Quality piston from NARAKU performance. Suitable for all GY6 63cc cylinders [44mm bore]. This piston has been standard in all NARAKU 63cc cylinder sets since 2009. It can also be used as a quality replacement piston in all Chinese 44mm cylinders. The piston has a molybdenum coating to reduce wear in the run-in period. The CNC-machined grooves in the piston skirt ensure permanent lubrication of the piston. Adopted from racing, there is a lubricating oil bore with sunken oil groove in the small end bearing. Advanced piston technology for 4-stroke engines. Complete piston set with rings, oil scraper rings, gudgeon pin and circlips.