## Namura NA-40000-3R Piston Rings 64.70mm - Reliability and High Performance Often overlooked, piston rings are a crucial element influencing engine performance, durability, and efficiency. The Namura NA-40000-3R piston rings, with a diameter of 64.70mm, guarantee quality and precision, designed specifically for demanding motorcycle and scooter users. ### Advanced Materials and Technologies Namura, a renowned manufacturer of motorcycle parts, uses the highest quality materials in the production of NA-40000-3R piston rings, such as highly ductile cast iron and stainless steel alloys. The selection of materials depends on the type of cylinder liner, its coating, engine size, and stroke type (2 or 4). This ensures the rings perfectly match the engine's operating specifics, providing optimal performance and long service life. ### Compression Rings Namura NA-40000-3R compression rings are made of highly ductile cast iron or stainless steel alloy, characterized by excellent wear resistance. Additional chrome, phosphate, and nitride coatings increase their durability and sealing efficiency, minimizing compression losses. ### Oil Control Rings Namura NA-40000-3R oil control rings consist of three components: two scraper rails made of highly ductile cast iron or stainless steel alloy, coated with chrome, nitride, or phosphate, and one stainless steel expander ring. This design ensures precise oil metering, preventing excessive oil burning and keeping the engine clean. ### Namura Brand - Synonym of Quality By choosing Namura NA-40000-3R piston rings, you invest in the reliability and longevity of your engine. The Namura brand is a guarantee of the highest quality and precision, confirmed by many years of experience in the motorcycle industry.