Piston Kit B 95mm KTM SX-F450 21-22, Husqvarna, Athena S5F09500002B

This Athena forged piston kit features a 94.96mm bore and is engineered for OE cylinders across select 450cc models from GasGas, Husqvarna, and KTM. Manufactured using reverse extrusion and precision CNC machining, the piston ensures dimensional tolerances below 0.01mm. Constructed from a high-silicon aluminium alloy, it offers durability and performance on par with or exceeding OE standards. The kit includes the piston, pin, circlips, and rings, with low-friction coatings to maximise reliability and efficiency.

Features

• Forged piston made using reverse extrusion and CNC machining

• Constructed from high-performance aluminum alloy with high silicon content

• Tolerances below 0.01mm for OE-level fit and function

• Flat head design for consistent combustion

• Piston rings with PVD or chromium nitride coatings for enhanced wear resistance

• Molybdenum disulfide skirt coating (on select models) for reduced friction

• Developed, engineered, and bench-tested in Italy

Specifications

• Bore Size: 94.96mm

• Displacement: 449 cm³

• Compression Ratio: 12.8:1

• Compression Height: 22.80 mm

• Number of Segments: 2

• Piston Head Type: Flat

• Piston Type: Forged

• Piston Pin Type: Biconical

• Pin Dimensions: 19 x 10 x 45 mm

Cross-Reference OEM Part Numbers

• S5F09500002B

Vehicle Fitments

• GasGas EX F 450 (2021–2022)

• GasGas MC F 450 (2021–2022)

• Husqvarna FC 450 (KTM engine, 2021–2022)

• Husqvarna FS 450 (KTM engine, 2021–2022)

• Husqvarna FX 450 (2021–2022)

• KTM SMR 450 (2021–2022)

• KTM SX-F 450 (2021–2022)