Wossner Piston Kit Yamaha YFZ450 2004-2025 12.4-13.0:1 CR 8601DA

Stock pistons can't handle the demands of high-performance riding—they'll fail under sustained load, excessive heat, and aggressive tuning. The Wossner 8601DA replaces your factory piston with a precision-engineered component that delivers measurably better ring seal, reduced friction losses, and the thermal stability needed for consistent power delivery across your YFZ450's RPM range. If you're serious about reliability and extracting maximum performance from your machine, this kit is non-negotiable.

The complete kit includes everything you need for a straightforward rebuild: piston, rings, wrist pin, and circlips. Installation is a standard top-end job—no exotic fabrication required. The 4032 T6 forged aluminum construction provides the strength necessary for high-load applications, while the proprietary skirt coating reduces friction and piston rock, translating to smoother operation and extended component life.

• Compression Ratio: 12.4–13.0:1
• Material: 4032 T6 forged aluminum
• Heat Treatment: T6 thermal hardening
• Skirt Coating: Permanent friction-reducing
• Design Method: FEA-optimized
• Origin: German engineering (Wossner)
• Fitment: Yamaha YFZ450 (2004–2025)
• Installation: Bolt-on top-end rebuild
• Kit Contents: Piston, rings, pin, clips