I have a boat in my backyard that has been sitting for a while and I think the Engine may be worth more than the boat itself (the boat is a hunk of junk). I know nothing about boats and wondered how much my engine was worth (a guy recently offered me $500 for it) and what year and model it is so I can try to get it running if I decide to. It says Mercury Powertrim 1150 115 HP on it and it has the SN: 4396087. Thanks for any help.