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The last time I saw that it was a dropped exhaust valve head that turned sideways and shut down the engine quick. There was no rev down. He was buzzing along then immediate silence. The valve head was embedded in the piston. When we sorted it out after cooling, we tried to start it and nothing. It made no funny noises or anything. Sounded just like it was out of fuel when we tried to start it. I could see the valve in the piston by rotating the engine with the kickstart and looking down the plug hole. My eyes were better 25 years ago.
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