This Wossner piston kit is specifically engineered for Harley Davidson Twin Cam 88" Big Bore engines (103 cu. in.) from 1999 to 2012. With a 3.872" bore oversized by +0.005", the domed pistons provide a 10:1 compression ratio, offering high durability and optimal thermal performance for demanding engine conditions.

Features

• Forged high-performance pistons (2 pcs), skirt-coated for friction reduction and extended service life

• Engineered for effective heat transfer from the combustion chamber to cylinder walls

• Elliptical design ensures even pressure distribution under thermal expansion, reducing the risk of piston collapse

• Domed piston configuration with 10:1 compression ratio

• Manufactured in Germany

• Includes rings, clips, and pins

Specifications

• Bore size: 3.872" (+0.005" oversize)

• Compression ratio: 10:1

• Piston type: Forged, skirt-coated, domed

• Quantity: 2 pistons per kit

• Wossner Part Number: K8856D015-2

• Alternate Part No: 56-W9966.015.WO

Vehicle Fitments

• Harley Davidson Twin Cam 88" Big Bore (103 cu. in.), years 1999–2012