A set of piston rings, 43.00 mm in diameter, for 2-stroke scooters with a belt-driven variator. The rings seal the piston in the cylinder: they hold compression and keep oil out of the combustion chamber. Manufacturer: KOSO.
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 the oversize: for a cylinder bored for a larger piston diameter. The ring size must match the piston diameter in the cylinder.
