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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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