Wossner 4070DA 95mm Piston Kit Standard A - KTM 450 EXC-F Husky FE450 Gas

High-Compression Factory Quality Power for 450cc Performance

Elevate your 450cc engine to professional racing standards with the Wossner 4070DA Premium Series Piston Kit. This Standard Size A (95mm) forged piston is engineered for the latest generation of KTM, Husqvarna, and Gas Gas 450cc 4-stroke machines. Forged from aerospace-grade aluminum alloy, it offers the ultimate combination of lightweight performance and high-stress durability. With a massive 14.4:1 compression ratio, this kit is designed for riders who demand maximum torque and explosive acceleration. Whether you are tackling technical enduros or high-speed dual-sport sections, get the competitive edge from Moto-House MX. Works great with most professional-grade Motocross and Off-Road 450cc engines.

The technical innovation of the 4070DA lies in its Gas Ported, Two-Ring design. Lateral gas ports utilize combustion pressure to force the top ring against the cylinder wall, creating a superior seal that maximizes power and minimizes blow-by. To ensure longevity, the piston features a permanent skirt coating that reduces friction and "piston rock" for a quieter, smoother-running top end. Optimized machining in the crown and skirt walls maintains critical strength while shedding every possible gram of reciprocating mass. This complete Premium Series kit includes the forged piston, high-performance rings, wrist pin, and clips for a top-tier engine refresh.

Top Features: Wossner 4070DA Premium Series Kit

• Gas Ported Technology: Utilizes lateral ports to improve ring seal under high combustion pressure for maximum power output.
• High-Compression (14.4:1): Specifically engineered to boost low-end torque and overall engine response in 450cc powerplants.
• Standard Size A (94.95mm): Precision-matched for 95.00mm cylinders that are new or in like-new factory condition.
• Two-Ring Design: Optimized for a perfect balance between reduced friction and high-performance sealing.
• Anti-Friction Skirt Treatment: Permanent dry-film lubricant prevents scuffing and reduces engine noise during extreme heat cycles.

Expert Pro-Tip

Due to the high 14.4:1 compression ratio, this piston kit requires the use of high-quality, high-octane racing fuel or premium pump gas with an octane booster to prevent detonation and ensure peak engine longevity.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2024-2025	Gas Gas	EC 450F
2023-2025	Husqvarna	FE450
2023-2025	KTM	450 XCF-W
2022-2024	KTM	450 EXC-F

Frequently Asked Questions

Q: What are the benefits of a gas-ported piston?
A: Gas ports use combustion gases to press the piston ring harder against the cylinder wall, providing a much better seal and more horsepower than non-ported pistons.

Q: Does "Size A" fit my used cylinder?
A: Size A is intended for new or freshly replated cylinders. If your cylinder has high hours, have a professional measure the bore to see if you need a Size B for correct clearance.

Q: Can I use this for street riding?
A: Yes, while high-performance, the Wossner Premium Series is durable enough for Street, Dual-Sport, and Off-Road riding styles.

Recommended Pairings: Top-End Gasket Set, High-Performance Cam Chain, and Synthetic 10W-50 Racing Oil.

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Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida.