PISTON KIT B 77MM YAMAHA WR/YZ 250 16-22, ATHENA S5F07700009B

Athena Forged Piston Kit - High Performance and Reliability

Upgrade your motorcycle's performance and reliability with this Athena Forged Piston Kit. Engineered in Italy, Athena is a leader in producing high-quality motorcycle spare parts with over 40 years of experience. This piston kit is designed for optimal performance in off-road applications.

Key Features:

• Forged Piston Construction: Made using a cutting-edge reverse extrusion process and advanced CNC machining for exceptional dimensional accuracy (tolerances less than 0.01 mm).
• High-Performance Alloy: Constructed from a special high-silicon aluminum alloy, offering superior resistance and performance while maintaining OE-level reliability.
• Optimized Profile: Features a smooth profile for regular flow and perfect flame propagation, enhancing combustion efficiency.
• Reduced Friction: Some piston skirts are treated with a molybdenum disulfide coating, applied via screen printing, to further reduce friction, boost performance, and increase durability.
• High-Quality Piston Rings: Rings are produced in Japan with wear-resistant coatings (PVD or chromium nitride) for increased durability and longevity. They ensure excellent cylinder liner adaptation even at low tangential load.
• Complete Kit: Includes piston, pin, circlips, and piston rings. All components are replaceable and interchangeable.
• Engineered for Performance: Rigorously tested on dynamometer benches and on the track under extreme conditions to validate performance and reliability.

Technical Specifications:

• Piston Type: Forged
• Bore Diameter: 76.96 mm
• Compression Height: 20.20 mm
• Compression Ratio: 13.5:1
• Displacement: 250 cc
• Number Of Segments: 2
• Piston Pin Type: Standard
• Big End Pin Diameter: 16x9.5x38 mm
• Net Weight: 0.18 Kg