AQ125A iddles cool at 140 but overheats at high speed or RPM. I have replaced the following: water pump rebuild, water strainer housing, and the piece that connects the hose to the 270 outdrive. When I hooked up the muffs to it and run it at iddle speed it runs at 140 degrees all day long w/ no problem. I see water coming out from the outdrive exhaust and the water feels warm. When I took it out to the ocean same thing. But when a I go fast (35 MPH) it heats up to 260 degrees. Please help troubleshoot.