PISTON KIT 06-09 YZF WRF450 95, WOSSNER 8631DA HC YZF450, 2S2-11631-20-00

Wossner Pro Series high-compression forged piston kit designed for GasGas ECF450F (2013-2015), Yamaha YZ450F (2006-2009), and WR450F (2006-2009) models. Engineered for superior strength and optimal heat transfer, these pistons feature an elliptical design to ensure uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse. Manufactured in Germany.

Features

• High-compression Pro Series forged piston


• Optimized heat transfer for efficient combustion chamber performance


• Elliptical design for even thrust load distribution and reduced piston collapse


• Manufactured in Germany

Specifications

• Bore Size: 95.00mm


• Actual Bore Diameter: 94.96mm


• Displacement: 449 cm³


• Stroke: 63.40mm


• Clearance: 0.04mm


• Wossner Compression Ratio: 13.50:1


• OEM Compression Ratio: 12.30:1


• Dome Volume: -6.10 cm³


• Compression Height: 23.50mm


• Lock Part Number: CW18


• Pin Part Number: WP053


• Ring Set Part Number: 950ADS-2


• Rod Part Number: P4008

Cross-Reference OEM Part Numbers

• 2S2-11631-20-00

Vehicle Fitments

• GasGas ECF450F (2013-2015)


• Yamaha YZ450F (2006-2009)


• Yamaha WR450F (2006-2009)