PISTON KIT 88-92 YZ80 49.50, WOSSNER 8187D150 YAMAHA MX

The Wossner 8187D150 piston kit is designed for Yamaha YZ80 models from 1988 to 1992, featuring a 49.50 mm bore for +1.50 mm oversize applications. Manufactured in Germany with a forged construction, this piston offers superior durability and thermal efficiency. The elliptical profile ensures even load distribution under heat expansion, reducing localised stress and preventing piston collapse. This complete kit includes all essential components for accurate and dependable engine restoration.

Features

• Forged piston offers high strength and thermal performance

• Optimised for effective heat dissipation from the combustion chamber

• Elliptical design distributes thrust loads evenly during expansion

• Prevents localised pressure buildup and reduces risk of failure

• Precision-engineered and manufactured in Germany

Specifications

• Bore Size: 49.50 mm

• Actual Bore Diameter: 49.45 mm

• Stroke: 45.60 mm

• Display Displacement: 82 cm³

• Clearance: 0.05 mm

• Compression Ratio (Wossner and OEM): 2-stroke

• Compression Height: 27.00 mm

Cross-Reference Wossner Part Numbers

• Piston Kit: 8187D150

• Lock: CW12

• Pin: WP091

• Ring Set: RSB4950

• Part No.: 56-W569+150.WO

Vehicle Fitments

• Yamaha YZ80 (1988–1992)