Can anyone identify what model Marvel Schebler carb this is? Currently on 49 8N

Thanks, Tim

Back with the carb change S/N's. Yours looks tlie a TSX-241? but can't be sure. The original TSX-33 would have a large thumb nut in the main adjusting needle with a spring tension clamp to keep it from moving and those parts are not visable in your photo. Since the TSX-241B superceded all other N carbs it would be correct on any N.
Original carbs:
TSX-33 To #260596
TSX-241 To 276115
TSX-241A To 313112
TSX-241B To 313112 up
TSX-241C Used on early 1952 production, cheaper construction, had no econo jet
but was superceded by 241B that eventually also superceded all others.

The little pin in the center of the paddle is a giveaway that you have a TSX 241 with the brass tag missing. Whether it is a TSX 241, 241A or 241B is anybody's guess.

I have made several posts on the subject of N series carbs. I have rebuilt five of them in the last year and I am trying to keep careful notes on each. Basic conclusions:

I have rebuilt TSX 33's, a TSX 241 and a TSX 241B. I have sized the jets and the only difference in the whole bunch is that the TSX 241B has a noticeably bigger IDLE jet.

If you buy the TISCO or Tractor Supply kit the jets are all supposed to be upgraded to the TSX 241B spec. In practice I found that the jets in the kit are the same as the TSX 33 or the TSX 241, but not the TSX 241B (idle jet is different).

My early 8N is now running a TSX 33 (rebuilt). In practice I cannot get the idle rich enough to eliminate the popcorn sound. I am going to try reaming out the jet slightly to make the mixture richer. Basically, I will be converting the jet to TSX 241B specs.

It's hard to tell with these carbs - you never know how many rebuilds thay have been through, or who messed with them. I had TWO with the choke flapper installed wrong. Only two had the original butterfly valve without the rubber tip.

I hesitate to post the jet sizes because the info is downstairs and it is late. Will post tomorrow.

You mentioned "original Butterfly valve without the rubber tip" Not sure what you are speaking of there. The TSX-33 could have been rebuilt by a licensed rebuilder to any other spec so an original TSX-33 bowl could end up on another such as the TSX-241B. New as well rebuilt carbs of most models were sold in the 1950's, even after the superceding by the TSX-241B occured you could still order new or rebuilt TSX-33's, but no telling what was in them. The huge difference and the most important is that the original TSX-33's had a very small economiser jet, between .021 and .031, it easily plugged and made the tractor run very poorly. I have posted the correct TSX-241B jet sizes but nowdays you can by or get jets in most any size. I like the correct TSX-241B sizes, they work for me. Main=.052, Econo=.037 and Idle=.0465. The Main Fuel Nozzle is important too but I don't recall actually measuring openings in one, I just compare new to known good ones and nozzles you can buy nowdays, like jets are all over the scale. Lastly some argue that an Idle of .0465 is too large and I say to them I found it will work fine if its under .040, elevation and fuel may matter here too, don't know. I have seen at least 4 N's with 241's without a main jet and they ran! Rebuilt my BIL's 8N TSX-241B after he had two service calls plus springing for a brand new carb to get it to run right, the local carb expert left the main jet out at least twice and charged a bundle 3 times. That error likely comes from the later NAA and up carbs that used no main and relied solely on the Main Fuel Nozzle.

Thanks so much for the reply--I have been following your carb posts for the past few weeks now and am understanding some of the frustration you are having...the tractor that I just finished up on TONITE (I am celebrating) was one that I thought was all original except for the bumper and the wheels that I put on it. If original, it should have a TSX 33 on it. I don't think it is----that is frustrating---I believe I am the second owner which I feel is kind of special---there is probably other items that I have missed that are not original.

I am still happy with the results of my work---not perfect, but I am still a newbie of 3 years on the N's----still looking for the perfect 100% all original!!

Tim

Tim-
It's a Marvel/Schebler Model TSX-241-B most likely. Do you see that little brass tag riveted on the "ping-pong paddle" boss on the front side there? There should be a model number stamped on it. You can do an archive search here or on the History forum and get more info on the differences between the A, B, and C models.

Tim Daley(MI)

Tim----that was my guess---the 49's were supposed to come from the factory with the TSX 33, so would you agree that this carb is NOT the original?

Thanks, Tim

Whoa there cowboy...I may have spoke too soon. Your carb appears to be a TSX33 based on the Marvel-Schebler logo in raised script on the lower base half, but I can't tell by the paddle boss if there is anything there. My 9N carb has "TSX33" in recessed cast letters on the paddle. My 8N has the TSX241-B carb, with M/S logo on the upper side of the cast housing, evidently replaced by the original owner at some point. Now, I have a Service Bulletin that states the new carb ass'y, p/n 8N-9914, TSX 241, without economizer jet, was put into production at serial number 252845 in January 1950. I'm sure Kelly or Don can chime in here with more accurate information.

Tim Daley(MI)

Tim---I just got home and looked to see if there is any kind of tag on the "paddle" and there wasn't. Without taking the carb off, the only marking on that carb are the ones you see in the picture.

The paddle does have the little screw in it that I am guessing held the tag that could have been on it. There is definitely nothing stamped in the metal at that spot either.

There are a few other things on this 49N that I cannot seem to figure on either. The axle on the right side does not have any slots in it for the axle nut clip to slip in either. It takes a regular size 2" nut, so it could not have been reground and re-threaded to a smaller size. The other side is normal. There is no dirt, crud that filled it either, because I took the paint off during the refurbishing process and it is a solid axle.

Thanks, Tim