Im recently in the middle of a rebuild on my 78 cr250 and was curious what piston and rings are recommended. The bore is still stock 70mm bore size and hasnt been sleeved but I was wanting to send the cylinder out to Millennium to get re plated. I know for the standard chrome bores in 78-80 they recommend to run CDM rings. I can only find a stock bore piston kit by wiseco that comes with the CDM rings. Would the CDM rings be ok to run in a plated cylinder after I get it back from Millennium? Or is there a better alternative? Are there standard rings I would be able to run since the bore has been plated. Im having trouble finding them if there is. If you guys have any info or suggestions it would be much appreciated.