Piston Kit 85-87 YZ80 48.50, Wossner 8186D050 Yamaha MX

This Wossner piston kit is designed for Yamaha YZ80 models from 1985 to 1987, featuring a 48.50 mm bore and an actual piston diameter of 48.45 mm. Manufactured in Germany, the piston is forged for improved strength and thermal efficiency. Its elliptical design ensures a consistent bearing surface under thermal expansion, promoting even distribution of thrust loads and reducing localised pressure to prevent piston collapse.

Features

• Forged piston for increased strength and durability

• Engineered for effective combustion heat transfer

• Elliptical design provides uniform load distribution

• Manufactured in Germany

Specifications

• Bore size: 48.50 mm

• Actual piston diameter: 48.45 mm

• Display (cm³): 82

• Stroke: 45.60 mm

• Clearance: 0.05 mm

• Compression height: 26.80 mm

• Wossner compression ratio: 2-stroke

• OEM compression ratio: 2-stroke

Cross-Reference OEM Part Numbers

• Wossner Piston Part Number: 8186D050

• Lock Part Number: CW12

• Pin Part Number: WP091

• Ring Set Part Number: RSB4850

• Alternate Part Number: 56-W520+050.WO

Vehicle Fitments

• Yamaha YZ80 1985

• Yamaha YZ80 1986

• Yamaha YZ80 1987