Complete piston kit for 125cc Yamaha and MBK AC 2-valve 4CW engines. Set is suitable for original and Naraku cylinder sets. Delivery includes pistons, piston rings, oil scraper rings, gudgeon pin and gudgeon pin circlip. Complete with the typical Naraku Molybdenum coating for the all-important run-in period. Suitable for MBK and Yamaha 125cc AC engines up to 2003.