The Wiseco 4865M09500 piston kit features a 95.00mm bore with a 12:1 compression ratio and is compatible with a range of Yamaha YFZ450 models, including the YFZ450R and YFZ450X. This forged high-compression piston is constructed from high-silicon aluminum alloy, offering strength, durability, and performance enhancements.

Features

• Forged piston made from high-silicon aluminum alloy
• High-compression design for increased horsepower and torque
• Includes piston, ring set, wire pin locks, and piston pin
• Engineered for durability and longevity
• Innovative forging and skirt design for maximum performance

Specifications

• Bore: 95.00 mm
• Actual Bore Diameter: 94.95 mm
• Compression Ratio: 12:1
• Construction: Forged
• Part No.: 56-W4865+00A_WI

Cross-Reference OEM Part Numbers

• Piston: 4865M09500

Vehicle Fitments

• Yamaha YFZ450 2004–2013
• Yamaha YFZ450 SE 2007–2008
• Yamaha YFZ450 Bill Balance Edition 2006–2007
• Yamaha YFZ450R 2009–2013
• Yamaha YFZ450R SE 2009–2013
• Yamaha YFZ450X 2011
• Yamaha YFZ450X SE 2011