Bob, I'm no marine mechanic....nor would I ever pretend to be one...but when I owned an inboard, (Volvo/Penta)....both marine mechanics that serviced her had me convinced that she didn't need a thermostat.
After removing it, the boat ran much better.....I'd imagine that if they come with a thermostat, they call for it...but I'm not sure if it's truly NEEDED?
Not sure how I/B's vs. O/B's compare when it comes to requiring a thermostat?
Just sharing my experience...
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