I'll give you a dealers responce...
John,There are realy only two engine manufactorers in the small marine diesel arena, Yanmar and Kubota. Everyone knows of Yanmars reputation. Beta, Universal, Westerbeke and Phasor all use a Kubota engine and adapt them for marine use.Beta has enginered their engines for easier servicing than the others. Depending on which hull you have you, should be able to upgrade to a 3 cylinder engine. A 3 cylinder engine is substantialy smother than a 2 cyl. The physical dimensions of a 20 to 30 hp are nearly the same, so get the biggest bang for you dollar.Try these links;www.betamarinenc.comwww.westerbeke.comwww.yanmar.comwww.phasormarine.comPat McCartinInland Marine DieselBuford, GAimd_ga@hotmail.com