Oh, By the way, the oil I am running is Klotz super tecniplate, which is a mix of 80%synthetic and 20% castor. I have nothing at all against running castor in the fuel, and I find a mix of both gets the benifit of both oils. I always tune to the rich side of peak.
I will probably just run it the way it is. I doubt i will be able to get the piston/liner/bearings replaced. Like I said before it runs just fine so I guess i will keep running in this shape.

Stefan