Wossner 47mm Bore Piston Kit (PN# 8185DA) is designed for Yamaha YZ80 models from 1982 to 1983. This forged piston ensures high strength, efficient heat transfer, and durability. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse. Manufactured in Germany, this piston meets OEM compression standards.

Features

• High-strength forged piston for durability and performance


• Optimized heat transfer for efficient combustion


• Elliptical design prevents piston collapse and ensures even load distribution


• Manufactured in Germany

Specifications

• Bore: 47mm


• Actual diameter: 46.95mm


• Display (cm³): 79


• Stroke (mm): 55.50


• Clearance (mm): 0.05


• Compression Ratio: OEM


• OEM Compression Ratio: 11.10:1


• Dome Volume (cm³): -0.20


• Compression Height (mm): 22.80

Cross-Reference OEM Part Numbers

• Lock: CW12


• Pin: WP091


• Ring Set: RSB4700


• OEM Part Number: 3R1-11630-02-00

Vehicle Fitments

• Yamaha YZ80 (1982-1983)