I've fried 3 times a Evinrude 15 HP due to water intakes blockage by algae, kelp, even a banan peel when at wot. Engine stopped in less than a minute and smoked worst than an indian. The engine was bit seized when pulling cord untill cooled down, impeller was found a rubber mess, completely melted against pump liner.
Other than melting some cable sheaths that were close to cylinder head, cleaning liner pump and replacing a new impeller, the only other parts required were a head gasket, thermostat, plugs and that's it. One issue is to overheat an engine at speeds less than wot, other at full wot. 1996 engine is still runing today...
Bear in mind that one thing is seizing an engine due to water overheat in which gererally you end up seizing pistons momentarily, other due to lack of lubrication in which you end up seizing and screwing forever the whole engine, bad music, costly repair...