Set of 57.40 mm piston rings for 125–150 cc 4-stroke scooters. The rings seal the piston in the cylinder: they hold compression and keep oil out of the combustion chamber. Manufacturer: SEE. Country of origin: China.
Signs of worn rings: loss of power, hard starting, oil on the spark plug and bluish exhaust smoke. The +0.25 in the name indicates an oversize — for a cylinder bored for a larger piston diameter. The ring size must match the piston diameter in the cylinder.
