I have a 6.5 Ribcraft with a Honda 150. With two on board and 40 or so gals. of gas, I get 42-43 kts at wot. By the way, to Colin, I didn't know that honda sells a 175 hp. It's not sold over here.
Thanks guys need to go down and check what prop we have. Still running the engine in and was a little concerned about the speed as we were only running about 22kts at about 4000 rpm, but i guess (hope!) all the power will be at the end!