I have an '03 Lund 1700 ProSport that came packaged with a 90hp Merc 2 stroke carbed. Rating for the boat is 115hp. %78. The boat pops right up and rides at 39-40mph with two adults. I am satisfied with this. I just got it so I don't know yet how it will respond with a skier( a definite possibility with my teeenage son). <br /><br />Should I look to upgrade to 100, 115hp 2 stroke or four, and what is my best window for trading a used motor to a new or another late model i.e should I consider this while my present motor is still relatively new or should I get a couple good years out of it and then look to power up as the boy grows? Thanks guys, I value the opinions I hear on this site!