Whelp my jet assembly separated while taking the carb apart, P/N 5F7640, and I'm looking for another one (or a whole carb/throttle body). I didn't realize it was 2 parts, but the needle was stuck in the throttle body and the threaded section spun out - it's just a heavy press fit between the needle and threaded base. My backup plan is to try and fabricate one using some .093 x .014 wall brass tube. Anyone out here have a carb they're willing to sell? If not I'll buy parts - I also need a new choke plate shaft, P/N 9B4977 I believe. The screws sheared off when trying to remove them after melting the solder, I may not have gotten the backside hot enough. I can try to drill out the fasteners, but it would be easy to just turn a new part if I can't find a replacement.

If anyone has a jet assembly laying around but not wanting to sell, I could really use a dimension check on the dimensions labeled "A", "B", and "C" on the attached PDF.  

Thanks!
Proud owner of a 1942 D4 7U
 

Hi dirtbiker 1824,
have you tried Cat as they still have them in stock as I brought some earlier this year.

 

regards

5F7640 $27.73 U.S.

www.machinerytrader.com/parts/search?Sea...rt&PartNumber=5f7622
www.machinerytrader.com/parts/search?Sea...rt&PartNumber=5f7623
www.machinerytrader.com/parts/search?Sea...rt&PartNumber=5f7640

Try McDonald Carburetor. they also have other parts and gasket sets

Zenith TU idle jet C51-2-10 C51-2-11



Zenith TU idle jet C51-2-10 C51-2-11
Our Price: $16.40


Availability:: Usually Ships in 24 Hours
Product Code: C51-2-

Squatch253 & Senior did an excellent job of videoing a rebuild on a Zenith Carb
Caterpillar D2/D4 & John Deere Pony Motor Carburetor Rebuild, 5 parts
A MUST SEE if you are going to work on this type of Carb.

.......... part 5
.... part 4
.......... part 3
.... part 2
.......... part 1

Thank you all. I did watch that series and Sr. said that those needles were very hard to come by so I didn't even bother to check CAT. I also didn't know machinery trader sold parts like this.

I got several from mcdonald.
My jet assembly problem with bowl stuck on it video.