I'm getting an overheat alarm on my XR6 when running at speed. Water pressure is good and I'm getting a good stream out of the hole. I'm not sure about motor height, but it is not set high on the jackplate. Any ideas beside the obvious water pump impeller that may be causing this? It doesn't do it all the time, and when it does, I can kill it and alarm will stop after I let it sit for about 30 seconds.