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1966 9.5 evinrude still overheats

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Upon looking at my duck boat before the season ,

i found that it was overheating ,

i ordered a waterpump kit and a new thermostat and installed them myself

test run the motor and it was still running hot although it was pumping water out the back

i then removed the thermostat wich was still open at the time , and with the cover off started the motor to ensure that it ws pumping plenty of water , and it was

i left the thermostat out put the cover back on and it still overheated ,

i then removed the head and replaced the gasket. the water jackets look very clean due to it being a fresh water motor

started the motor and still the same problem hot hot ..

I have plenty of water flow out the pisser tube .

At this time i have done all i know to do , any ideas
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