Namura Technologies NX-40025-B 66.36mm Piston Kit with MOS2 Coating

The Namura Technologies NX-40025-B is a 66.36mm OEM-replacement piston kit engineered for powersports engines. Built using a hypereutectic casting process, this piston features higher silicon content that reduces thermal expansion rates, improves wear resistance, and allows the piston to withstand elevated cylinder temperatures — all without sacrificing reliability.

Kit Includes:

• Piston (individually wrapped)
• OEM-quality piston rings (same quantity as stock), packaged separately
• Wrist pin
• Circlips

Key Features:

• MOS2 (Molybdenum Disulfide / Teflon) Coated Skirts — Applied via a rolled-on process that bonds up to 10 times stronger than spray-on coatings, promoting increased heat transfer, reduced friction, and protection against cold seizures
• Machined Smooth Head — Reflects combustion heat back into the combustion chamber to reduce carbon buildup on the piston crown; testing has shown potential gains of up to 6% in horsepower and fuel economy
• Hard Anodized Dome — Increases heat resistance and surface durability; anodized domes are approximately 75% stronger than non-anodized alternatives
• Hypereutectic Casting — Elevated silicon content reduces expansion rates, adds wear resistance, and improves performance under high cylinder temperatures
• Direct OEM Replacement — No modifications or dimensional adjustments required for installation

The Namura NX-40025-B delivers higher-performance piston technology at an accessible price point, making it an ideal choice for engine rebuilds and top-end replacements.