NAMURA NX-40085-2K Top End Repair Kit 47.95MM

( Brand: Namura ), ( Manufacturer Part Number: NX-40085-2K ), ( Country Of Origin: Taiwan )

Review NAMURA Top End Repair Kit For Yamaha 47.95mm fits YZ85 2003–2018

Introducing the Namura NX-40085-2K Top End Repair Kit, specifically designed for the Yamaha YZ85 motorcycle models produced between 2003 and 2018. This top-tier repair kit is an essential toolkit for any motorcycle enthusiast or mechanic, ensuring a quick and effective solution for engine issues.

The Namura NX-40085-2K Top End Repair Kit is a comprehensive solution for repairing the cylinder head, piston, and related components on your Yamaha YZ85. This kit includes high-quality replacement parts such as:

1. Cylinder Head Gasket Set: This gasket set ensures a perfect seal between the cylinder head and engine block, preventing coolant and oil leaks. The gaskets are precision-machined for a perfect fit and are designed to withstand the rigors of off-road racing.

2. Piston Ring Set: The piston ring set includes new compression rings, oil control rings, and skirt rings. These rings ensure optimal engine performance by maintaining proper compression and controlling oil consumption.

3. Piston Pin and Wrist Pin: The piston pin and wrist pin are critical components in the connecting rod assembly. These new parts ensure smooth engine operation and prevent piston damage.

4. Valve Guides: The valve guides are essential for proper valve function and sealing. The new guides in this kit ensure accurate valve positioning and prevent oil leaks.

5. Valve Seats: The valve seats are responsible for sealing the valves to the cylinder head. The new seats in this kit ensure proper sealing and prevent coolant and oil leaks.

6. Valve Springs and Retainers: The valve springs and retainers ensure proper valve function by maintaining the correct valve clearance. The new springs and retainers in this kit provide the necessary resilience and durability.

7. Timing Chain and Tensioner: The timing chain and tensioner are critical components in the engine's valve train. The new parts in this kit ensure proper engine timing and prevent chain jump.

8. Timing Cover Gasket: The timing cover gasket seals the timing cover to the engine block, preventing oil leaks.

In conclusion, the Namura NX-40085-2K Top End Repair Kit is a must-have for any Yamaha YZ85 owner or mechanic. This comprehensive repair kit includes high-quality replacement parts for the cylinder head, piston, and related components, ensuring optimal engine performance and preventing costly repairs. With this kit, you can confidently repair your Yamaha YZ85 engine and get back to enjoying your off-road adventures.

Pros and Cons of buying a NAMURA NX-40085-2K Top End Repair Kit for 2003-18 Yamaha YZ85 (47.95mm)

a. Comprehensive Repair Kit: This repair kit includes all the necessary parts for a top end rebuild, ensuring that you have everything you need in one place.

b. High-Quality Parts: NAMURA is a well-known brand in the motorcycle industry, and their repair kits are known for their durability and performance.

c. Cost-Effective: Purchasing a complete repair kit can save you money in the long run compared to buying individual parts.

d. Easy Installation: The kit comes with clear instructions, making the installation process easier and more straightforward.

a. Potential Expense: Although the kit is cost-effective in the long run, the upfront cost can be quite high.

b. May Not Include All O-Rings: Some customers have reported that the kit does not include all the necessary O-rings. Be sure to double-check the contents before purchasing.

c. Limited Compatibility: This repair kit is specifically designed for the 2003-18 Yamaha YZ85 with a 47.95mm cylinder. Make sure this is the correct kit for your motorcycle model.

The NAMURA NX-40085-2K Top End Repair Kit for the 2003-18 Yamaha YZ85 (47.95mm) offers several advantages, such as comprehensive coverage, high-quality parts, cost-effectiveness, and easy installation. However, the upfront expense and potential lack of certain O-rings are disadvantages. Ultimately, if you need to rebuild the top end of your Yamaha YZ85, this repair kit is a worthwhile investment for the long-term performance and reliability of your motorcycle.

If you own a 2003-18 Yamaha YZ85 with a 47.95mm cylinder and require a top end rebuild, the NAMURA NX-40085-2K Top End Repair Kit is a solid choice. Ensure that you double-check the contents of the kit before purchasing and consider the upfront cost as a long-term investment in your motorcycle's performance and reliability.

Details:

MOS2 Teflon/Molybdenum Coated Skirts A rolled on application process provides a bond that is 10 times stronger than other spray coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%. Machined Smooth Heads Reflects combustion heat and reduces carbon buildup, protecting the top of piston.

