Namura NX-10000K2 Top End Kit 53.94 mm Standard Bore 11:1 for 2003 Honda CR125R

The Namura NX-10000K2 Top End Kit is designed for the 2003 Honda CR125R and includes the essential components needed to refresh the engine’s top end. This standard-bore kit features a 53.94 mm piston with an 11:1 compression ratio, along with piston rings, wrist pin, retaining clips, top-end bearing, and a complete gasket kit. It is a practical replacement solution for restoring performance, compression, and dependable operation.

The piston uses a hypereutectic casting process with increased silicon content to help reduce expansion, improve wear resistance, and withstand elevated cylinder temperatures. MOS2, or Teflon/Molybdenum, coated skirts use a rolled-on application process designed to create a stronger bond than conventional spray-on coatings. This coating helps reduce friction, improve heat transfer, and minimize the risk of cold seizure during operation.

Additional piston construction features support durability under demanding riding conditions. The machined smooth head is designed to reflect combustion heat and help reduce carbon buildup, while the anodized dome improves heat resistance and strength compared with non-anodized piston designs. The included components are matched for a complete top-end service on the specified motorcycle. Verify the year, model, bore size, and engine configuration before installation. Manufacturer part number: NX-10000K2. Vendor part number: 185-1002.

Features:

• Fitment: Designed for the 2003 Honda CR125R.
• Kit contents: Includes piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit.
• Piston size: 53.94 mm standard-bore piston with an 11:1 compression ratio.
• MOS2-coated skirts: Rolled-on Teflon/Molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk.
• Machined smooth head: Helps reflect combustion heat and reduce carbon buildup on the piston crown.
• Anodized dome: Improves heat resistance and durability compared with non-anodized piston designs.
• Hypereutectic casting: Higher silicon content helps control expansion, improve wear resistance, and tolerate elevated cylinder temperatures.
• Manufacturer part number: NX-10000K2.
• Vendor part number: 185-1002.