1994 50hp Force not peeing at full throttle?

[jadnmd]

My 50hp Force runs great but when I run it past 3/4 throttle, the engine quits peeing water and my heating alarm comes on in less than 5 minutes. I had a new water pump put on last year at the dealer and it did not help this problem at all. Also, the thermostat has been removed. Any advice is appreciated.

[WillyBWright]

It could be a blockage. Remove the gearcase and backflush thru the thermostat hole. Then put the gearcase back on and the thermostat back in. I think it's more likely that exhaust is forcing it's way into the pump. That'll happen if the seal on the pump housing is bad and/or if the housing is badly worn inside.