Wössner 49mm forged piston kit designed for Yamaha YZ80 models from 1976 to 1980. Engineered for optimal combustion chamber heat transfer and uniform load distribution, reducing localized pressure and preventing piston collapse. Made in Germany for durability and performance.

Features

• Forged construction for superior strength and durability


• Optimized heat transfer to cylinder walls


• Elliptical design ensures uniform bearing surface under heat expansion


• Reduces localized pressure and evenly distributes thrust loads


• Prevents piston collapse under high-stress conditions

Specifications

• Bore Size: 49mm


• Wössner Part Number: 8183DA


• Lock Part Number: CW12


• Pin Part Number: WP091


• Ring Set Part Number: RSB4900


• Displacement: 79 cm³


• Stroke: 42.00mm


• Clearance: 0.05mm


• Compression Ratio: 2-stroke


• Compression Height: 29.50mm

Cross-Reference OEM Part Numbers

• Not specified

Vehicle Fitments

• Yamaha YZ80 (1976-1980)