Wossner 8957DA 14.0:1 Piston Kit 76.96 mm | Yamaha YZ250F 2019-2025

Restore lost power and ensure your engine stays at the front of the pack with the Wossner 8957DA Premium Series Piston Kit. Engineered specifically for high-performance Yamaha 250cc four-strokes, this kit offers a precision-fit 76.96mm bore and a crisp 14.0:1 compression ratio. At Moto-House MX, we know that Racing Performance isn't just a buzzword—it's the difference between a podium finish and a DNF, which is why we only stock components that meet professional standards.

Wossner utilizes a signature double-bridge forging process and a specialized 3D crown design to handle the extreme heat and pressure of modern motocross racing. These pistons feature skirt coatings for reduced friction and enhanced piston pin oiling slots to ensure maximum lubrication under load. This lightweight, forged aluminum alloy construction allows for tighter wall clearances, resulting in a quieter, smoother-running engine with superior ring seal and oil control.

Top Features: Wossner 8957DA Piston Kit

• Double Bridge Forging: Advanced structural design for maximum strength and minimal weight.
• 14.0:1 Compression Ratio: Optimized for high-output 4-stroke performance and throttle response.
• Skirt Coating: Specialized treatment to reduce friction and accelerate the break-in process.
• Enhanced Lubrication: Radial boss machining and annular grooves for superior wrist pin oiling.
• Complete Kit: Includes the 76.96mm piston, ring set, wrist pin, and retaining clips for a full top-end refresh.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2019-2025	Yamaha	YZ250F
2020-2025	Yamaha	YZ250FX
2020-2025	Yamaha	WR250F

Frequently Asked Questions

Is this an OEM replacement or a performance upgrade?
While it serves as a direct-fit replacement, the Wossner 8957DA is a forged performance upgrade that offers better durability and tighter tolerances than a standard cast piston.

What is included in the box?
The kit is ready to install and includes the forged piston, high-quality ring set, wrist pin, and two retaining clips.

Does the skirt coating wear off immediately?
The coating is designed to assist during the critical break-in period to prevent scuffing, eventually wearing into a perfectly mated surface with your cylinder wall.

Upgrade Your Ride and get the reliability you need for the track or the trail. Buy the Wossner 8957DA Piston Kit today from Moto-House MX.

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The best motocross shop in Central Florida.