## Piston Rings 69.45mm Namura NA-10025-4R - Reliability and Performance for Your Engine Namura NA-10025-4R piston rings with a diameter of 69.45mm are a key element ensuring optimal operation, efficiency, and longevity of your engine. Often overlooked, piston rings play a crucial role in sealing the combustion chamber and controlling oil consumption. Namura, known for its high-quality motorcycle and scooter parts, delivers a product that will meet the expectations of even the most demanding users. ### Advanced Materials and Technologies Namura NA-10025-4R are made of durable materials such as ductile cast iron or stainless steel alloy, providing excellent wear resistance and sealing. Additional coatings, such as chrome, phosphate, and nitride, enhance durability and adaptation to specific operating conditions. The type of cylinder sleeve, sleeve coating, engine capacity, and stroke type (2 or 4) – all these factors influence the selection of the optimal ring composition. ### Compression Rings Compression rings are made of highly ductile cast iron or stainless steel alloy, guaranteeing excellent sealing and minimizing compression losses. Chrome, phosphate, and nitride coatings increase wear and corrosion resistance. ### Oil Rings Oil rings consist of three separate components: two scraper rails made of highly ductile cast iron or stainless steel alloy and one expansion ring made of stainless steel. They ensure effective removal of excess oil, preventing it from entering the combustion chamber. By choosing Namura NA-10025-4R piston rings, you invest in the reliability and longevity of your engine.