I am looking at getting an newer boat a 2005 nitro 640LX. It has a 2005 Mercury 2 stoke 50hp. Now I know that 50hp is 50hp regardless of its 2 or 4 stroke but are 2005 2 strokes good motors. I currently have a 2005 25hp 4stroke on my small 15ftboat and it does fine its not a speed demon but I...