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 Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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