1 season (but i race 2 bikes, so not really a full season?) on +2mm overbore CP KWS spec 14:1 yamaha R6 pistons. great shape, i just replace stuff more often than some i guess? $300 plus shipping. Rings, pistons, and wrist pins. Obviously it would be a good idea to use new rings that can be sourced from CP/Carrillo or KWS motorsports.