I had the same problem, the boat will not rev up after warm. Found the thunder bolt ignition module was the problem. It is bolted onto one the heatexchanger manifolds. The trigger from the pickup, inside the distributor, goes to this module. It contains the advance curve and triggers the coil to fire. I found the problem by putting ice on the module when it was hot, this allowed th motor to rev up again until it overheated again.
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