.A. basin.
     
    SoCalNickG, Jun 30, 2020
    #35
  16. Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor


    I'm no expert but those look perfect to me.

    I received the jets this week from Mikes Carbs. Hope to switch in the 49 jets in the next couple days.
     
    Buildflycrash, Jun 30, 2020
    #36
  17. jpflat2a

    jpflat2a what's that noise?

    Spark plugs look good. Are they new ? Sometimes hard to tell with new spark plugs.

    Only way to know the jetting is to remove one and read the number.
     
    jpflat2a, Jun 30, 2020
    #37
  18. Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    I just got mine too. Will be putting them in before heading to Colo.
     
    Fireball, Jun 30, 2020
    #38
  19. SoCalNickG

    SoCalNickG Member 2023 Sponsor 2022 Sponsor

     
    SoCalNickG, Jun 30, 2020
    #39
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