1990 70hp outboard overheated

by Bill
(Middletown,PA United states)

While out with my family we were idling through a no wake zone for about 10 minute at around 800 rpm the motor shut off.Thinking it was because of low idle i tried to start it and got nothing.Took cover off and the head and sides were too hot to touch.I installed a new water pump and thermostat at the end of last year and I know 100% that there was a solid stream from the tell tale.After allowing it to cool I ran it back to the dock.Got home and pulled the thermo and there was no crud or sticking.Any thoughts?All help is appriciated.Thanks.

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