The rev limiter on the HO is 5150 rpm.

ran the boat yesterday half tank of fuel, 2 adults everything back inside, still hit the limiter with throttle left, what about a hydromotive prop

they like Hydromotives, I have a worked 27 on mine and a stock 27 as a spare, I could use way more prop with the new power, but I like the slip factor so i am not working the XR too hard.