So . I have next 1.5 RD 80 , disassembled , at home lying around .. but the engine is 2x with piston eater available . There is also a RD 250 , where “only” the gearbox is broken and the tank rusted through . Now I have heard that the old models of Yamaha are very compatible ..there I thought that I either: – the RD 250 a RD 80 transmission and tank miss – or the RD 80 the RD 250 motor .. (does the carburettor also have to be replaced ?) it is possible this part I just want to build a “fun-machine” and stay as cost-effective as possible. That various seals have to be replaced, ignition candle bought and work on the carburettor is clear to me. My father has the possibility to hone the cylinder in the work.. but the coating is the expensive. What do I have to do if I want to repair a piston-eater ? -buy a piston kit -buy new seals-cylinder honing and coating .. is that the Everything or other things are coming up?