Hi:<br /><br />I'm new to boating and I have to ask what may seem to experienced boaters a dumb question. I have asked different boaters and no one seem to be sure of the answer.<br /><br />I have recently purchased a boat and it is docked at a fresh water lake full time. My question, do I raise the outboard engine when I'm finished boating to get it out of the water, or do I let it remain in the water for some unknown reason and wind up with that green scum all over the bottom of the motor? It's a new Yamaha, four stroke, 25 HP outboard. The back of the motor faces a southern exposure. Is there any reason to leave it in the water? Most of the small boats, here at the dock, leave the motors down in the water when not in use.<br /><br />Any constructive thoughts would be welcomed.<br /><br />Thanks