PISTON KIT YAM 350 R5 64.50, WOSSNER 8221D050

This piston kit is designed for Yamaha 350 R5 motorcycles manufactured between 1973 and 1975. It includes a single Wossner forged piston with a +0.50mm oversize, offering improved performance and durability. Engineered with an elliptical profile, the piston enhances heat transfer and distributes mechanical loads evenly, reducing the risk of piston collapse under thermal expansion. Manufactured in Germany, this kit is built to meet the demands of two-stroke engine performance.

Features

• Single forged Wossner piston

• +0.50mm oversized bore (64.50mm, actual piston diameter 64.43mm)

• Elliptical design for uniform pressure distribution

• Engineered for effective heat dissipation

• Made in Germany

Specifications

• Part Number: 8221D050

• Bore Size: 64.50mm (actual piston size 64.43mm)

• Oversize: +0.50mm

• Displacement: 347cm³

• Stroke: 54.00mm

• Clearance: 0.07mm

• Wossner Compression Ratio: 2-stroke

• OEM Compression Ratio: 2-stroke

• Compression Height: 36.00mm

Cross-Reference OEM Part Numbers

• Clips: CW16

• Piston Pin: WP027

• Rings: RSB6450 x 2

Vehicle Fitments

• Yamaha 350 R5 1973–1975