Same problem
Mike i had a simular problem to this 2 weeks ago, firstly the engine started cutting out while at sea and would start up again straight away with no apparent problems, then as it got worse the engine would not rev very high, back on the beach we first cleaned the fuel filter and pipes and checked the fuel pump, then ran the engine again with clean water going through, the powerhead was getting hot so we whipped out the thermostat and ran the engine again without the thermostat and with clean water running through it, it still got hot and the water comming through the pee hole was getting hotter, so we attempted to drop the lower leg and gave this up as a bad idea due to the fact we were on the beach, the boats at a friends now having the impellor changed out, after talking with people i've found out my engine has a clever cut out system when it gets too hot, this stops you destroying the engine and the drop in revs will give you enough to get you home slowly.
Good luck
Richard
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