Namura NX-10000-2K Top End Kit 54.44 mm, +0.50 mm, 11:1 for Honda CR125R

Restore dependable top-end performance with the Namura NX-10000-2K Top End Kit. Designed for select Honda CR125R two-stroke models, this kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit needed for a complete top-end rebuild. The 54.44 mm piston size and +0.50 mm oversize specification are intended for compatible applications requiring a matching cylinder bore.

The Namura piston uses a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand higher cylinder temperatures. Its MOS2, or Teflon and molybdenum, coated skirts use a rolled-on application process for a strong coating bond. This finish helps reduce friction, improve heat transfer, and minimize the risk of cold seizures during operation.

The machined smooth head helps reflect combustion heat and reduce carbon buildup, supporting piston protection and consistent engine operation. An anodized dome further improves heat resistance and durability, while the 11:1 compression ratio is suited to the specified Honda CR125R application. The included gasket kit and top-end components help simplify installation when rebuilding the upper portion of the engine.

Manufacturer and vendor part number: NX-10000-2K. Fitment includes 1992, 1993, 1994, 1995, 1996, 1997, 1998, and 1999 Honda CR125R models. Verify cylinder condition, required oversize, compression ratio, and application details before installation to ensure proper fitment.

Features:

• Complete Top End Kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit.
• MOS2-Coated Skirts: Rolled-on Teflon and molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk.
• Machined Smooth Head: Helps reflect combustion heat and reduce carbon buildup for improved piston protection.
• Anodized Dome: Improves heat resistance and durability compared with non-anodized piston domes.
• Hypereutectic Casting: Higher silicon content helps control expansion, improve wear resistance, and withstand elevated cylinder temperatures.
• Application: Fits 1992–1999 Honda CR125R models.
• Specification: 54.44 mm piston, +0.50 mm oversize, 11:1 compression ratio.
• Brand and Part Number: Namura NX-10000-2K.