So apparently the RD250 project I have is an Oceana/Australasia 250G. I've been reading that the head gaskets for these are particularly difficult to find (I think they're one piece?) and the pistons are different to normal. Does anyone know anything about these bikes? Will gasket kits, pistons etc from other models of rd250 fit, or are they really hard to find bits for? The model code on the frame is 3m3 002356 and the build date is 12/79. Thanks for any help.