I am considering purchasing an early 90's 4hp Yamaha to put on a 7.5' Bombard AX2 Inflatable w/ inflatable floor. The boat weighs 28lbs., and the motor weighs ? lbs. How do I know if the boat will plane with me (175lbs) in it? Years ago I had a small Achilles w/ wooden floor boards and a 5hp Mercury that planed when I was a little lighter (160lbs), but I am not sure that the Yami has enough thrust to plane the AX2.