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Propably however, it would have to be very blown for water to be sitting in a cylinder. Something must have been wrong for a long time if that was the case. You can see here my old motor when I blew the head gasket. It was just a tiny crack. I could tell something was up as the boat was very slow to plane and gain power. Put it on the trailer and pulled the plugs. I found one that was perfectly clean and that was a dead give away. Pulled the heads to find the crack and a scuffed cylinder wall and cracked ring from overheating. No water in the cylinder though because it had been turned to stream (thus cleaning the plug). This is why I would be surprised that there would still be water in your cylinder. Are you sure the motor was fine last week?