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