Namura Piston Kit - 53.94mm (Standard Bore) | Yamaha YZ125 (2002-2004) NX-40001

Give your Yamaha YZ125 the performance boost it deserves with the Namura NX-40001 Piston Kit. Engineered to deliver a 10.8:1 compression ratio, this kit provides a high-performance alternative to OEM parts without the premium price tag.

Key Features

• MOS2 (Teflon/Molybdenum) Coated Skirts: Specialized coating increases heat transfer and significantly reduces friction, helping to eliminate cold seizures and extend engine life.

• Anodized Domes: Features a hardened surface that is up to 75% stronger than non-anodized pistons, providing superior heat resistance and durability under racing conditions.

• Hyper-Eutectic Casting: Manufactured with a high silicon content to ensure lower expansion rates and better wear resistance than standard cast pistons.

• Smooth Machined Heads: Designed to reflect combustion heat and minimize carbon buildup, keeping your engine cleaner and more efficient.

• Complete Top-End Kit: Includes the individually wrapped piston, a set of OEM-quality rings, a wrist pin, and circlips for a seamless installation.

Product Specifications

⚠️ IMPORTANT NOTICE: Piston components are size and fitment specific. You must measure your cylinder before ordering to ensure the correct clearance. Installing an incorrectly sized piston can cause immediate engine failure. Returns are not accepted on installed engine components.

Shipping Information

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• Service Area: We ship exclusively to the lower 48 states.

• Note: We do not ship to Alaska, Hawaii, Guam, or Puerto Rico.