Hey guys its been a awhile since I have posted here. Anyway long story short. I finally rebuilt the powerhead its been about about 1.5 years since rebuilt. Hardest part was the needle bearings lol!!! I have been having overheat issues lately @ wot. Replaced impeller in spring ran fine for while. OK then started acting up about week ago. Checked thermostats which were replaced at rebuilt they are fine. Cleaned out pop it valve assembly it's fine. When I changed the impeller put new water pump housing on also and yes new gaskets and yes they were put on in the right order. Tail tail is strong when thermos reach operating temp but here is the kicker when I am @ wot I I understand that the poppet valve on lower starboard side of motor cracks open to give additional cooling. But for some reason @ wot the tail tail starts spitting and stops and steam starts coming out instead of water. Checked all water lines they are clear. I run in river all the time. Any help should I pull bottom end again or you guys have any other idea. Also I can run motor all day at 1/2 or a little more with no issues. I AM STUMPED. Any help..?