Hello fellow boaters, I just joined so I'm a complete newbie. I just bought a 15 ft 42 inch bottom boat with trolling motor and a mariner outboard. It has no HP ratings and I'm thinking its a 9.9 or 15 HP. The serial is oc129091 or the o could be a 0? Well I have really looked on lots of websites and I cant find it, either I'm complicating it or I'm just totally a DA. I bought the package with description engine doesn't run and guy was trying to recoupe some of his money. Well I did compression check, seemed ok. Took the chance on it. Got it home messed with it for 30 mins and the thing runs better the my truck. Lol. Sry for long description was just excited. Ty for any help and I apologize for beating a dead horse on serial numbers but I can't find it at all..... randall....