What motor is that, SD? I just bought a 10.5 foot Portabote from a fellow here on Sailnet, and it's chained to my deck for the winter (unless we get a significant warm spell!).
I was considering getting the Honda 2.5 HP (29 lbs.) four-stroke, because of the simplicity of the air-cooling and the weight (which my compact wife could handle easily). But seven more pounds is not going to make a huge difference. This engine would be shared between a nesting
dinghy of the same length and the Porta-bote. It's anticipated that the Porta-bote would be the "cargo" tender, while the nesting
dinghy (an NN-10 that can be also rowed and sailed and is currently being shipped here) would be the people-mover/potential lifeboat.
That extra horse could be helpful. Either tender will handle 4 HP or under 50 lbs., but I want the best ratio of light vs. HP, and I would take slightly less HP in favour of mechanical reliability/ease of maintenance.