## Namura NX-10200-4R Piston Rings 66.47mm - Reliability and Performance Namura NX-10200-4R piston rings with a diameter of 66.47mm are a key element ensuring optimal engine operation. Often overlooked, piston rings play a crucial role in ensuring efficiency, durability, and a tight seal. Namura, known for its high-quality motorcycle and scooter parts, offers piston rings designed for the specific requirements of each vehicle. The type of cylinder sleeve, sleeve coating, engine size, and piston stroke (2 or 4 stroke) all influence the selection of the appropriate material and ring design. ### Key features of Namura piston rings: * **Precise fit:** The 66.47mm diameter guarantees a perfect fit in the cylinder, minimizing compression loss and ensuring optimal engine performance. * **High-quality materials:** Namura rings are made of durable cast iron or stainless steel alloys, ensuring long life and wear resistance. * **Advanced coatings:** Depending on the model, the rings may be coated with chrome, phosphate, or nitride, further increasing their resistance to abrasion and corrosion. * **Optimal design:** Both compression and oil rings are designed to provide an excellent seal and effective lubrication. ### Compression Rings: The purpose of compression rings is to seal the combustion chamber and prevent gases from escaping into the crankcase. Made of highly ductile cast iron or stainless steel alloy, they are characterized by excellent wear resistance and provide a tight seal. ### Oil Rings: Oil rings consist of three components: two scraper rails made of highly ductile cast iron or stainless steel alloy, and one expander ring made of stainless steel. Their task is to regulate the amount of oil on the cylinder walls, preventing excessive wear and ensuring optimal lubrication. By choosing Namura NX-10200-4R piston rings, you are investing in the reliability and performance of your engine.