Namura NX-10026-BK1 Top End Kit for 1992–1996 Honda CR250R, 66.35 mm Bore

The Namura NX-10026-BK1 Top End Kit is designed for Honda CR250R models from 1992 through 1996 equipped with a Nikasil-plated cylinder. This complete top-end solution includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a thorough engine refresh. The 66.35 mm piston size and 8.5:1 compression ratio are engineered for dependable fitment and performance in the specified Honda two-stroke applications.

The piston uses Namura’s hypereutectic casting process, which increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. Its MOS2, or Teflon/molybdenum, coated skirts are applied through a rolled-on process that creates a durable bond while helping transfer heat, reduce friction, and minimize the risk of cold seizures. Machined smooth heads help reflect combustion heat and reduce carbon buildup, supporting piston protection and consistent engine operation.

Anodized domes provide increased heat resistance and durability compared with non-anodized piston designs. The included components make this kit a practical choice for rebuilding the top end of a compatible Honda CR250R engine, whether used during scheduled maintenance or cylinder service. Always inspect the cylinder, confirm the required piston clearance, and verify the existing cylinder coating before installation to ensure proper fit and reliable performance.

Fitment: 1992 Honda CR250R, 1993 Honda CR250R, 1994 Honda CR250R, 1995 Honda CR250R, and 1996 Honda CR250R.

Manufacturer Part Number: NX-10026-BK1
Vendor Part Number: 185-1026B1

Features:

• Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
• Fits 1992–1996 Honda CR250R models with a Nikasil-plated cylinder
• 66.35 mm piston size with an 8.5:1 compression ratio
• MOS2 Teflon/molybdenum-coated piston skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk
• Machined smooth piston head helps reflect combustion heat and reduce carbon buildup
• Anodized piston dome increases heat resistance and durability
• Hypereutectic casting process provides controlled expansion, enhanced wear resistance, and improved high-temperature capability
• Brand: Namura
• Manufacturer Part Number: NX-10026-BK1
• Vendor Part Number: 185-1026B1