Piston rings Delta 70 "KOSO": piston rings for Delta mopeds. The rings seal the piston in the cylinder: they hold compression and keep oil out of the combustion chamber.
Time to replace when compression drops, hot starts are difficult, oil consumption rises, and there is bluish smoke. The size is chosen by piston diameter. Manufacturer: KOSO. Install the part with clean mounting surfaces and, where possible, new gaskets and fasteners.
