Help with 1989 Mercury 25hp

[Dspur79]

I have an older 1989 Mercury 25hp 2 stroke that I just got back from the shop. New stator new trigger new coils new spark plugs and all new linkages. The problem is my motor pee stream is very good but last time I was out the midsection is getting very very hot. Evaporates any water that hits it after I ran it. And also it was running great just don't wanna run it with it heating up like that

 

[Dspur79]

Also no t stat in motor was told I don't need one in Florida. I only run in freshwater and last thing that was done to motor was bolts on t stat broke so had them drilled and fixed I'm at a loss on knowing what to do next. Thinking a clog somewhere or somehow water isn't getting to all parts of motor