A set of piston rings, 41.50 mm in diameter, for 2-stroke scooters with chain drive. The rings seal the piston in the cylinder: they hold compression and keep oil out of the combustion chamber. Manufacturer: KOSO. Country of origin: China.
Replace the rings if compression has dropped, the engine starts poorly, oil consumption has gone up, or bluish smoke comes from the muffler. Choose by piston diameter. Before installation, check the cylinder bore and the ring end gap, and install the rings with the gaps staggered in different directions.
