Description
If you’re running a YZ250 that sees serious track time, piston wear is inevitable—and it directly impacts combustion efficiency, throttle response, and engine longevity. This Wossner kit delivers OEM-quality engineering with measurable gains in reliability and consistent power delivery across the entire RPM range. A complete piston assembly swap eliminates the guesswork and ensures your engine breathes and performs at peak capability.
The aerospace-grade aluminum construction resists deformation under the extreme thermal cycling of 2-stroke operation, while the permanent skirt coating reduces friction and mechanical noise without compromising structural integrity. Every component—piston, rings, wrist pin, and clips—is precision-engineered to work as a unified system, maintaining tight tolerances that newer pistons demand for optimal ring seal and combustion pressure.
- Bore diameter: 66.36mm
- Material: Aerospace-grade aluminum
- Skirt coating: Permanent friction-reduction
- Engine application: YZ250 1999–2020
- Kit contents: Complete assembly
- Piston, rings, pin, clips: Included
- Fitment: Model-specific (YZ250)
- Installation: Requires engine disassembly
- Manufacturer: Wossner
- Part number: 8217DB
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