NAMURA NX-40025-4MISSINGWP Piston Kit Wrist Pin .040

( Brand: Namura ), ( Manufacturer Part Number: NX-40025-4MISSINGWP ), ( Part Type: Piston Pin )

Review NAMURA .040 Over Bore Piston Kit For Yamaha Missing Wrist Pin fits YZ250 1999–2017

The Namura NX-40025-4MissingWP 040 Piston Kit is a high-performance upgrade for the Yamaha YZ250 motorcycles manufactured between 1999 and 2017. This piston kit is designed to provide enhanced power and durability, making it an excellent choice for racers, track day enthusiasts, or anyone seeking to improve the performance of their YZ250.

The piston kit includes four pistons, each precision-crafted from forged aluminum alloy. The forging process ensures superior strength and rigidity, which translates to better compression and increased power output. The pistons are also designed with a low friction coating, reducing wear and tear on the engine components and improving overall engine efficiency.

The pistons feature a unique missing wrist pin design. This design eliminates the need for the conventional wrist pin retaining clips, reducing weight and providing a more efficient power transfer between the piston and connecting rod. The missing wrist pin design also enhances the piston's durability, as there are fewer parts that can fail or wear out.

The piston kit is also compatible with the OEM Yamaha rings, making it a straightforward upgrade process. The pistons are precision-machined to ensure a perfect fit, ensuring a seamless installation process. The kit also includes new piston rings, which are designed to provide improved sealing and longer ring life.

In summary, the Namura NX-40025-4MissingWP 040 Piston Kit is an excellent upgrade for the Yamaha YZ250 motorcycles from 1999 to 2017. With its high-strength forged aluminum pistons, missing wrist pin design, and improved ring package, this kit offers enhanced power, durability, and efficiency. Whether you're a racer looking for an edge on the competition or a weekend warrior looking to get the most out of your YZ250, this piston kit is an excellent investment.

Pros and Cons of Buying a Namura NX-40025-4 piston kit for Yamaha YZ250 (1999-2017)

a. Enhanced Performance: The Namura piston kit is designed to provide better combustion efficiency and increased power output. The piston's design improves the engine's overall performance, resulting in better acceleration and top-end speed.

b. Durability: The piston kit is made from high-quality materials, ensuring long-lasting performance. This is an essential factor for off-road motorcycles that undergo rigorous use and rough terrain.

c. Improved Engine Longevity: By upgrading to a high-performance piston kit, you can reduce engine wear and improve the overall longevity of the engine.

d. Customizability: The Namura piston kit offers various options to cater to different riding styles and preferences. For instance, there are pistons available for various compression ratios.

a. Cost: The Namura NX-40025-4 piston kit may be more expensive than the stock OEM piston. However, the performance benefits and potential engine longevity improvements may justify the cost for serious off-road riders.

b. Installation Complexity: Installing the piston kit might require some mechanical skills and knowledge. For those without experience in motorcycle engine rebuilds, it may be best to consult a professional mechanic.

c. Risk of Damage: Installing a new piston kit can pose some risks, especially if not installed correctly. Improper installation could damage the engine or other components, leading to costly repairs.

The Namura NX-40025-4 piston kit for Yamaha YZ250 (1999-2017) offers several benefits, including improved engine performance, durability, and engine longevity. However, it comes with some cons, such as the higher cost and potential installation complexity. Ultimately, the decision to purchase this piston kit depends on the rider's priorities, budget, and mechanical skills. For serious off-road riders seeking enhanced performance and engine longevity, the benefits may outweigh the cons. For casual riders, the stock OEM piston may suffice.

If you are a serious off-road rider looking for better engine performance and improved engine longevity, the Namura NX-40025-4 piston kit for Yamaha YZ250 (1999-2017) is an excellent investment. Ensure that you have the necessary skills and tools to install the kit or consult a professional mechanic to minimize the risks.

Details:

Kit Includes piston, rings, PIN IS MISSING, clips you get exactly what is pictured. Piston is 67.35mm. This is a like new piston. Piston dome is anodized for superior heat resistance and longer lifespan.

There is no warranty. Compatible with Yamaha model's below: 1999 YZ250. You can use the Ask a Question link near bottom of every listing. Kit is for .040 over bore size - 67.40mm.

Piston skirts are Molybdenum Teflon coated to minimize resistance/wear and provide extended life. Made in Taiwan. Compression ratio of 10.9:1. Manufactured by Namura.

part #: nx400254missingwp price

• $49.95

specifications pistondon:

• for models: Yz250
• for makes: Yamaha
• for years: 1999-2017
• brand: Namura
• mpn: Nx-40025-4missingwp
• part type: Piston Pin

returns pistondon:

• policy: No Returns

offer pistondon:

• availability: In Stock
• quantity: 1
• options: Ship-to-home
• started: March 18, 2025
• sold: 0

payments pistondon:

• wallet: Paypal
• other
• credit card: Mastercard

general pistondon:

• condition: New other see details
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits

shipping pistondon:

• cost: $0.00
• class: Standard
• type: Fixed
• transit: 2-6 Days
• service: Standard

seller pistondon:

• city: Suamico, Wisconsin
• # reviews: 7624
• rating: 97.8%

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