## Namura NA-10012-4R Piston Rings 102.97mm - Reliability and Performance The Namura NA-10012-4R piston rings with a diameter of 102.97mm are a key element for optimal engine performance, durability, and efficiency. Often overlooked, piston rings play a vital role in ensuring combustion chamber sealing and proper cylinder lubrication. Namura, a renowned manufacturer of motorcycle parts, designs its rings for specific applications, taking into account the type of cylinder sleeve, its coating, engine size, and stroke type (2 or 4). ### Advanced Materials and Technologies The use of high-quality materials is the foundation of the reliability of Namura piston rings. Both compression and oil rings are made of durable alloys, guaranteeing long-lasting operation. #### Compression Rings Namura NA-10012-4R compression rings are made of highly ductile cast iron or stainless steel alloy, ensuring excellent wear resistance and sealing. Additionally, depending on the model, chrome, phosphate, or nitride coatings are used to meet the requirements of specific applications. #### 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 design ensures optimal lubrication and prevents oil from entering the combustion chamber. ### Choosing Namura - A Guarantee of Quality By choosing Namura NA-10012-4R piston rings, you are investing in quality and reliability. The precision of workmanship, the selection of materials, and advanced production technologies guarantee long-lasting and trouble-free operation of your motorcycle or scooter engine.