Wossner forged piston kit designed for European Yamaha XT500, TT500, and SR500 models from 1976 to 1989. Manufactured in Germany, this piston offers superior strength and heat transfer efficiency. The elliptical design ensures even load distribution, reducing localized pressure and preventing piston collapse.

Features

• Forged construction for enhanced durability and strength


• Optimized heat transfer for improved performance


• Elliptical design for uniform bearing surface and reduced wear


• Designed for 4-stroke engines

Specifications

• Bore Size: 87.00 mm


• Actual Bore: 86.93 mm


• Stroke: 84.00 mm


• Clearance: 0.07 mm


• Compression Height: 29.00 mm


• Dome Volume: +13.70 cm³


• Compression Ratio: 9.80:1 (OEM: 9.00:1)


• Displacement: 449 cm³


• Made in Germany

Cross-Reference OEM Part Numbers

• Wossner Part No.: 8505DA


• Lock P/N: CW20


• Pin P/N: WP052


• Ring Set P/N: 870XSY

Vehicle Fitments

• Yamaha XT500 (1976-1989) [European models]


• Yamaha TT500 (1976-1989) [European models]


• Yamaha SR500 (1976-1989) [European models]