NAMURA TECHNOLOGIES FX-40037-BB Standard Piston Kit 76.97MM 77MM

( Brand: Namura Technologies ), ( Manufacturer Part Number: FX-40037-BB ), ( Part Type: Piston ), ( Country Of Origin: Taiwan )

Review NAMURA TECHNOLOGIES Standard Bore Piston Kit Size 76.97mm For Yamaha 77mm fits YZ250FX 2015–2019

Introducing the Namura FX-40037-BB Standard Piston Kit, specifically designed for Yamaha YZ250FX motorcycles manufactured between the years 2015 and 2019. This piston kit comes with a 76.97mm bore size, making it an excellent upgrade for those seeking improved engine performance.

The Namura FX-40037-BB piston kit is meticulously crafted using high-quality materials to ensure durability and reliability. Each piston is engineered with a forged construction, providing enhanced strength and resistance to engine stress. The piston crown is finished with a state-of-the-art NanoTech coating, which minimizes friction and enhances thermal conductivity for optimal engine efficiency.

The piston rings included in this kit are designed to provide a perfect seal within the cylinder bore, ensuring optimal combustion and reducing power loss. The compression rings are made of a specially formulated alloy that provides excellent wear resistance and maintains its shape even under high compression. The oil control rings are designed to minimize oil consumption and prevent engine oil from entering the crankcase.

This standard piston kit also includes a matching, high-performance piston pin. The pin is manufactured from heat-treated steel, ensuring it can withstand the extreme temperatures and pressures within the engine. It is also coated with a protective, anti-seize material to prevent seizure and ensure easy installation and removal.

In conclusion, the Namura FX-40037-BB Standard Piston Kit is an excellent choice for Yamaha YZ250FX owners seeking improved engine performance and durability. With its high-quality materials, precise manufacturing, and advanced design features, this piston kit is sure to provide excellent value and reliability for years to come. Upgrade your Yamaha YZ250FX engine today with the Namura FX-40037-BB Standard Piston Kit.

Pros and Cons of Buying a Namura FX-40137-BB Standard Piston Kit for Yamaha YZ250FX (2015-2019) with 77mm Bore

a. Enhanced Performance: A new piston kit can improve engine performance by ensuring a proper fit and optimal compression ratio, leading to increased power and torque.

b. Durability: This aftermarket piston kit from Namura is designed to withstand the rigors of off-road racing and provide extended engine life.

c. Affordability: Compared to the OEM (Original Equipment Manufacturer) piston kit, the Namura FX-40137-BB is often more affordable, making it an attractive option for budget-conscious riders.

a. Installation Complexity: Installing a piston kit is not a simple task and requires specialized tools, knowledge, and experience. It may be necessary to take the engine to a professional mechanic for installation.

b. Potential Compatibility Issues: While the Namura FX-40137-BB is specifically designed for the Yamaha YZ250FX with a 77mm bore, it is essential to double-check compatibility with other engine components before installation.

c. Risk of Engine Damage: Improper installation or use of subpar aftermarket parts can lead to engine damage. It is crucial to source the piston kit from a reputable supplier and follow installation instructions carefully.

The Namura FX-40137-BB standard piston kit for the Yamaha YZ250FX (2015-2019) with a 77mm bore presents an attractive option for riders looking to enhance their engine's performance and durability without breaking the bank. However, the installation process is complex, and there is a risk of compatibility issues and engine damage if not done correctly. To mitigate these risks, it is recommended to source the piston kit from a reputable supplier, follow installation instructions carefully, and consider having a professional mechanic perform the installation.

Details:

Made in Taiwan. Manufactured by Namura. Namura FORGED Series piston. All Namura Forged pistons come with Namura signature features: 100% CNC-machine piston domes, hard anodized domes for reduced carbon build-up and heat resistance M0S2 coated skirts excellent break-in protection properties.

Namura exclusive forged alloy used offers lower expansion rates, allowing for tighter build tolerances and superior tensile strength at operating temperatures. Kit Includes piston, rings, pin clips you get exactly what is pictured. Kit is for standard bore size - 77.00mm. Size B piston is 76.97mm.

Compatible with Yamaha model's below: 2015 YZ250FX.

part #: fx40037 prices

• $109.20-$136.11

specifications pistondon:

• for models: Yz250fx
• for makes: Yamaha
• for years: 2015-2019
• brand: Namura Technologies
• mpn: Fx-40037-bb
• part type: Piston
• country of origin: Taiwan

shipping pistondon:

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

offer pistondon:

• availability: In Stock
• started: October 21, 2025
• options: Ship-to-home
• sold: 0
• quantity: 1

returns pistondon:

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

seller pistondon:

• city: Suamico, Wisconsin
• # reviews: 392530
• rating: 99.6%

payments pistondon:

• wallet: Paypal
• credit card: Discover
• other

general pistondon:

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

Namura Technologies FX-40037 Is Similar To:

• Namura Technologies Nx-40080-4os 040 Over Bore Piston Kit For Yamaha 1993-2001 Yz80 48mm (66% 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 (51.8% 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 (42% 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 (54.1% 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 Technologies Fx-40049-c (41.5% similar) Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures. Machined smooth heads - reflects combustion heat and reduces carbon buildup, protecting the top of piston. Anodized domes - increases heat resistance and durability; pistons with anodized domes are...(August 13th, 2024)
• Namura Technologies Nx-10080-2r Nx 10080 2 Pistons All Have Molybdenium Skirt (45.1% similar) For kits, photo might show entire kit and listing is only for one component. All Namura pistons have super-high,:: Namura pistons. Note: photos do not always represent the actual product. All Namura pistons have anodized domes that provide superior heat resistance...(August 13th, 2024)
• Namura Orna-ra418207-gs 2004 Honda Cr125 Dirt Bike Piston Rings 53.95mm (39.8% similar) I need to exchange an item. Parts without fitment are to be assumed universal and may require vehicle modification. 2004 Honda CR125 dirt bike Namura piston rings 53.95MM: ring set contains: ring to match a single piston.: brand: Namura, model number: ORAN-RA418207-GS...(August 13th, 2024)
• Namura Nx-10051-2k Top End Repair Kit 0.50mm 39.5mm 10.0 1 Honda Z50r crf50f xr50r (38.5% 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 Orna-ra418127-gs 2001-2002 Kawasaki Kx125 Dirt Bike Piston Rings 53.94mm (35.9% similar) Compatibility: Husqvarna Cr 125 1998 - 2010 , 2012 2013 , wry 2007 , 2009 Honda CR125R 2004 2007 , Kawasaki KX125 2005 , Suzuki RM125 1989 yamaha YZ125 2014 .: brand: Namura, model number: ORAN-RA418127-GS. Parts without fitment are to be assumed universal and may require vehicle...(August 14th, 2024)
• Namura Technologies Nx-30016-b Piston Kit For Engine Pistons Kits Aw (52% similar) Namura NC-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 (52.9% 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)