Namura Technologies NA-40025-4K Hyperdryve Top-End Repair Kit +1.00mm Oversize 103.97mm

The Namura Technologies NA-40025-4K is a complete Hyperdryve Top-End Repair Kit designed for a +1.00mm oversize bore of 103.97mm. This all-inclusive kit provides everything needed to perform a full top-end engine rebuild, restoring lost compression and power to get your machine running at peak condition again.

At the heart of this kit is Namura's Hyperdryve piston, engineered from a hypereutectic aluminum alloy originally developed for the space industry. Engineered to maintain its high tensile strength up to 700°F (370°C) — 50% higher than a conventional cast piston — the Hyperdryve piston delivers the performance and durability of a forged piston at a fraction of the cost.

Piston Features:

• MOS2 (Teflon/Molybdenum) Coated Skirts — Roll-on application bonds 10x stronger than spray-on coatings, increasing heat transfer, reducing friction, and helping eliminate cold seizures
• Machined Smooth Piston Crown — Reflects combustion heat and reduces carbon buildup to protect the piston top
• Hard Anodized Crown — Hardness of HRB 105; anodized domes are 75% stronger than non-anodized pistons
• Hypereutectic Casting — Higher silicon content reduces expansion rates and increases wear resistance while withstanding higher cylinder temperatures

Gasket Features:

• Manufactured to OE specifications — no trimming or fitment issues
• Materials tested to ASTM standards for temperature, oil, fuel, and coolant resistance
• Each design meets or exceeds OE performance standards

Kit Includes:

• Piston
• Piston rings
• Wrist pin
• Circlips
• Top-end bearing
• Top-end gasket kit

The Namura NA-40025-4K delivers high-performance engine rebuild components without the premium price tag, making it an ideal choice for riders looking to restore or improve engine performance.