TOP END PISTON & GASKET KIT 77MM YAMAHA WR/YZ 250 14-15, ATHENA P5F0770187008B, SET B
Forged 4-stroke piston Ø 76.97 mm with top end gasket kit. This kit combines two essential engine components for excellent results. The pistons are made from a special high-performance aluminum alloy with a high silicon content, produced using state-of-the-art CNC machines. Some pistons feature a molybdenum disulfide coating on the skirts to reduce friction. Piston rings, made in Japan, have wear-resistant coatings (PVD or chromium nitride) for increased durability. The gasket kits are based on extensive experience and technological development, ensuring perfect cutting quality with the latest generation lasers. Technical features include a Big End Pin Diameter of 16x10x42 mm, Bore Diameter of 76.97 mm, Compression Height of 20.40 mm, Compression Ratio of 13.5:1, Displacement of 250 cc, 2 segments, Standard Piston Pin Type, and Forged Piston Type. All Athena products produced in greater displacement and power than those provided by the road code of the user's country are intended exclusively for competitive use. Athena declines all responsibility for any use of the product contrary to national regulations. Guarantee of compliance should not be applicable to products destined for competitive sports use or which are used in high-performance or high-speed applications unless it is a clear case of faultiness.
- SKU
- 56-T1005.B_ATH
- Brand
- Athena
- Availability
- In Stock (1)
FULL DESCRIPTION
Athena Top End Piston and Gasket Kit for Yamaha WR/YZ 250
This Athena Top End Piston Kit provides a perfect combination of a forged 4-stroke piston and a top-end gasket kit, designed for optimal engine performance and reliability. Athena studies, develops, and tests all piston technologies and materials in-house, ensuring seamless integration with their engineered compatible gaskets for an excellent result.
The forged pistons are manufactured using state-of-the-art numerical control (CNC) machines from a special high-performance aluminum alloy with a high silicon content. This ensures OE piston reliability while offering increased resistance and excellent performance. The smooth piston profile promotes regular flow and perfect flame propagation. Some pistons feature a molybdenum disulfide coating on the skirts, applied by screen printing, to further reduce friction, enhance performance, and extend durability. The included piston rings, Made in Japan, are designed with wear-resistant coatings (PVD or chromium nitride) to minimize friction with the cylinder, increasing performance and durability.
Athena's gasket kits are built upon over 40 years of industry experience, guaranteeing reliability. Their kits are developed with constant technological advancement by an internal team of engineers and designers, and produced following strict manufacturer parameters. The use of the latest generation lasers ensures perfect cutting quality. Athena utilizes a wide availability of raw materials, applies surface treatments to compensate for irregularities, and follows material stress-relieving processes to improve sealing in critical areas.
Key Features:
- Forged 4-stroke piston for high performance and durability.
- Includes a complete top-end gasket kit for a perfect seal.
- High-performance aluminum alloy with high silicon content.
- Molybdenum disulfide coating on some piston skirts to reduce friction.
- Japanese-made piston rings with wear-resistant coatings (PVD or chromium nitride).
- Precisely engineered gaskets for maximum reliability.
- Designed for competitive use, offering enhanced displacement and power.
Technical Specifications:
- Big End Pin Diameter: 16x10x42 mm
- Bore Diameter: 76.97 mm
- Compression Height: 20.40 mm
- Compression Ratio: 13.5:1
- Displacement: 250 cc
- Number Of Segments: 2
- Piston Pin Type: Standard
- Piston Type: Forged