I have a 1985 Bayliner bowrider with 85hp Force o/b. It has the big black fin on the motor to help get up on plane. Everything seems fine, but my question is: Did they come from the factory with that fin on it? In the last 2 weeks or so I came across 2 boats exactly like mine for sale in peoples yards. I stopped to check them out & saw the exact same fin on the motor. I can only assume that it had to be a factory thing. Just wondering......