## Namura Piston Rings 100.97mm NA-40004-4R - Reliability and Performance for Your Engine Namura 100.97mm NA-40004-4R piston rings are a key component ensuring optimal performance, efficiency, and longevity of your motorcycle or scooter engine. Although often overlooked, piston rings play a fundamental role in maintaining combustion chamber seal and proper lubrication. Namura, a renowned manufacturer of motorcycle parts, provides rings designed for specific applications, guaranteeing a perfect fit and reliability. ### Precise Fit and Top-Quality Materials Namura 100.97mm rings are precisely matched to pistons of the same diameter, ensuring a perfect seal and minimizing compression loss. The type of cylinder sleeve, its coating, engine size, and piston stroke (2 or 4-stroke) – all these factors are considered during design and selection of appropriate materials. As a result, Namura rings provide optimal performance in all conditions. ### Advanced Technologies for Maximum Performance * **Compression Rings:** Made of highly ductile cast iron or stainless steel alloy, they feature excellent wear resistance and provide a gas-tight seal. Additional chrome, phosphate, or nitride coatings enhance their durability and corrosion resistance. * **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. These ensure precise oil metering, minimizing oil consumption and preventing it from entering the combustion chamber. ### Choose Namura Quality By choosing Namura 100.97mm NA-40004-4R piston rings, you are investing in the reliability and longevity of your engine. Precision manufacturing, high-quality materials, and advanced technologies guarantee optimal performance and trouble-free operation.