Can anybody help me ID this motor? It's claimed to be a 1989 15hp. Looks like a Yammie.....I thought all the Mariner 15's from '89 vintage were Mercury's?? Big question is: What years did Mariner sell 15's made by Yamaha.....could it really be an '89? I don't want to get scammed here and I'm going to have to drive 3 hours just to get a good look at it.