I do 2 things when a problem like this occurs. 1 I use a wall scanner and insert into spark plug hole. I can usually determine the condition of the piston and cylinder walls this way. A wall scanner is used by carpenters to check for wires or plumming in walls. 2 I make or buy a tool so I can blow compressed air into the cylinder. This will determine the condition of the valves. Rotate to tdc when both valves are closed. When adding the air it may spin the motor over to bdc, but that's ok. Just be careful when doing so. If air blows out exhaust, then exhaust valve is bad, if thru the carb, then intake is bad.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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