YBR125 motorcycle piston ring set, cylinder diameter 54MM, ring groove specification 1.01.02.0MM, perfect match YBR125 piston/cylinder, direct replacement without adjustment; Including air ring (2) + oil ring (1), the air ring is responsible for cylinder sealing pressure, the oil ring is responsible for scraping the cylinder wall excess oil, double guarantee to reduce air leakage, oil burning; The air ring is made of chrome plating alloy, and the oil ring is composed of steel sheets, which has strong anti-wear and anti-carbon deposition ability. It is suitable for long-term high-load cycling and has a longer life. It is the core replacement part for cylinder seal failure and oil burning failure, and is suitable for cylinder overhaul scenario.