My 718cc stock ported 61x cylinder freekin rips buddy, you don't need more than that, and it will last a long time.I have never been on a sxr, but I plan on it real soon, Tanner and his buddies have been riding the last couple of weekend's in saltwater I have been in the 16' lund lol too damm cold for me. We are waiting for the lake to thaw still can't even get to it other than by snowmobile .Good luck with the new boat I love Kawisaki but I am going to build that RN I got from the Crab as a freestyle boat I have no doubt I will love it.