## Piston Rings 85.45mm Namura NA-40011-4R - Reliability and Performance for Your Engine The Namura NA-40011-4R piston rings, with a diameter of 85.45mm, are a crucial element for optimal performance, efficiency, and durability of your motorcycle or scooter engine. Often overlooked, these rings play a fundamental role in ensuring combustion chamber sealing and proper cylinder lubrication. ### Advanced Materials and Technology Namura, a renowned manufacturer of motorcycle parts, utilizes high-quality materials and advanced technologies in the production of piston rings. The selection of appropriate materials, such as highly ductile cast iron or stainless steel alloy, ensures excellent wear resistance and creates a gas-tight seal. Additionally, chrome, phosphate, and nitride coatings enhance durability and performance under various engine operating conditions. ### Compression Rings Compression rings, made of ductile cast iron or stainless steel, ensure the sealing of the combustion chamber, minimizing compression losses and maximizing engine power. Chrome, nitride, or phosphate coatings further enhance their wear resistance. ### Oil Rings The oil ring set consists of three components: two scraper rails, made of ductile cast iron or stainless steel with a chrome, nitride, or phosphate coating, and a single expander ring made of stainless steel. This design ensures effective cylinder lubrication, minimizing wear and preventing excessive oil consumption. ### Namura Brand - Guarantee of Quality By choosing Namura NA-40011-4R piston rings, you are investing in a top-quality product that will ensure long and trouble-free operation of your engine.