PISTON KIT 81MM YAMAHA WR/YZ 250 14-18, ATHENA S4F08100005B 276CC BIG BORE

Athena 276cc Big Bore Forged Piston Kit 81mm

Enhance your motorcycle's performance with this high-quality forged piston kit from Athena. Engineered for demanding off-road applications, this kit is designed to provide superior reliability, durability, and power.

Athena pistons are manufactured using advanced CNC machining tools, ensuring exceptional dimensional accuracy. Constructed from a specialized high-performance aluminum alloy with a high silicon content, these pistons offer robustness comparable to original equipment (OE) while delivering increased strength and improved performance.

Key Features:

• Forged Piston Construction: Offers greater strength and durability compared to cast pistons.
• High-Performance Aluminum Alloy: Features high silicon content for excellent thermal resistance and strength.
• Precision Machining: CNC machined to tolerances of less than 0.01 mm for a perfect fit and optimal performance.
• Optimized Profile: Ensures smooth airflow and efficient flame propagation for better combustion.
• Molybdenum Disulfide Coating: Some piston skirts are treated to reduce friction, further boosting performance and longevity.
• High-Quality Piston Rings: Made in Japan with wear-resistant coatings (PVD or chromium nitride) for increased durability and reduced friction. Rings adapt well to the cylinder liner even at low tangential loads.
• Complete Kit: Includes piston, pin, circlips, and piston rings. All components are replaceable and interchangeable.
• Engineered and Tested in Italy: Developed by Athena's R&D department and rigorously tested on dynamometer benches and on track for validation under extreme conditions.

Technical Specifications:

• Bore Diameter: 80.96 mm
• Displacement: 276 cc (Big Bore application)
• Compression Ratio: 13.2:1
• Piston Type: Forged
• Number Of Segments: 3
• Big End Pin Diameter: 16x10x42 mm
• Piston Pin Type: Standard
• Net Weight: 0.24 Kg

Note: Products designed for increased displacement and power beyond road legal limits are intended exclusively for competitive use. Athena is not responsible for any use contrary to national regulations.