I have an old Ted Williams 7.5 hp engine. I bought it used last year, and although loud, it has worked flawlessly, until this summer. I had it out overnight in a small rowboat/jonboat. The next morning, it had rained and there was water in the boat. I turned the whole boat upside down (engine still on the boat), and when i turned it back over, i couldn't get it started again. I know the owners manual said not to do it, but obviously I didn't read that until afterwards. Does anyone know what the problem could be? I have tried to get a spark with a new plug, but it might not be that. Please help with any diagnostic you may have.