I have a 12 foot porta bote and my 3 1/2 hp Tohatsu, although an excellent motor, is too slow for that boat with 2 adults and a 6 year old. The new 4 strokes cost around $1,200. I have found a left over 2005 Mercury (read Tohatsu) 5 hp on e-bay that is about 10 pounds lighter than the 4...