I would start in the carb. A lean condition will pop and backfire through the carb. Your comment about the choke is a tell tale sign that its fuel or the lack of. You might see some grey or light smoke running lean, but it will be black when its too rich. Run the fuel out of the carb and allow the unit to cool. Then you can try a can of gumout carb cleaner, take off the pipe plug on the side of the bowl housing and spray in the carb cleaner until the bowl is full. Replace the plug and turn on the fuel. This will run some of the cleaner into the passages and may clear out whats in there. You may still need to tear it down, but its a start on diagnostics.
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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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