Evinrude overheating, weird issue

[Curapa]

Ferm, the 10 mile run is cruising around 4k all the way. Once I cool it down I can run the rest of the day without it happening again. I even ran it wide open for a while on the way back in yesterday without a problem.

The impeller was changed last year, seems to be the same pressure exiting the engine. I will drop the foot to check it out when I get a chance, it only takes 15 minutes but it hot outside!