This Wossner piston kit features an 85.50mm bore size (85.42mm actual) and is designed for Yamaha YZ465 (1981–1982) and IT465 (1980–1981) models. Forged in Germany, this piston offers excellent strength and thermal efficiency. The elliptical profile distributes thrust loads evenly during thermal expansion, minimising localised stress and reducing the likelihood of piston failure.

Features

• Forged construction for high strength

• Elliptical design for uniform load distribution under heat

• Promotes efficient combustion chamber heat transfer to cylinder walls

• Manufactured in Germany

Specifications

• Bore Size: 85.50mm (85.42mm)

• Display: 465 cm³

• Stroke: 82.00 mm

• Clearance: 0.08 mm

• Compression Height: 40.00 mm

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

Cross-Reference OEM Part Numbers

• Piston Kit: 8265D050

• Lock: CW18

• Pin: WP042

• Ring Set: RSC8550 x2

• Part No.: 56-W551_0.50.WO

Vehicle Fitments

• Yamaha YZ465 1981

• Yamaha YZ465 1982

• Yamaha IT465 1980

• Yamaha IT465 1981