I found a woodmizer sawmill with a bad engine. I am kicking around the idea of putting a 2cyl diesel into it. PM me with prices if you have a new or used engine for sale.
The TY290 2 cylinders have been out of production for several years now and thought parts seem to be OK for now, it is just a matter of time before they get scarce. Just a thought.
I'd look at one of the honda clones coming from China. Cheap price and a great little motor. I've got a 16hp on my chinese genset. It looks and runs just like a honda.