## Namura NA-40025-4R Piston Rings 103.97mm - Reliability and Performance for Your Engine Namura NA-40025-4R piston rings, with a diameter of 103.97mm, are a key element in ensuring optimal performance, efficiency, and longevity of your engine. While often overlooked, piston rings play a fundamental role in sealing the combustion chamber and controlling oil consumption. Namura, renowned for its high-quality motorcycle and scooter parts, offers a product designed for precision and durability. ### Advanced Materials and Technologies Namura NA-40025-4R utilizes specifically selected materials tailored to the specific requirements of the application. The type of cylinder sleeve, its coating, engine size, and piston stroke (2 or 4 stroke) – all these factors influence the composition of the rings, guaranteeing a perfect fit for operating conditions. ### Compression Rings Made of highly ductile cast iron or stainless steel alloy, the compression rings are characterized by excellent wear resistance and provide a tight seal for the combustion chamber. Additional chrome, phosphate, and nitride coatings enhance their durability and effectiveness. ### Oil Rings The oil ring set consists of three components: two scraper rails made of highly ductile cast iron or stainless steel, coated with chrome, nitride, or phosphate, and one stainless steel expander ring. This design ensures optimal lubrication and minimizes oil consumption. ### Namura Brand - Guarantee of Quality By choosing Namura NA-40025-4R piston rings, you invest in proven quality and reliability. The Namura brand is synonymous with precision, innovation, and attention to detail, which translates into excellent performance and a long lifespan for your engine.