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Subject: Jets size

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Pete Landon    Posted 06-24-2020 at 20:06:22 [URL] [DELETE]        [Reply] [Email]  
  • Jets size
  • Where can you fi d the right jets for the 241b

    Tim Daley(MI)    Posted 06-25-2020 at 05:21:35 [URL] [DELETE]        [Reply] [Email]  
  • Re: Jets size
  • HiYa Pete-
    First, I highly advise NOT to try drilling out any carb passages especially with a hand held drill unit. If you break off the drill you will most likely not be able to burn it out. Are you having major carb issues or just doing some standard PM work? Granted it’s your tractor and you can do anything you wish on it, but this one of those things I’ve learned from experience. Having rebuilt several M/S TSX carbs and used the different models on my Fords (TSX 33, TSX 241) it only took me one time breaking a tap to seek a different approach. I remove carb from tractor, disassemble the two halves and remove gaskets, needle, and float. Place parts in a coffee can, fill with lacquer thinner, cover, and let set for a week or more – the longer the better. Carb cleaner use to work great but nowadays may or may not work. OSHA demands non-toxic substances to be used now. Remove parts and blow off with compressed air. Begin removing brass adjusting screws and all other screw-in parts. Set halves in sandblaster and clean inside and out. Place back in a coffee can with fresh lacquer thinner, mineral spirits, or 50/50 acetone mix, cover, and let stand for a week longer. Remove, blow dry, and begin inspecting ports. I use old guitar strings and pipe cleaners to chase passages, never any drill or reamer. The thinner will help dissolve old gummed up gas and I’ve had some units that if left setting for ten years or more can get plugged up with dirt. I use a telescoping inspection mirror and magnifying gas to inspect passages well. Cleansing with thinner, air blasts, and old guitar strings chased with pipe cleaners are all I use. Beginning in 1947 Marvel-Schebler began attaching a brass ID Tag with a rivet on the cast ‘ping-pong paddle’ of the carb body. It had the M/S carb ID number (ie TSX 241B), and the date code stamp when the unit was produced. FWIW & FYI: A 1,25 mm (metric) size is .0492” (inch) which is no doubt what the company used if indeed that passage was listed at .050" -they would NOT have made a special drill size just for that. A 3/64 drill ( .0469") would be standard and if used, would have been rounded off. Any tooling supply company sells drill size charts and drills. A #55 drill size = .052". Guitar strings come in Light, Medium, and Heavy gauge sets –see chart. I use 10/MED's on my Les Paul, heavy's on my acoustic. I have many old used strings if you want some. Pipe cleaners are sold at local tobacco shops. Also, there are a few OEM Marvel-Schebler documents in our HOW-TO’s to download for reference. I have a few OEM M/S carbs I’m rebuilding now. If you want, send me your unit and I can clean and rebuild or core exchange with your original as long as it hasn’t been drilled out.


    Tim Daley(MI)

    JMOR    Posted 06-25-2020 at 00:09:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Jets size
  •                American Wire Gauge #20AWG is 0.032 inch, but 0.73mm is 0.287 inch (0.032"=0.81mm). I caution that there are at least another half dozen wire gauge standards in the world, so ????
    Your numbers look like "happy numbers to me. I like the way they match my own notions/numbers I have come to accept. Real close match I say. Using pin gauges and calipers, there is probably always some doubt in the 3rd decimal place.
    Source Idle Econo Main
    My most orig 0.033 0.050 0.043 *
    My other 0.028 0.0625-0.073 0.040
    Don b (un-molested) 0.035 0.049 0.046 *
    GasPump 0.0465 0.037 0.052
    Bob Johnston 0.030 0.046 0.052 * (but no cupie doll)
    (has 4 carbs all same)
    "Distilled" range 0.030 to 0.040 0.040 to 0.060 0.040 to 0.050
    GB (MT) 0.032 0.046 0.043 * jets from "Just 8Ns",
    # 9N 9596 # 9N 9914 # 9N 9533
    Thanks, Gary.
    Every agreement adds to the confidence,
    -----Original Message-----
    From: Gary Berkey [mailto:slk2526@blackfoot.net]
    Sent: Tuesday, March 03, 2009 1:44 PM
    To: Jesse Morris
    Subject: My carb. jets measurments notes.

    Found them in the shop!!!
    Here are the #s I have written down.
    Idle ......part # 9N 9596....did not have a drill this small, but used a 20 ga. piece of stainless wire. !!?? Fits real snug.
    Econo.....part # 9N 9914... 0.046
    Main.....part # 9N 9533....0.042--0.043
    I have used these #'s on the last 3 carbs. I have overhauled, and have had real good results on all of them.
    I buy these carb. jets from "Just 8Ns", due to being able to get them in singles, with the part# on the label.
    I know that with this system, I cannot know what mod. M/S carb., it is jetted for, but It is my thought that, If they work good this way, with NO returns, and NO problems.......WHO really cares!!!???
    BTW: If you can tell me what the sizing would be for 20ga. wire.....let me know......LOL
    If I remember right the package the wire came in, had .73 MM, written on it, along side the 20 ga.
    Hope this helps.

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