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.
Replace the rings if compression has dropped, the engine starts poorly, oil consumption has increased, or bluish smoke comes from the muffler. The +0.75 in the name indicates an oversize — for a cylinder bored for a larger piston diameter. They are chosen according to the piston diameter.
