PISTON KIT +5.60mm BIG BORE 72.00mm YAMAHA YZ 2T 250 2003 - 2025 ATHENA S4F07200006B
Athena forged racing piston kit with a bore diameter of 71.96 mm is designed for the Athena Big Bore Cylinder. It is manufactured using a high-performance aluminum alloy with a high silicon content for enhanced strength and reliability, and is CNC-machined for tight tolerances of less than 0.01 mm. The piston's smooth profile promotes optimal flow and flame propagation. Certain models feature a molybdenum disulfide coating on the skirt to reduce friction. The kit includes piston rings with a low-friction design and wear-resistant coatings, piston, pin, and circlips. This piston is intended exclusively for competitive use. Specifications include a big end pin diameter of 18x13x53.5 mm, a compression ratio of 16.0:1, a displacement of 250 cc, a net weight of 0.34 kg, 3 segments, a domed piston head, a biconical piston pin type, and a forged piston type. Cross-reference OEM part numbers include S4F07200006A and S41316257.
- SKU
- 56-K156.72.PIB
- Brand
- Athena
- Availability
- In Stock (1)
FULL DESCRIPTION
Athena Big Bore Forged Piston Kit for Yamaha YZ 250 2T
Enhance the performance and durability of your Yamaha YZ 250 2T with the Athena Big Bore Forged Piston Kit. This high-performance piston is precision-engineered for competitive use, offering superior strength and reliability.
Key Features:
- Forged Construction: Crafted from a high-performance aluminum alloy with a high silicon content for exceptional strength and longevity.
- Precision Machining: CNC machined to tight tolerances of less than 0.01 mm for optimal fit and performance.
- Optimized Combustion: Features a smooth piston profile designed to promote efficient flow and flame propagation.
- Friction Reduction: Some models include a molybdenum disulfide coating on the skirt to minimize friction.
- High-Quality Rings: Equipped with Japanese-made piston rings featuring low-friction design and wear-resistant coatings (PVD or chromium nitride).
- Complete Kit: Includes the piston, pin, circlips, and piston rings for a comprehensive upgrade.
Specifications:
- Piston Type: Forged
- Bore Diameter: 71.96 mm
- Piston Head Type: Domed
- Piston Pin Type: Biconical
- Number of Segments: 3
- Compression Ratio: 16.0:1
- Displacement: 250 cc
- Big End Pin Diameter: 18x13x53.5 mm
- Net Weight: 0.34 kg
