PISTON KIT YAM 350 R5 66.00, WOSSNER 8221D200

This piston kit is designed for Yamaha 350 R5 motorcycles produced between 1973 and 1975. It features a single Wossner forged piston with a +2.00mm oversize (66.00mm bore), engineered for durability and optimal performance in two-stroke engines. The elliptical design enhances load distribution and manages heat expansion efficiently, minimising the risk of piston collapse. Manufactured in Germany, this piston offers precise fit and reliability for vintage performance applications.

Features

• Single forged Wossner piston

• +2.00mm oversized bore (66.00mm, actual piston diameter 65.93mm)

• Elliptical shape for uniform pressure distribution and thermal expansion control

• Optimised for efficient combustion heat transfer

• Made in Germany

Specifications

• Part Number: 8221D200

• Bore Size: 66.00mm (actual piston size 65.93mm)

• Oversize: +2.00mm

• 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: RSB6600 x 2

Vehicle Fitments

• Yamaha 350 R5 1973–1975