## Namura NA-50004R Piston Rings 91.97mm - Reliability and Performance The Namura NA-50004R piston rings with a diameter of 91.97mm are a key component for ensuring optimal engine performance in your motorcycle. Often overlooked, piston rings play a vital role in ensuring efficiency, durability, and a tight seal. Namura, known for its high-quality motorcycle parts, delivers a product that meets the demands of even the most discerning riders. ### Advanced Materials and Technologies Namura NA-50004R are designed for specific applications, taking into account the type of cylinder sleeve, its coating, engine size, and stroke type. The materials used, such as ductile cast iron and stainless steel alloys, guarantee excellent wear resistance and sealing. Additional coatings, such as chrome, phosphate, and nitride, increase the rings' lifespan and performance. ### Compression Rings The compression rings, made of ductile cast iron or stainless steel, provide a tight seal for the combustion chamber, minimizing power loss and fuel consumption. Chrome, phosphate, or nitride coatings further enhance their resistance to high temperatures and pressure. ### Oil Rings The oil ring set consists of three components: two scraper rings made of ductile cast iron or stainless steel, coated with chrome, nitride, or phosphate, and one expander ring made of stainless steel. Their task is to precisely dose the oil, preventing it from entering the combustion chamber and ensuring proper cylinder lubrication. ### Choose Namura Quality By choosing Namura NA-50004R piston rings, you are investing in the reliability and performance of your engine. Precision manufacturing, high-quality materials, and advanced technologies guarantee long-lasting and trouble-free operation.