PISTON KIT B 77MM YAMAHA YZ 250F 14-15, ATHENA S5F07700008B

Athena Forged Piston Kit B - 77mm Bore

Enhance the performance and durability of your motorcycle with the Athena Forged Piston Kit B. Crafted from a special high-performance aluminum alloy with a high silicon content, these pistons are designed to meet or exceed Original Equipment (OE) standards, offering greater resistance and excellent performance for off-road applications.

Produced using cutting-edge CNC machining tools, Athena pistons achieve dimensional tolerances of less than 0.01 mm. The perfectly smooth piston profile promotes regular flow and optimal flame propagation. Some piston skirts feature a molybdenum disulfide coating applied via screen printing to further reduce friction, boosting performance and longevity.

Every Athena piston is engineered in Italy and rigorously tested on engine dynamometer benches and on the track to validate performance under extreme conditions. This piston kit includes the piston, pin, circlips, and piston rings. The piston rings are produced in Japan with wear-resistant coatings (PVD or chromium nitride) for increased retention and durability, ensuring they adapt perfectly to the cylinder liner even at low tangential loads.

Key Features:

• Forged piston for superior strength and performance.
• High silicon aluminum alloy for enhanced reliability and resistance.
• Precision CNC machining for tight tolerances (less than 0.01 mm).
• Smooth profile for improved airflow and flame propagation.
• Optional molybdenum disulfide coating on some skirts to reduce friction.
• Includes piston, pin, circlips, and piston rings.
• High-quality piston rings with wear-resistant coatings.
• Designed and tested by Athena R&D for extreme conditions.

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
• Net Weight: 0.20 kg
• Number of Segments: 2
• Piston Pin Type: Standard
• Piston Type: Forged