I had a 429 rampage with a yamaha cv30. Plenty of power. I towed tubes, fished, cruzed. But yeah it was thirsty and noisy and was a shit to start most of the time. Surely a 40hp 4 banger with the right prop would be adequate. Or go for an etec 30hp? Maintenamce on a 2stroke is dead simple and cheap. 4 stroke a bit more in depth for the average dude. My boat was stable as can be and i would carry 4 fat dudes no probs with 30hp of two stroke fury.