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cisco said..
Kubotas are hard to beat for performance and reliability. Nanni and Beta engines are Kubotas.
+1
Both use the same kubota block then converted for marine use, buy spares from a tractor shop and save $$ Simple, solid and reliable. If I was to repower both would be at #1, then buy on price.
Ive heard Lombardini are also good, just don't know about spares availability, good power to weight.
The next question, often the weakest link.... sail or shaft drive? Both have pro/con, more differences in a cat though
Also got warned to avoid The Green Death of Volvo's.... no experience so can't say... Spares $$$ ???
Older donks, Bukh is as basic as it gets, just get robbed on parts in Oz, and not economic to run as thirsty if compared to others in class... weekends fine, but wouldn't want on a long passage in remote areas.
Yanmar is a stable, nice motor and probably #2 on repower list, beside too many wires/electrics on newer ones..some sail drives had issues, and if turbo... keep revs up to keep clean
No experience with Universal, though look really simple and easy to work on
Sole??? No idea
Has anyone ever heard of a converted Toyota( either Hilux or Old cruiser diesel ) Simple reliable old diesels.... parts everywhere... or is there something that just doesn't suit?? Size, running on angle??? No kits to marinize?
Electric with Genset and ****e loads of lithium is the future. Just cost/space prohibitive for smaller boats.
I dont think theres much in performance between most, power to weight would be the biggest difference , economy ... and price/availability of parts.
Just keep all well maintained and the right sized prop...all it should be reliable.