You sure are right Anlaf.
I just home inspecting xs650 parts from an ebay seller that lived locally. Picking them up tomorrow.
He had a crank/rod, barrels, gears, top case, rocker cover and some misc all for $100. In Aus, thats really cheap. Quite happy for that I would think.
My question is, I know that the case's and rocker/head needs to be matching. So did I answer my own question by asking if you can mix match them?
Anywho, it seems the xs650 might be on the road sooner rather than later. Now to get a set of piston kits.