## Namura Piston Rings 65.45mm NA-40000-6R - Reliability and Performance for Your Engine Namura 65.45mm NA-40000-6R piston rings are a key component for optimal engine performance, efficiency, and longevity. Often overlooked, these rings play a crucial role in ensuring combustion chamber sealing and proper lubrication. Namura, a renowned manufacturer of motorcycle parts, delivers piston rings designed for specific applications, guaranteeing a perfect fit and reliability. ### Advanced Materials and Technologies Namura utilizes high-quality materials and advanced technologies in the production of its piston rings. The type of cylinder sleeve, its coating, engine size, and piston stroke – all these factors influence the selection of the appropriate material composition to meet operational requirements. ### Compression Rings The compression rings are made of highly ductile cast iron or stainless steel alloy, providing excellent wear resistance and a tight seal. Additionally, chrome, phosphate, and nitride coatings enhance their durability and effectiveness depending on the specific application. ### Oil Control Rings Oil control rings consist of three components: two scraper rings made of highly ductile cast iron or stainless steel alloy, coated with chrome, nitride, or phosphate, and one expander ring made of stainless steel. This design ensures precise oil metering, minimizing oil consumption and preventing it from entering the combustion chamber. ### Piston Diameter: 65.45mm These rings are perfectly matched for pistons with a diameter of 65.45mm, guaranteeing precise operation and optimal performance. By choosing Namura NA-40000-6R piston rings, you are investing in quality, reliability, and the long life of your engine.