My brother is looking to power a new "Porta-boat" he has ordered. He would like to get a four-stroke to be "environmentally conscience" and anticipate any restrictions in the small waters he will be navigating. He is considering the Honda 2hp four-stroke and the Yamaha 2.5hp four-stroke. The differences between the two primarily being make, obviously, weight of about 10 lbs, and the Honda is "forced-air cooled" and the Yamaha is water cooled (which probably accounts for the added weight). Both are well under the maximum motor weight the boat is rated for. Which one would you recommend? Is the added weight of the Yamaha worth going to a water-cooled outboard and half an hp more? Is a water-cooled outboard more preferable or does it simply add unnecessary complexity? Any thoughts on the subject would be appreciated! Thanks!