PISTON KIT YAM 350 R5 65.00, WOSSNER 8221D100

This piston kit is designed for Yamaha 350 R5 motorcycles produced between 1973 and 1975. It includes a single Wossner forged piston with a +1.00mm oversize (65.00mm bore), offering enhanced strength and thermal stability. The elliptical piston design promotes even pressure distribution under heat expansion, reducing the risk of collapse. Manufactured in Germany, this piston is suitable for high-performance two-stroke engine applications.

Features

• Single forged Wossner piston

• +1.00mm oversized bore (65.00mm, actual piston diameter 64.93mm)

• Elliptical shape for even load and pressure distribution

• Designed for improved combustion heat dissipation

• Made in Germany

Specifications

• Part Number: 8221D100

• Bore Size: 65.00mm (actual piston size 64.93mm)

• Oversize: +1.00mm

• 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: RSB6500 x 2

Vehicle Fitments

• Yamaha 350 R5 1973–1975