NAMURA FX-40045-BK Top End Repair Kit 94.96MM 12.5 WR/YZ450F

( Brand: Namura ), ( Manufacturer Part Number: FX-40045-BK )

Review NAMURA Top End Repair Kit 94.96mm Size 12.5 For Yamaha Wr/yz450f fits YZ450F WR

The Namura FX-40045-BK Top End Repair Kit is specifically designed for the Yamaha WR450F and YZ450F motorcycles with a cylinder diameter of 94.96mm and a piston compression height of 12.5mm. This top end repair kit is an essential tool for any off-road rider or mechanic looking to maintain or restore the performance of their Yamaha dirt bike.

The kit includes all the necessary components for a comprehensive top end rebuild, ensuring a complete and accurate repair. The kit comprises a new piston, piston pin, piston pin bushing, three rings (compression ring, oil control ring, and piston ring), and a new piston pin retainer. This comprehensive selection of parts ensures that every wearable component in the top end of the engine is replaced during the rebuild, ensuring optimal engine performance and longevity.

The piston is made of high-quality, forged material, ensuring strength and durability. The piston features a precision-machined crown and skirt, ensuring a perfect fit and seal in the cylinder. The piston pin is also made of high-strength material and is precisely machined to ensure a snug fit in the piston and a secure connection to the connecting rod.

The piston rings in the kit are carefully selected to provide optimal sealing and performance. The compression ring is designed to seal the combustion chamber and provide the necessary compression for the engine to run efficiently. The oil control ring is responsible for preventing oil from entering the combustion chamber, ensuring clean and efficient engine operation. The piston ring is designed to seal the piston in the cylinder, ensuring optimal power transfer and engine efficiency.

The piston pin bushing and piston pin retainer are also included in the kit to ensure a seamless installation process. The piston pin bushing is a critical component that ensures the smooth operation of the piston pin and prevents wear and damage to the engine. The piston pin retainer holds the piston pin in place and provides additional strength to the top end of the engine.

In summary, the Namura FX-40045-BK Top End Repair Kit is an essential tool for any Yamaha WR450F or YZ450F rider or mechanic looking to maintain or restore the performance of their motorcycle. With a comprehensive selection of high-quality components, this kit ensures a complete and accurate top end rebuild, ensuring optimal engine performance and longevity.

The Namura FX-40045-BK Top End Repair Kit is designed for Yamaha WR/YZ450F motorcycles with a 94.96mm bore size and a 12.5:1 compression ratio. This repair kit includes various parts required for a top end rebuild, such as piston, piston ring set, compression ring set, and cylinder head gasket.

1. OEM-quality parts: Namura is a well-known and reputable manufacturer of aftermarket motorcycle parts. The FX-40045-BK kit includes OEM-quality parts that are designed to fit and function perfectly with your Yamaha motorcycle.

2. Complete repair solution: The kit includes all the necessary parts for a top end rebuild, making it a convenient and cost-effective option for those looking to do the job themselves.

3. Improved performance: A top end rebuild can help improve the performance of your motorcycle by restoring the engine to its original condition and optimizing the combustion process.

1. Cost: The cost of the kit can be relatively high compared to the cost of individual parts. However, it is important to note that the convenience and time saved by purchasing a complete kit may offset the additional cost.

2. Skill level required: Top end rebuilds require a certain level of mechanical skill and experience. If you are not confident in your ability to complete the job yourself, it may be worth considering having the work done by a professional mechanic.

The Namura FX-40045-BK Top End Repair Kit is a high-quality option for those looking to rebuild the top end of their Yamaha WR/YZ450F motorcycle. While the cost may be a concern for some, the convenience and performance benefits of purchasing a complete kit may outweigh the additional cost. However, it is important to ensure that you have the necessary skills and experience to complete the job yourself.

If you are confident in your mechanical skills and have the necessary tools, the Namura FX-40045-BK Top End Repair Kit is a great option for a top end rebuild of your Yamaha WR/YZ450F motorcycle. However, if you are unsure of your abilities or lack the necessary tools, it may be worth considering having the work done by a professional mechanic to ensure a successful and safe repair.

Details:

Comes with enough components to service one engine. Piston comes with rings. Top end gasket kit. Namura Top End Repair Kit 94.96mm Size B 12.5:1 FX-40045-BK for Yamaha WR/YZ450F: top-end repair kit can help improve the performance of your ride and keeping it running in peak condition.

NOTE: Image is for reference only, actual product may vary slightly depending on your specific application. Everything for a top end rebuild in one box.

part #: fx40045 prices

• $125.99-$192.79

specifications pistondon:

• for models: Yz450f, Wr
• for makes: Yamaha
• brand: Namura
• mpn: Fx-40045-bk

seller pistondon:

• # reviews: 665377
• city: Grand Rapids, Michigan
• rating: 99.7%

shipping pistondon:

• cost: $0.00
• class: Standard
• type: Fixed
• transit: 2-4 Days
• carrier: UPS
• service: UPS Ground

payments pistondon:

• other
• credit card: Visa
• wallet: Paypal

offer pistondon:

• sold: 0
• started: January 5, 2026
• quantity: 2
• availability: In Stock
• options: Ship-to-home

returns pistondon:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

general pistondon:

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

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