Wossner 4077DA Piston Kit - 2023-2025 KTM 250 SX-F XC-F Husqvarna FC250 Gas Gas

Wossner 4077DA Premium Forged Piston Kit

When your high-performance 250cc engine requires a top-end refresh, the Wossner 4077DA Piston Kit is the professional choice for restoring Factory Quality throttle response and power. Engineered for the latest generation of KTM, Husqvarna, and Gas Gas 4-stroke platforms, this kit is designed to handle the high-revving demands of both motocross and technical off-road racing. At Moto-House MX, we provide the precision-forged components required to keep your machine at the front of the pack.

Forged from aerospace-grade aluminum alloy, this Premium Series piston features a gas-ported two-ring design for an exceptional combustion seal. The permanent skirt coating significantly reduces friction and piston rock, resulting in a quieter engine and improved mechanical efficiency. Designed with a 12.75:1 compression ratio, this kit balances high-performance output with the rugged durability needed for long motos and aggressive trail riding.

Top Features: Wossner 4077DA Piston Kit

• Aerospace Forged Alloy: Superior strength and heat resistance for high-RPM reliability.
• Gas Ported Design: Enhances ring seal using combustion pressure for maximum power output and consistent compression.
• Low-Friction Skirt Coating: Permanent coating reduces wear and engine noise for smoother operation.
• Precision Lightweight Machining: Maintains structural integrity while reducing reciprocating mass for faster revs.
• Complete Kit: Includes everything needed for a rebuild: forged piston, rings, wrist pin, and clips.

Expert Pro-Tip: The modern 250cc 4-stroke engine relies on tight tolerances for its performance. When installing your new Wossner piston, always verify your valve clearances and use a new top-end gasket kit to ensure a perfect seal and long-term reliability.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2023-2025	KTM	250 SX-F / 250 XC-F
2023-2025	Husqvarna	FC250 / FE 250 / FC 250 Rockstar Ed.
2024-2025	Gas Gas	MC 250F / EX 250F / EC 250F

Frequently Asked Questions

Q: Is this a Standard Size A piston?
A: Yes, this is the 80.95mm piston designed for the standard 81.00mm bore size used in KTM/Husqvarna/Gas Gas 250cc engines.

Q: What are the benefits of gas ports?
A: Gas ports allow combustion pressure to reach the back of the rings, forcing them against the cylinder wall for a superior seal and more consistent power throughout the RPM range.

Q: Will this fit my 2022 or older model?
A: No, this specific kit is engineered for the updated engine platform found in the 2023-2025 KTM/Husqvarna and 2024+ Gas Gas 250cc models.

Recommended Pairings

• Top End Gasket Kit: Essential for a leak-free seal during your engine rebuild.
• Motorex 4-Stroke Engine Oil: The ultimate protection for high-performance forged pistons.

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.