PISTON KIT SET/4 R1, FZR, RX1, WOSSNER K8840D200-4 YAMAHA

This piston kit is designed for Yamaha R1, FZR, and RX1 models from 1999 to 2005. It features a set of four Wossner forged pistons with a +2.00mm oversize (76.00mm bore), engineered to deliver increased displacement and enhanced performance. With an elliptical design, the pistons maintain uniform pressure under thermal expansion, improving durability and reducing the risk of mechanical failure. Manufactured in Germany, this kit increases engine displacement to 1051cc.

Features

• Set of 4 forged Wossner pistons

• +2.00mm oversized bore (76.00mm, actual piston diameter 75.95mm)

• Elliptical design for consistent thrust load distribution and thermal expansion control

• Engineered for efficient combustion heat transfer to cylinder walls

• Made in Germany

Specifications

• Part Number: K8840D200-4

• Bore Size: 76.00mm (actual piston size 75.95mm)

• Displacement: 1051cc

• Displacement Range Displayed: 998 / 1024 / 1051 cm³

• Stroke: 58.00mm

• Clearance: 0.05mm

• Wossner Compression Ratio: 10.20:1

• OEM Compression Ratio: 11.80:1

• Dome Volume: -2.60cm³

• Compression Height: 22.80mm

Cross-Reference OEM Part Numbers

• Clip: CW17

• Piston Pin: WP083

• Replacement Ring Set: 760XDS

Vehicle Fitments

• Yamaha R1 1999–2003

• Yamaha FZR 1999–2003

• Yamaha RX1 2001–2005