ATHENA FORGED PISTON KIT YAMAHA YZ250 2003-2024, 72mm BIG BORE

Athena Forged Racing Piston Kit Ø 71.96 mm is designed for the Athena Big Bore Cylinder, offering high-performance durability and precision engineering. Manufactured using advanced CNC machining for tight tolerances of less than 0.01 mm, this piston is made from a high-performance aluminum alloy with a high silicon content for enhanced strength and reliability. The piston’s smooth profile promotes optimal flow and flame propagation, while certain models feature a molybdenum disulfide coating on the skirt to reduce friction. Engineered and tested in Italy under extreme conditions, this piston kit ensures excellent performance and longevity.

Features

• Forged piston with high-performance aluminum alloy construction
• CNC-machined for dimensional accuracy within 0.01 mm
• High silicon content for strength and durability
• Smooth profile for optimized flow and combustion
• Some models include molybdenum disulfide skirt coating for reduced friction
• Piston rings with low-friction design for improved performance
• Japanese-made piston rings with wear-resistant coatings (PVD or chromium nitride)
• Includes piston, pin, circlips, and piston rings
• Designed exclusively for competitive use

Specifications

• Big End Pin Diameter: 18x13x53.5 mm
• Bore Diameter: 71.96 mm
• Compression Ratio: 16.0:1
• Displacement: 250 cc
• Net Weight: 0.34 kg
• Number of Segments: 3
• Piston Head Type: Domed
• Piston Pin Type: Biconical
• Piston Type: Forged

Cross-Reference OEM Part Numbers

• S4F07200006A Piston Kit 71.95
• S41316257 Rings

Vehicle Fitments

• Yamaha YZ 250 2T (2003-2025)