Athena Piston Kit for Yamaha YZ85, 47.45 mm (S4C04750005A)

The ATHENA S4C04750005A Piston Kit is engineered for Yamaha YZ85 engines requiring dependable replacement performance and precise fitment. Manufactured from a special high-performance aluminum alloy with high silicon content, this piston is designed to withstand demanding operating conditions while providing reliability comparable to the original equipment piston. Its 47.45 mm application size supports accurate installation when matched to the appropriate engine specifications and service requirements.
Built to handle intense motocross use, the ATHENA piston delivers high resistance to mechanical and thermal stresses. The alloy construction helps support durability under elevated temperatures and repeated engine loads, making it a practical choice for riders, technicians, and performance-focused engine rebuilds. The kit is developed for the Yamaha YZ85 and is identified by part number S4C04750005A for straightforward product reference.
ATHENA validates its piston components through progressive stress-load testing on engine dynamometer benches, followed by track testing in extreme conditions. This testing process helps confirm performance, durability, and consistent operation beyond standard workshop conditions. Whether used for scheduled maintenance or a performance-oriented rebuild, the ATHENA S4C04750005A Piston Kit provides a trusted replacement solution for Yamaha YZ85 applications.

Features:

• Application: Designed for Yamaha YZ85 engines

• Part Number: S4C04750005A

• Piston Size: 47.45 mm

• Material: Special high-performance aluminum alloy with high silicon content

• Durability: High resistance to mechanical and thermal stresses

• Testing: Validated through engine dynamometer and track testing under progressive and extreme conditions

• Reliability: Engineered to provide reliability comparable to the original equipment piston

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