(800) 853-2651
SHOP NOW

Darn Cub Carb

F

Farmallb

Well-known Member
I have to have the choke 1/2 way open for it to run, then have to fine tune the choke lever to get the best run out of it. It has finally flooded out the 2 center plugs, Any ideas?
 
In addition to what Jim has stated, the Cub carb is one of the simplest ones, BUT it is also the one that has given me the most trouble over the years (The F-12 carb is running a close 2nd).

IMHO, they are VERY suseptable to dirt and internal corrosion. However, when they are right, they run like a champ (also like the F-12). If you have not thoroughly cleaned out the carb in a rebuild, I would do that next IF you have ruled out a manifold leak.
 
If you do open the carb and are unfamiliar with the Cub carburetor, when you take out the fasteners that hold the two halves together remove the top from the bottom by lifting straight up. There is a small tube that can be broken off easily. It is threaded into one half and extends into the other. Clear the tube and you are good to go. This is a fussy little carb but I had very good luck with mine.
 
With the carb bolted up as normal, and the breather tube installed, crank the tractor up, then adjust the choke to get it to run decent. Then spray some ether/carb cleaner on the outside of the carb, in quick shots to see if you have a leak. If you do, the engine will rev up with the introduction of more fuel. Could be the manifold gasket or the felt around the throttle shaft.
 
They crack between the exhaust passages and the intake runners. Usually in the center below the muffler hole. Tough to analyze while it is on the engine. Jim
 
You must log in or register to reply here.

Similar threads

T
Stumped on M Tuning
Replies
14
Views
636
560Dennis
560Dennis
D
1963 Ford 4000 Gas carburetor trouble. Any suggestions??
2
Replies
27
Views
755
DLPinnix78
D
W
Farmall A hard starting - fueling issue
Replies
14
Views
624
C.Amick
C
P
Good place for Cub parts?
Replies
7
Views
346
Poonie
P
J
International 574 issue running in run position
Replies
11
Views
377
Dieseltech
D
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top