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)

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.