Water in the engine causes rust. That alone will cause a valve stem to seize inside the guide. Get that moisture out of your engine. Drain the crankcase and refill but, leave 1 qt. low. Then add a qt. of Motor flush such as Rislon to the crankcase. Start the engine and get it up to operating temp and let it run awhile. Then drain the crankcase again and change the oil and install a new filter. Then at least once a month or so/ or more start the engine and let it run for awhile. Also check the rest of the fluids for water. Sitting unused in an unheated building with constant changing temps are causing your problem. If all the valves are adjusted correctly and the engine is running quietly then, i think you have enough lubrication to your valve train.
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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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