while fishing today, on a perfectly calm morning, we were trolling with the starboard motor running and had shut off the port motor, then all of a sudden port motor cylinder filled with lake water and wouldn't start until I pulled all 8 spark plugs, turned engine over and emptied the cylinders of water. Then reinstalled spark plugs and motor ran fine!!! Second time this has happened in 2 years....does anyone have any idea what may have caused this breakdown??