I just came into a Mercury 20HP this afternoon and I can't determine the year ... unlike most others, there's no year on the ID plate ... just a serial 5765766.<br /><br />The engine looks as though it's barely had any use and starts on the first pull, but, so far, all I can locate is a range from 81 through 88 and, looking at the engine, I find that hard to believe.<br /><br />Any help IDing this engine will be appreciated ...