Top End kit includes: piston, rings, wrist pin, clips, top end bearing, and gasket. Free Shipping. Anodized Domes Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized.

part #: nx400852k prices

• $62.49-$62.50

specifications pistondon:

• for models: Yz85
• for makes: Yamaha
• for years: 2003-2018
• brand: Namura
• mpn: Nx-40085-2k
• country of origin: Taiwan

payments pistondon:

• credit card: Diners-club
• other
• wallet: Paypal

general pistondon:

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

shipping pistondon:

• service: Standard
• class: Standard
• type: Fixed
• cost: $0.00
• transit: 4-7 Days

offer pistondon:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: February 19, 2026

returns pistondon:

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

seller pistondon:

• city: Gadsden, Alabama
• # reviews: 12033
• rating: 100.0%

Namura NX-40085-2K Is Similar To:

• Namura Technologies Nx-40080-4os 040 Over Bore Piston Kit For Yamaha 1993-2001 Yz80 48mm (54.4% similar) Manufactured by Namura. Made in taiwan. Kit is for .040 over bore size - 48.00MM. Compression ratio of 8.2:1. Piston dome is anodized for superior heat resistance and longer lifespan. Piston is 47.95MM. Compatible with yamaha model's below: 1993 YZ80. Kit includes piston, rings, pin...(August 11th, 2024)
• Namura Technologies Nx-30000-c Piston Kit Standard Bore 53.96mm (41.8% similar) Bore: 53.96MM, sizing: standard bore, MOS2 made with Teflon /molybdenum coated skirts - a rolled on application process provides a fits bond...(August 12th, 2024)
• Namura Technologies Nx-30004 Size A 53.94mm Piston Kit For Suzuki 2001-2003 Rm125 Standard Bore 54mm (40.2% similar) Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%. Machined smooth heads - reflects combustion heat and reduces carbon buildup, protecting the top of piston...(August 12th, 2024)
• Namura Technologies Nx-30025-b Piston Kit Standard Bore 66.95mm (43.3% similar) Anodized domes - increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized. Machined smooth heads...(August 13th, 2024)
• Namura Nx-10051-2k Top End Repair Kit 0.50mm 39.5mm 10.0 1 Honda Z50r crf50f xr50r (55.6% similar) Everything for a top end rebuild in one box. Comes with enough components to service one engine. Namura top end repair kit 0.50MM 39.5MM 10.0:1 Honda Z50R/CRF50F/XR50R: top-end repair kit can help improve the performance of your ride and keeping it running in peak condition...(August 14th, 2024)
• Namura Technologies Nx-30016-b Piston Kit For Engine Pistons Kits Aw (39.4% similar) Namura NX-30016-B piston kit for engine pistons kits aw: status: in stock...(August 15th, 2024)
• Namura Technologies Nx-20013-b Piston Kit Standard Bore 48.46mm (40.3% similar) Bore: 48.46MM, sizing: standard bore, MOS2 made with Teflon /molybdenum coated skirts - a rolled on application process provides a fits bond that is 10 times stronger than other spray coatings. Actual product may differ from the item shown in photograph. Benefits include increased heat...(August 15th, 2024)
• Namura Nx-10252-2 Piston 71.46mm 0.50mm nx-10252-2 For Honda Crf250f 2019-2022 (36.5% similar) Piston kits are sold per cylinder. Note: image is for reference only, actual product may vary slightly depending on your specific application. Namura piston 71.46MM 0.50MM #NX-10252-2 for Honda CRF250F 2019 -2022: why replace your cylinder when you can the piston a fraction of...(August 16th, 2024)
• Namura Technologies Nx-70020-b Size B 39.47mm Piston Kit For Ktm 2009-2016 50 Sx Standard Bore 39.50mm (36.3% similar) Made in taiwan. Compatible with KTM model's below: 2009 50 SC. Piston dome is anodized for superior heat resistance and longer lifespan. Kit includes piston, rings, pin, clips you get exactly what is pictured. Size b piston is 39.47MM. Kit is for standard bore size - 39.50MM...(August 17th, 2024)
• Namura Technologies Nx-40008-2r Piston Rings 020 Over Bore For Yamaha 1983-2006 Pw80 And 1986-1990 Bw80 47.5mm (44.4% similar) Compatible with yamaha model's below: 1983 PW80. Made in taiwan. Rings are for .020 over bore size - 47.50MM. If you are replacing rings on more than one piston please change quantity in the listing. Manufactured by Namura. Includes two compression rings. Sold per piston...(August 17th, 2024)
• Namura Orna-ra426627-gs 1997-2004 Yamaha Xtz 600 Dirt Bike Piston Rings 95mm (37.2% similar) 1997-2004 yamaha LTZ 600 dirt bike Namura piston rings 95MM: ring set contains: ring to match a single piston. Parts without fitment are to be assumed universal and may require vehicle modification. I need to exchange an item.: brand: Namura, model number: ORAN-RA426627-GS...(August 17th, 2024)