hallo and happy new year: on a water cooled boat engine (cmb 90 evo) how can I determine if the amount of cooling is good? my "agricultural" method is: I run full throttle the boat for 3 minutes and if I can hold my hand on the waterjaket these means too much cooling and I reduce the water flow on the water line with a tie wrap ,if i can not keep my hand on the w/j is ok, if the w/j is do hot that i can not touch it I increase the water flow .I am shure tath exists better ways to determine how much cooling is needed . running a overcooled engine ca harm it?