PISTON KIT B 77MM YAMAHA WR/YZ 250 08-13, ATHENA S5F07700007B
ATHENA Forged Piston Ø 76.97 mm for Athena and OE Cylinder - S5F07700007B. Athena, leader in producing motorcycle spare parts for over 40 years, unveils its new range of 4-stroke off-road forged pistons made by reverse extrusion. Produced with cutting-edge CNC machining tools, which ensure dimensional tolerances of less than 0.01 mm, Athena pistons are made of a special high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance. The perfectly smooth profile ensures a regular flow and the perfect flame propagation. Some pistons skirts are moreover treated with a molybdenum disulfide coating applied by screen printing which further reduce friction to enhance performance and durability. Athena engineers ensure advanced technical solutions and the highest quality standards equal to or better than those adopted in OE production, so as to guarantee performance and reliability. Each piston, engineered in Italy by Athena R&D department, is tested on engine dynamometer benches under progressive stress load, and thereafter on track to validate its performance even in the most extreme conditions. The proven quality of Athena pistons is offered at an extremely affordable price. This piston for Athena and OE cylinders is equipped with piston rings that guarantee less friction with the cylinder and therefore a higher performance. Athena takes care of the development of the pistons down to the smallest detail: the rings are produced in Japan with wear-resistant coatings (PVD or chromium nitride) to increase the retain and the durability. The rings perfectly adapt to the cylinder liner even at low tangential load. This piston kit contains the piston, the pin, the circlips, and the piston rings. All components are replaceable and interchangeable in case of need. 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. Technical features: Big End Pin Diameter (mm) 16x10x42, Bore Diameter (mm) 76.97, Compression Height (mm) 22.30, Compression Ratio 13.5:1, Displacement (cc) 250, Net Weight (Kg) 0.21, Number Of Segments 3, Piston Pin Type Standard, Piston Type Forged.
- SKU
- 56-W240.B.ATH
- Brand
- Athena
- Availability
- In Stock (2)
FULL DESCRIPTION
Athena Forged Piston Kit B 77mm for Yamaha WR/YZ 250
Upgrade your motorcycle's performance and reliability with this Athena Forged Piston Kit. Designed with cutting-edge technology and a commitment to quality, Athena pistons are engineered to meet or exceed Original Equipment (OE) standards. This kit ensures exceptional durability and enhanced performance for your off-road adventures.
Each piston is meticulously crafted from a special high-performance aluminum alloy with a high silicon content. Utilizing advanced CNC machining, Athena achieves dimensional tolerances of less than 0.01 mm, guaranteeing a precise fit and optimal function. The perfectly smooth profile promotes regular airflow and ideal flame propagation for improved combustion efficiency.
For reduced friction and increased longevity, some piston skirts are treated with a molybdenum disulfide coating applied via screen printing. Athena's engineering expertise, honed over 40 years in the motorcycle spare parts industry, ensures that every piston undergoes rigorous testing on engine dynamometer benches and on the track, validating their performance even under the most extreme conditions.
This piston kit includes all necessary components: the piston, pin, circlips, and piston rings. The piston rings, manufactured in Japan with wear-resistant coatings (PVD or chromium nitride), are designed to minimize friction with the cylinder, leading to higher performance and extended durability. These rings perfectly adapt to the cylinder liner, even at low tangential loads.
Key Features:
- Forged piston construction for superior strength and performance.
- Special high-performance aluminum alloy with high silicon content.
- Precision CNC machining for tight dimensional tolerances (less than 0.01 mm).
- Molybdenum disulfide coating on select piston skirts to reduce friction.
- High-quality piston rings manufactured in Japan with wear-resistant coatings.
- Includes piston, pin, circlips, and piston rings.
- Engineered in Italy by Athena R&D department.
- Tested for performance and reliability in extreme conditions.
Technical Specifications:
- Big End Pin Diameter: 16x10x42 mm
- Bore Diameter: 76.97 mm
- Compression Height: 22.30 mm
- Compression Ratio: 13.5:1
- Displacement: 250 cc
- Number of Segments: 3
- Piston Type: Forged
Please Note: Products intended for competitive sports use or high-performance applications may not be covered by standard guarantees unless there is a clear case of faultiness. Ensure all parts are installed by qualified professionals. Any use of the product contrary to national regulations is the sole responsibility of the user.
