Piston rings (set) Delta 50 cc - 39 mm: 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. Country: China. After installation, check how the assembly works at idle and over a short ride.
