Motorcycle Engine Parts Piston Rings Kit Bore STD ~ +100 Size 66mm ~ 67mm For CRM250 246 KAE MD24 CRM 250 Piston ring set designed for use with select two-stroke motorcycle engines.Constructed from nodular cast iron, the rings are built to support consistent engine performance under demanding operating conditions.The material structure contributes to durability and resistance to wear during regular use.This kit is compatible with multiple bore sizes ranging from standard to +100, corresponding to diameters of 66mm through 67mm in increments of 0.25mm.It fits models associated with designation 246 KAE and MD24, allowing flexibility for engine rebuilds or performance tuning.The design supports proper compression and oil control within the cylinder.The product meets ISO9001 standards for manufacturing processes.It is intended as a direct replacement for piston rings and requires no modifications during installation.Regular inspection and replacement of piston rings are advised based on engine usage and operating environment to maintain engine efficiency.