WÖSSNER Forged Piston – Manufacturer Part No. 4090DB
Forged aluminum piston designed for motocross engines, precisely machined to match specific bore dimensions. Designed for use on off-road circuits, this piston features an oversized dimension B (+0.01 mm) and a nominal diameter of Ø 80.960 mm. The forged design ensures a homogeneous structure and good mechanical performance under the thermal and mechanical stresses typical of motocross practice.
- Manufacturer Part No.: 4090DB
- Piston Diameter: 80.96 mm (Ø 80.960 mm)
- Oversize: B (+0.01 mm)
- Wössner Compression Ratio: 14.8:1
- Recommended Ring: RIK81.00A
- Material: Forged Aluminum
- Piston Compression: Standard
Compatible with 250 cc engines of the listed motocross models (among others): HUSQVARNA FC 250 2025, KTM 250 SX‑F 2024, and GAS GAS EC 250 F 2024. Ideal for preparations and maintenance requiring an oversize B; be sure to check the cylinder bore and replace the rings during installation. Wössner product, part number 4090DB, for motocross enthusiasts demanding a precision replacement part.
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