## Namura NA-40000R Piston Rings 63.95mm - Reliability and Performance for Your Engine Namura NA-40000R piston rings with a diameter of 63.95mm are a key element in ensuring optimal performance, durability, and efficiency of your motorcycle or scooter engine. Often overlooked, piston rings play a vital role in ensuring the combustion chamber's tightness and proper lubrication. Namura, a renowned manufacturer of motorcycle parts, offers top-quality piston rings designed for the specific requirements of various engine types. ### Advanced Materials and Technologies The materials used in the production of Namura NA-40000R piston rings guarantee their exceptional durability and wear resistance. Both highly ductile cast iron and stainless steel alloys offer excellent sealing properties. Additional coatings such as chrome, phosphate, and nitride increase resistance to abrasion and corrosion, adapting the rings to the specific operating conditions of the engine. The type of cylinder sleeve, its coating, engine size, and stroke type (2 or 4-stroke) – all these factors are taken into account when designing Namura rings to ensure a perfect fit and optimal performance. ### Compression Rings Compression rings, made of ductile cast iron or stainless steel, guarantee the tightness of the combustion chamber, minimizing pressure loss and ensuring maximum engine efficiency. Chrome, phosphate, or nitride coatings further enhance their wear resistance. ### Oil Rings Oil rings consist of three components: two scraper rails made of ductile cast iron or stainless steel, coated with chrome, nitride, or phosphate, and a single expander ring made of stainless steel. This set effectively regulates the amount of oil on the cylinder walls, preventing excessive wear and ensuring optimal lubrication. By choosing Namura NA-40000R piston rings, you invest in the reliability and longevity of your engine.