I sank a boat in February 2002 it stayed under for 3 weeks, water was fairly clean at the time of the sinking, but we recovered it and it is running great today. I bought a gallon of WD40 (the WD stands for Water Displacement 40th formula) and just poured it through as I cranked it with the spark plugs out until I was certain all the water that could come out had come out. Put clean fuel in it and it fired right up, I let it run a long time and that's all I had to do. In my case the back of the boat went down first and the boat stayed with the nose up until I recovered it. That let air get trapped in the motor portion of the trolling motor. So when I turned the trolling motor up to drain any water out of it there basically wasn't any it. The trolling motor has never given me any issues since either. I'm glad it happened this time of the year for you instead of when it was 40 degrees out and the water was 43 degrees as it was in my case, because you would have never made it 300 yards or even 50 yards. It's a long story but it was only by the grace of our Lord that my friend and I survived. Apart from Him there was no one around to help us.