M\S Carb Wrong Main Jet?? -- CA

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   Working to sort the fuel issue out on the CA ( I have a couple of post about it), I have ruled out fuel supply as I have test tank and new line.  

Someone mentioned that my main jet could be plugged or the wrong one...

TSX154 M/S this is the main Jet/Nozzle in the carb it insn't plugged but looks different then the replacement ones

Below is an image from OKtractors of the TSX154 Jet.... I have assumed that this is a picture of the actual part

Comparing the images the nozzle that I have has a smaller tube and more holes compared to the OK tractors one. Mine appears to be the same diameter as the OK tractor one where it is steps down in size at the bottom.

Do I just have an older version or do I have the wrong jet..... (hard to believe it could be the wrong one, but this tractor has a few special tweaks from the previous owner)

Could someone confirm which jet is correct for CA... Thanks!!!!

Edited by Turbo_760 - 06 Jan 2012 at 8:32pm

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Turbo_760 Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 04 Dec 2011 Points: 92	Post Options Post Reply Quote Turbo_760 Report Post Thanks(0) Quote Reply Topic: M\S Carb Wrong Main Jet?? -- CA Posted: 06 Jan 2012 at 8:32pm
	Working to sort the fuel issue out on the CA ( I have a couple of post about it), I have ruled out fuel supply as I have test tank and new line. Someone mentioned that my main jet could be plugged or the wrong one... TSX154 M/S this is the main Jet/Nozzle in the carb it insn't plugged but looks different then the replacement ones Below is an image from OKtractors of the TSX154 Jet.... I have assumed that this is a picture of the actual part Comparing the images the nozzle that I have has a smaller tube and more holes compared to the OK tractors one. Mine appears to be the same diameter as the OK tractor one where it is steps down in size at the bottom. Do I just have an older version or do I have the wrong jet..... (hard to believe it could be the wrong one, but this tractor has a few special tweaks from the previous owner) Could someone confirm which jet is correct for CA... Thanks!!!! Edited by Turbo_760 - 06 Jan 2012 at 8:32pm
	1951 CA Cub Cadet 149

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Chalmersbob Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 11 Sep 2009 Location: Pennsylvania Points: 2122	Post Options Post Reply Quote Chalmersbob Report Post Thanks(0) Quote Reply Posted: 06 Jan 2012 at 9:39pm
	That is not the main jet. It is the discharge nozzle. But it should have the same holes as the example. They may be blocked The main jet is at the bottom of the carb. Remove the drain plug and look inside there. The main jet gets removed with a screwdriver. Bob

Turbo_760 Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 04 Dec 2011 Points: 92	Post Options Post Reply Quote Turbo_760 Report Post Thanks(0) Quote Reply Posted: 06 Jan 2012 at 10:41pm
	Alright.. I think I need a little more help understanding this carb This is a picture of the bottom of the bowl. #1 is the drain plug and that leads to 2 small passage at the bottom of each half the bowl #2 this is a plug which if I remove it goes right into the discharge tube... I found this filled with black sludge, after cleaning it out I can see all the way through the carb This is a picture of the top side of the carb #3 Is this the main jet? I have removed this and cleaned it out good #4 this is were the discharge tube goes. There doesn't appear to be any orfices in here, just some sludge and this connect to the small brass plug in the pic above (labeled #2) #5 this little passge is the drain and connect to the drain plug below. Do my assumption above seem correct? I think that I have now found the main jet
	1951 CA Cub Cadet 149

Soilguy Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 10 Jul 2011 Location: Weslaco, TX Points: 32	Post Options Post Reply Quote Soilguy Report Post Thanks(0) Quote Reply Posted: 07 Jan 2012 at 9:11am
	You might look at the website below. It's written for Ford tractors, but I've found the sections on carburetors very helpful. It covers the anatomy of both Marvel Schebler and Zenith carburetors, and the adjustment section was a life-saver for me last year. Just a suggestion. Good luck, Larry www.myfordtractors.com

Dick L Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Edon Ohio Points: 5087	Post Options Post Reply Quote Dick L Report Post Thanks(0) Quote Reply Posted: 07 Jan 2012 at 4:17pm
	Number 3 would be the main jet on that carburetor. If you had the adjustable type the needle would screw into the top of the carburetor and the point would go thru the hole above the #3 jet to close it down or open it up. Different jet though than what you have now. I have a set of wire drill bits and when I boost the air flow thru a built up engine I open the hole in the jets. When I do this I do not enlarge the hole very much before I try it out under load. I use a pin vise to hold the drill and open them up by hand.

Steve in NJ Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Andover, NJ Points: 11926	Post Options Post Reply Quote Steve in NJ Report Post Thanks(0) Quote Reply Posted: 07 Jan 2012 at 8:02pm
	Small bore Marvels like that one have a "fixed" main jet in them. Large bore M/S carbs have an adjustable enrichment circuit in them. If you're still finding debris in that carb, it problably still has debris in it yet. If there's a machine shop near by, the best thing you could do is drop it off and have them glassbead the inside of that carb like I do when I rebuild em' for our customer's, and get all the crap out of it. Nothin' like glassbeading them old dudes to get the muck out of em'. The discharge nozzle you're comparing to may not be the correct replacement for that carb, but in most cases, replacement carb parts may not look identical either, but still do the same job. It has to do with patents and such... Steve@B&B