Does the 210 lbs include the weight of the outdrive? That's light. My 90 E-TEC is light for it's hp but it weighs 320.
No, I think that is about the bare weight of a Mazda 7A wankel. It is quite possible to build small aluminum V6 engines in the same power/weight class (the powerheasd alone on the new Verado engines is awfully small). The Rotax V6 engines come to mind. If it produced 200 horsepower it would still need an outdrive that could absorb that power and that would add considerably to the installed weight, plus freshwater cooling, plus induction system, plus exhaust system, plus engine mounting system, your Etec would still be lighter. Then there is the emission thing, years of research have gone into modern two stroke nd four stroke outboards to get the emissions down to compliance levels. You might note that a Mazda RX7 used a catalytic converter. That would not work in a boat so considerable effort would be required to clean the emissions up. Hard to beat the installed (total) weight of an outboard, that is one of the big reasons why most serious small offshore boats use them.
Talk about weight, an Allison 250 turboshaft can produce in the neighborhood of 1200shaft horsepower and it is smaller than a Mazda rotary, I can nearly put one in my lap. Really cool engine to work on too. To bad they cost about--oh--250,000 or more. Something like that would yank all the 2X4s out o'yer Bayliner, suppose you could put hydrofoils on it --BUT--it is all pie in the sky. N