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When we were taking the engine apart, we discovered the spark plug for that cylinder was loose, so we theorize that the plug was not grounded correctly, causing the spark to go to the piston. (The hole is in the dead center, shaped very similar to the end of the spark plug.) Trying to avoid having amother hole in a new piston, so an Ideas on what caused this are appreciated. We will go through the carb to see if things are as they should be.
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