im glad to see its not just me, maybe the demand just isnt that high considering o.s. only made a short run of water cooled 4 strokes. ive heard about people soldering aluminum water cooling tubes onto the head or cooling fins of air cooled 4 strokes, with what success im not too sure, but its at least a thought. ive also heard of running a cooling tube through the oil reservior on hondas(that have gas and oil seperate) much like older porsches and vw's with pretty good success. the only problem with using one of these engines if height constraints, 4 strokes are pretty dang tall.

nate sanders