PISTON KIT 85-87 YZ80 49.50, WOSSNER 8186D150 YAMAHA MX

This Wossner piston kit is intended for Yamaha YZ80 models from 1985 to 1987 and features a 49.50 mm bore with an actual piston diameter of 49.45 mm. Forged in Germany, the piston is built for high strength and optimised heat transfer from the combustion chamber to the cylinder walls. Its elliptical shape ensures even load distribution under thermal expansion, reducing localised pressure and helping to prevent piston collapse.

Features

• Forged piston construction for enhanced strength

• Engineered for efficient heat dissipation

• Elliptical design supports uniform thrust load distribution

• Manufactured in Germany

Specifications

• Bore size: 49.50 mm

• Actual piston diameter: 49.45 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: 8186D150

• Lock Part Number: CW12

• Pin Part Number: WP091

• Ring Set Part Number: RSB4950

• Alternate Part Number: 56-W520+150.WO

Vehicle Fitments

• Yamaha YZ80 1985

• Yamaha YZ80 1986

• Yamaha YZ80 1987