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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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