I fought a similar problem for a long time on my 1939 A. The problem turned out to be a restriction in the intake manifold. I bought it with a stuck engine, and put new sleeves & pistons in and completely rebuilt the motor, but it always seemed to run bad under load, like it was missing on a cylinder. It would start on two cranks and idle great, but when advancing the throttle, it would 'putt-putt' like a 2 cyl. John Deere. Switched carb and mag with my nice running B, made no difference. Checked timing, valve clearnace, etc. many times; still ran bad.
This spring I took the carb off to clean it when it flooded, and I put my finger in the intake to see if it was wet from gas. That's when I noticed the passages felt restricted. I took the manifold off and found that were the passages branch out above the carb were restricted down to about 3/8" or 1/2" hole, and they should be about 1". I couldn't get the stuff out of the manifold, even by sandblasting. It almost looked like casting slag. I bought a new manifold for $100 on eBay, and the tractor runs great now.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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