PISTON KIT B 85MM HONDA CRF 250 18-21, ATHENA S4F08500004B 289CC BIG BORE, KIT B

Athena Forged Racing Piston Kit for Big Bore Cylinders

Elevate your motorcycle's performance with this Athena Forged Racing Piston Kit. Designed as a direct replacement for Athena Big Bore Cylinder kits, this piston is engineered for superior strength, reliability, and enhanced power output. Crafted from a specialized high-performance aluminum alloy with a high silicon content, it offers exceptional resistance and durability that matches or exceeds original equipment standards.

The manufacturing process utilizes advanced CNC machining tools, ensuring extremely precise dimensional tolerances. This meticulous attention to detail guarantees a perfect fit and optimal function within your engine. Some piston skirts feature a molybdenum disulfide coating applied through screen printing, which significantly reduces friction, further boosting performance and extending the piston's lifespan.

Athena's commitment to quality extends to the included piston rings, produced in Japan with wear-resistant coatings like PVD or chromium nitride. These rings are designed to minimize friction with the cylinder liner, leading to higher performance and increased durability, while maintaining optimal seal even at low tangential loads.

This comprehensive kit includes the piston, piston pin, circlips, and piston rings. All components are designed for interchangeability and can be replaced individually if needed.

Key Features:

• Forged Piston Construction: Offers superior strength and durability compared to cast pistons.
• High-Performance Aluminum Alloy: Features high silicon content for enhanced resistance and performance.
• Precision CNC Machining: Ensures dimensional tolerances less than 0.01 mm for a perfect fit and function.
• Optional Molybdenum Disulfide Coating: Reduces friction for improved performance and durability on select models.
• High-Quality Piston Rings: Made in Japan with advanced wear-resistant coatings for longevity and optimal sealing.
• Complete Kit: Includes piston, pin, circlips, and piston rings for a hassle-free installation.
• Engineered in Italy: Subjected to rigorous dynamometer and track testing to validate performance in extreme conditions.

Technical Specifications:

• Bore Diameter: 85.00 mm
• Compression Height: 18.92 mm
• Compression Ratio: 13.0:1
• Displacement: 289 cc
• Number of Segments (Rings): 2
• Piston Pin Type: Biconical
• Piston Type: Forged
• Big End Pin Diameter: 16x40x9 mm