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The latest project sitting in the garage is our 1937 John Deere model BO, the O designating it as being an Orchard model.
The motor was really stuck (both pistons rusted in the cylinders) when I got it. It took lots of heat, WD-40, and an 8000 pound bottle jack to pop the pistons loose. After honing the cylinders, replacing and grinding the valves, and installing new piston rings, it runs again. I also tightened up the rod bearings, rebuilt the magneto, and "hosed out" the crankcase to remove the 50 years' accumulation of gunk.
As you may have noticed, it is missing the hood and gas tank. But who needs that stuff (it's running off a 2 quart gas tank taped to the frame in this picture).