## Piston Rings 103.47mm Namura NA-40025-2R - Reliability and High Performance Namura NA-40025-2R piston rings with a diameter of 103.47mm are a key element ensuring optimal engine operation for your motorcycle or scooter. Often overlooked, piston rings have a huge impact on performance, durability, and combustion efficiency. Namura, a renowned manufacturer of motorcycle parts, offers piston rings designed with the highest standards of quality and precision. ### Advanced Materials and Technologies Choosing the right materials for manufacturing piston rings is crucial for their long-lasting and trouble-free operation. Namura uses carefully selected high-ductility cast iron alloys and stainless steel, characterized by excellent wear resistance and providing a tight seal. Additionally, depending on the model, the rings can be coated with chrome, phosphate, or nitride, which further increases their durability and resistance to extreme operating conditions. ### Compression Rings Compression rings, made of highly ductile cast iron or stainless steel, ensure the tightness of the combustion chamber, minimizing power loss and improving combustion efficiency. Chrome, phosphate, or nitride coatings further enhance their resistance to wear and corrosion. ### Oil Control Rings Oil control rings consist of three elements: two scraper rails made of highly ductile cast iron or stainless steel, coated with chrome, nitride, or phosphate, and one stainless steel expander ring. Their task is to precisely dose the oil, preventing it from entering the combustion chamber and ensuring proper cylinder lubrication. ### Namura Brand - Guarantee of Quality By choosing Namura NA-40025-2R piston rings, you are investing in quality and reliability. Namura is a brand with many years of experience in the production of motorcycle parts, known for its precision and attention to detail. This gives you the certainty that your engine will run smoothly and trouble-free for a long time.