Wossner 4090DA Piston Kit - 2023-2025 KTM 250 SX-F XC-F Husqvarna FC250 Gas Gas

Wossner 4090DA Premium Forged Piston Kit

When your high-revving 250cc engine needs a top-end refresh, the Wossner 4090DA Piston Kit is the ultimate choice for restoring Factory Quality performance. Engineered for the latest generation of KTM, Husqvarna, and Gas Gas 4-stroke powerplants, this kit is designed to handle the extreme demands of professional motocross and off-road racing. At Moto-House MX, we provide the precision-forged components needed to maintain peak compression and reliable power delivery.

Forged from aerospace-grade aluminum alloy, this Premium Series piston is optimized for extreme lightness without compromising structural strength. It features a gas-ported two-ring design that utilizes combustion pressure to push the rings against the cylinder wall for a superior seal. Designed for a high-performance 14.8:1 compression ratio, this kit ensures your bike retains its racing edge while providing the durability required for long motos and technical trails.

Top Features: Wossner 4090DA Piston Kit

• Aerospace Forged Alloy: Superior strength-to-weight ratio for high-RPM reliability.
• Gas Ported Design: Maximizes ring seal for increased compression and consistent horsepower.
• High Compression Performance: Precision machined to support a racing-spec 14.8:1 compression ratio.
• Factory Quality Fitment: Standard Size A (80.95mm) designed for a perfect fit in stock 81.00mm bores.
• Complete Kit: Includes everything needed for a rebuild: forged piston, high-performance rings, wrist pin, and clips.

Expert Pro-Tip: High-compression 4-stroke engines require precise timing and clean fuel. When installing your new Wossner piston, always use a new top-end gasket kit and verify your valve clearances are within factory specifications.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2023-2025	KTM	250 SX-F / 250 XC-F
2023-2025	Husqvarna	FC 250 / FE 250 / FC 250 Rockstar Ed.
2024-2025	Gas Gas	MC 250F / EX 250F / EC 250F

Frequently Asked Questions

Q: Is this piston a direct replacement for the stock part?
A: Yes, this is a Standard Size A (80.95mm) piston designed to fit the 81.00mm stock bore perfectly.

Q: What are the benefits of a gas-ported piston?
A: Gas ports allow combustion pressure to get behind the top ring, forcing it against the cylinder wall for a better seal than standard pistons, resulting in more power.

Q: Does this kit fit the older 2022 and earlier models?
A: No, this kit is specifically designed for the updated engine platform found in the 2023-2025 KTM/Husqvarna and 2024+ Gas Gas 250cc models.

Recommended Pairings

• Top End Gasket Kit: Ensure a leak-free seal by replacing your gaskets during the piston installation.
• Motorex 4-Stroke Engine Oil: Protect your new forged piston with high-performance lubricants.

Restore your bike's racing power today. Buy now at Moto-House MX!

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida. Stop by our local store in Montverde, FL or enjoy lightning-fast shipping across the USA.