The little nipple visible in your third photo originally supplied air that had passed through the air filter to the "choke stove" in the exhaust crossover passage in the intake manifold.
Since you now have a carb with an electric choke, the nipple isn't needed or used and can be capped off.
In addition to possible accelerator pump issues that have already been mentioned, there's a little "dogleg" latch lever on the RH side of the carb between the choke mechanism and the carb that is supposed to latch the secondary throttle plates closed until the choke is fully off and the engine (hopefully) is warmed up a bit.
If this little lever is stuck, missing, or misadjusted and the secondaries can open with a cold engine, it will act EXACTLY as you describe.
Also, the (rather hidden) secondary "airvalve spring windup" setting on the torsion spring at the RH end of the secondary air valve is CRITICAL in getting the carburetor to operate properly.
If too tight, the secondaries won't open as they should, if too loose, the secondaries will open to0 early and too much causing a "bog" or "stumble".
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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. [ About Us ]
Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
... [Read Article]
Latest Ad:
Late 50s early 60s international harvester 560 with cultivator
[More Ads]
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.
