Namura NA-30050-2K1 Top End Kit, 41.46 mm, +0.50 mm, 11:1 Compression for Kawasaki KFX 50

Restore dependable top-end performance with the Namura NA-30050-2K1 Top End Kit for select Kawasaki KFX 50 models. This 41.46 mm, +0.50 mm kit is designed with an 11:1 compression ratio and includes the essential components needed for a complete top-end rebuild, including a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit.

The Namura piston uses a MOS2, or Teflon/Molybdenum, coated skirt applied through a rolled-on process for a durable bond. This coating helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. The machined smooth head reflects combustion heat and helps reduce carbon buildup, supporting piston protection and consistent engine operation.

An anodized dome increases heat resistance and durability, while the hypereutectic casting process adds silicon for controlled expansion, improved wear resistance, and greater tolerance of elevated cylinder temperatures. The combination of these features makes the NA-30050-2K1 a practical choice for rebuilding the top end of compatible Kawasaki youth ATVs.

This Namura top-end kit fits 2003, 2004, 2005, and 2006 Kawasaki KFX 50 models. Verify the engine configuration and required oversize piston specification before installation. Manufacturer part number: NA-30050-2K1. Vendor part number: 186-30502.

Features:

• Complete Top End Kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit.
• Piston Size: 41.46 mm with a +0.50 mm oversize specification and an 11:1 compression ratio.
• MOS2-Coated Skirt: 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 for improved piston protection.
• Anodized Dome: Improves heat resistance and durability compared with non-anodized piston domes.
• Hypereutectic Construction: Higher silicon content helps control expansion, resist wear, and withstand elevated cylinder temperatures.
• Fitment: Fits 2003–2006 Kawasaki KFX 50 models.
• Brand and Part Numbers: Namura manufacturer part number NA-30050-2K1; vendor part number 186-30502.