The +3mm Big Bore Complete Cylinder Works Kit increases engine displacement to 478cc for Yamaha WR450F and YZ450F models. This direct bolt-on kit requires no replating or additional machining, offering a ready-to-install solution with OEM-like performance and quality.

Features:

• Increases displacement to 478cc with a +3mm big bore cylinder.
• Direct bolt-on replacement with no additional machining required.
• Nickel Silicon Carbide plated for durability and long life.
• Precisely honed for straightforward piston installation.
• Complete kit includes all necessary components for installation.

Included Components:

• Cylinder
• Piston
• Gasket set
• Piston pin
• Circlips (2)
• Ring set

Specifications:

• Displacement: 478cc
• Compression: Standard
• Piston type: Vertex #23404

Vehicle Fitments:

• Yamaha WR450F: 2003–2006
• Yamaha YZ450F: 2003–2005