## Namura NA-10000-3R 90.71mm Piston Rings - Reliability and Performance for Your Engine Namura 90.71mm NA-10000-3R piston rings are a key component for optimal performance, efficiency, and longevity of your motorcycle or scooter engine. Often overlooked, piston rings play a vital role in ensuring combustion chamber sealing and proper cylinder lubrication. Namura, renowned for high-quality parts for two-wheelers, provides rings designed for specific applications, guaranteeing a perfect fit and optimal operation. ### Advanced Materials and Technologies Namura utilizes durable and wear-resistant materials in the production of NA-10000-3R piston rings, such as high-grade ductile cast iron or stainless steel. The selection of the appropriate material depends on the type of cylinder liner, its coating, engine capacity, and stroke type (2 or 4). Additional coatings, such as chrome, phosphate, and nitride, enhance durability and resistance to extreme temperatures and loads. ### Compression Rings Compression rings, made of ductile cast iron or stainless steel, ensure combustion chamber sealing, minimizing pressure loss and maximizing engine efficiency. Chrome, phosphate, or nitride coatings further enhance their wear resistance. ### Oil Rings Oil rings consist of three components: two scraper rings made of ductile cast iron or stainless steel with a chrome, nitride, or phosphate coating, and one expander ring made of stainless steel. Their task is to precisely dose the oil, preventing excessive oil consumption and ensuring proper cylinder lubrication. By choosing Namura 90.71mm NA-10000-3R piston rings, you invest in the reliability and longevity of your engine.