Johnson sea horse 50 hp 1983

Problem with my engine is the top cylinder is getting hot. Bottom one just gets warm, I have fitted a new water pump and water comes through the tale tale well and there is water coming out of mid section.water stays cool
The motor idles around the 800 to 900 rpm.
Could there be a blockage at the top of cylinder? Or t stat not working
Unfortunately there no engine number motor.
Any help would be appreciated
Dave

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