Well, the 30 yr. old Yanmar is dead. My choices as far as I can see are rebuild, replace with diesel, or replace with electric. I'm leaning heavily toward electric.
If you're interested in seeing the specific system I'm leaning toward you can see it at http://www.propulsionmarine.com/
Base system is $5k US. Add about a grand for hi-thrust propellor and batteries.
They custom make the mounting bracket so it fits right in your original motor mounts, lines up with your prop shaft.
It would cost about the same for a new Beta diesel.
Comments?