Namura Technologies NX-40080 Piston Kit Standard Bore 46.96mm for Yamaha

The Namura Technologies NX-40080 is a standard bore piston kit designed as a direct OEM replacement for Yamaha engines. Precision-machined to Japanese OEM specifications, this kit installs without modifications or dimensional adjustments, making it a reliable, cost-effective choice for a professional engine rebuild.

Construction & Coating Technology:

• MOS2 (Molybdenum/Teflon) Coated Skirts — Applied via a rolled-on process that bonds 10 times stronger than spray-on coatings, improving heat transfer, reducing friction, and helping eliminate cold seizures
• Anodized Dome — Hard anodized to HRB 105 hardness, providing heat resistance and durability; anodized domes are up to 75% stronger than non-anodized pistons
• Hypereutectic Casting Process — High-silicon aluminum alloy delivers reduced expansion rates, additional wear resistance, and the ability to withstand higher cylinder temperatures
• Machined Smooth Piston Crown — Reflects combustion heat and reduces carbon buildup, with some tests showing up to 6% gains in horsepower and fuel economy

Ring Specifications:

• Rings manufactured by Riken, the world's largest OEM ring manufacturer
• Compression rings composed of highly ductile cast iron or stainless steel alloy with chrome, nitride, or phosphate coatings for a gas-tight seal
• Oil rings feature two scraper rails of ductile cast iron or stainless steel alloy plus a stainless steel expansion ring
• Ring set is also compatible with OEM pistons for added versatility

Complete Kit Includes:

• Piston (individually wrapped) — 46.96mm standard bore, 9.6:1 compression
• OEM-quality piston ring set (packed separately in its own box)
• Wrist pin
• Circlips

Namura's NX-40080 piston kit delivers OEM-level fit and reliability at a competitive price point, making it an ideal solution for restoring engine compression and performance during a top-end rebuild.