If it's any consolation, I have an H that's doing the same thing. Just doesn't run as smooth as it should.
I've done just about everything you have, except pull the head, either replacing parts or borrowing parts from another H that does run like it should. I did check the valve lash.
A buddy of mine suggested a vacuum leak about the same time I thought of it. I've ordered new manifold gaskets from YT, so that's my next step. I may go ahead and pull the manifold this afternoon to see what I can see.
The odd thing is, it sat outside for several months over winter, and when I went to move it a week or so ago it started right up and ran fine for several minutes before it went back to its old ways. Could dirt have temporarily plugged a manifold gasket leak?
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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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