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I know... mea culpa... As I said, after some more research this seems to be a "not uncommon" issue. Its even dedicatedly covered in the Rotax Service Manual
To me, the first thing to check when there is an over heating issue is to check the thermostat. I’d want to verify that it was functioning properly to ascertain whether or not it was the issue, and since I had it out I’d replace it with a new one AFTER verifying that it worked properly.
When you find a solution to get the temperature back down, please share the solution. I’m obviously interested. I didn’t want to point you in this direction unnecessarily, and hopefully this is not needed in your case, since it sounds like an expensive solution. However, the link below documents another boater’s high engine temperature issue that was resolved with a new ride plate, thermostat and water pump. Maybe you’ve already seen this thread. Ouch$$$
Looks like the ride plate did the trick in that instance. That makes total sense that is where all the heat from the engine is rejected.
I read that thread yet, as I pointed out earlier, the ride plate being "clogged" is something I technically barely understand, the channels are very wide and its only fresh water/coolant in there...
nevermind, 6mm allen ballhead needed
