Fish, I replaced my aged 17hp 2 cylinder marinized Kubota with a 25hp Kubota based Beta.
Quite a task which included a new larger fuel tank, complete engine bed, exhaust system, electrical wiring, prop and battery management etc....
Basically I have turned my old log of wood sailboat into a launch and realistically the total speed gain achieved from old to new is about 1.5 extra knots when motoring to wind and tide.
Got sick and tired of beating home up the harbour at 3 or so knots which in my view has more tidal flow due to the harbour being constantly stolen by POAL.
In fifteen years of ownership the old Kubota received one birthday and never let us down, however now we have a smooth modern quieter? more powerful donk and its red as well.
I use diggers onsite frequently that have similar Kubota power plants and they run and sound like the ducks nuts .
The only weakness in the Beta conversion is the aluminium heat exchanger casing so keeping the pencil anode refreshed is important.
I do not like Volvos not only because they are green.
Yanmar was my first choice but price and layout saw me go Beta.
I have sound insulated only the removable engine compartment front/companion steps and sound wise we are happy, I do like to be able hear a engine run.