Cylinder Kit (Big Bore +3mm 478cc) for Yamaha YFZ450

The +3mm Big Bore Complete Cylinder Kit for the 2004–2013 Yamaha YFZ 450 ATV provides a direct bolt-on upgrade, delivering increased displacement without requiring additional machining. Designed to maintain a near-identical appearance to OEM components, this kit is engineered for durability and precision with Nickel Silicon Carbide plating and exact honing for effortless piston installation. It includes all necessary components for a seamless installation.

Features

• Direct bolt-on design; no replating required.
• Nickel Silicon Carbide plating ensures long cylinder life.
• Honed to precise dimensions for easy piston installation.
• Big bore upgrade requires no machining unless specified.
• Complete kit includes all necessary components for installation.

Included Items

• Big bore cylinder (+3mm)
• Piston
• Ring set
• Two circlips
• Gasket set
• Piston pin

Specifications

Displacement: 468cc for 2004–2005 models; 478cc for 2006–2012 models
Compression: Standard
Compatible Piston: Vertex #23403

Compatible with:
Yamaha YFZ450 2004-’09, 2012-‘13