## Namura NA-10000-4R Piston Rings 90.96mm - Reliability and Performance Namura NA-10000-4R piston rings with a diameter of 90.96mm are a key element for optimal engine performance. Often overlooked, these rings play a vital role in the efficiency, durability, and smooth operation of the power unit. Namura, known for its high-quality motorcycle and scooter parts, designs its rings for specific applications, taking into account the type of cylinder liner, liner coating, engine size, and stroke type (2 or 4). ### Advanced Materials and Technologies The materials used in the production of Namura piston rings are one of the most important factors influencing their performance. Both compression and oil rings are made of high-quality alloys, ensuring excellent wear resistance and sealing. ### Compression Rings Namura compression rings are made of highly ductile cast iron or stainless steel alloy. Both materials offer excellent wear resistance and provide a gas-tight seal. Additionally, depending on the model, chrome, phosphate, and nitride coatings are used to meet the demands of the specific application. ### Oil Rings Namura oil rings consist of three separate components: two scraper rails made of highly ductile cast iron or stainless steel alloy, coated with chrome, nitride, or phosphate, and a single expander ring made of stainless steel. This solution ensures optimal lubrication and prevents oil from entering the combustion chamber. ### Technical Parameters * Piston Diameter: 90.96mm By choosing Namura NA-10000-4R piston rings, you are investing in the reliability and longevity of your engine.