Hi, i have a 14' xpress john boat and a 15 hp yamaha four stroke, let me tell you that i bought one of the first yamaha's that came out in four stroke and the first one burt up on me, and the second one i still have but i hate, they were both hard to get started and if you started then stopped it for a long time you had the same trouble again, take it from me go with a two stroke, as for the boat i love it, i would buy another in a heartbeat hope this helps.