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The only Japanese powerplant that I know of that fits your bill is the Honda NX 250.
It is only 27 hp though.
Actually that was my point : 4 stroke wise, anything over 100 hp per liter is starting to be not too efficient, not to mention reliability.
How about quads powerplant ?
Some of them do have a reverse.
We have been discussing de-tuning DOHC engines by Atkinson timing their inlet.
Might be a good way to use some bigger capacity engines.
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