PISTON KIT 90MM KTM EXC-F/SX-F/XC-F 350 11-15, ATHENA S4F090000050 365CC BIG BORE

Athena Forged Racing Piston Kit - Big Bore 90mm

This Athena forged racing piston kit is designed for high-performance motorcycle engines. Manufactured using advanced reverse extrusion techniques and precision CNC machining, these pistons ensure exceptional dimensional accuracy of less than 0.01 mm. Crafted from a special high-silicon aluminum alloy, they offer a superior balance of reliability, resistance, and performance, meeting or exceeding Original Equipment (OE) standards.

The piston's smooth profile promotes efficient gas flow and optimal flame propagation. Some piston skirts feature a molybdenum disulfide coating, applied via screen printing, to further reduce friction, thereby enhancing performance and extending durability. Each piston is engineered in Italy by the Athena R&D department and undergoes rigorous testing on dynamometer benches and in real-world track conditions to validate its performance.

This kit includes a piston, pin, circlips, and piston rings. The piston rings are produced in Japan with wear-resistant coatings (PVD or chromium nitride) to improve retention and durability, ensuring a perfect fit with the cylinder liner even under low tangential load. All included components are replaceable and interchangeable for ease of maintenance.

Key Features:

• Forged Piston Type
• Big Bore 90mm Diameter (89.96 mm)
• High Performance Aluminum Alloy with High Silicon Content
• Reduced Friction with Molybdenum Disulfide Coating (on some models)
• Precision CNC Machining for Tight Tolerances
• Engineered and Tested for Extreme Conditions
• Includes Piston, Pin, Circlips, and Piston Rings
• Japanese-Made Piston Rings with Wear-Resistant Coatings
• Compression Ratio: 13.5:1
• Number of Segments: 2
• Piston Pin Type: Standard
• Net Weight: 0.35 Kg

Technical Specifications:

• Big End Pin Diameter: 18x10,5x44,5 mm
• Bore Diameter: 89.96 mm
• Compression Ratio: 13.5:1
• Displacement: 350 cc
• Net Weight: 0.35 Kg
• Number Of Segments: 2
• Piston Pin Type: Standard
• Piston Type: Forged

Note: Products designed for increased displacement and power may be intended exclusively for competitive use. Please adhere to all local regulations regarding vehicle modifications.