Cylinder Kit YFZ450R 09-18, Works Cylinder 21003-K02 Big Bore, 2009 - 2017 Yamaha YFZ 450R ATV,2010 - 2011 Yamaha YFZ 450X ATV

Cylinder Works +3mm Big Bore Complete Cylinder Kit for the 2009-2018 Yamaha YFZ450R and 2010-2011 Yamaha YFZ450X increases displacement to 478cc. This direct bolt-on upgrade requires no re-plating and includes all necessary components for installation, featuring a matched Vertex piston for durability and performance.

Features

• Direct bolt-on installation with no additional machining required
• Nickel Silicon Carbide plated for extended lifespan
• Honed to exact size for easy piston installation
• Big bore cylinders do not require additional machine work (unless specified)
• Includes all necessary components for installation

Included Items

• Cylinder
• Piston assembly
• Top-end gasket set

Specifications

• Bore: +3mm
• Displacement: 478cc
• Uses Vertex Piston #23403

Cross-Reference OEM Part Numbers

• YAMAHA: 2S2-11311-10-00

Vehicle Fitments

• 2009 Yamaha YFZ450R
• 2010 Yamaha YFZ450R
• 2011 Yamaha YFZ450R
• 2012 Yamaha YFZ450R
• 2013 Yamaha YFZ450R
• 2014 Yamaha YFZ450R
• 2015 Yamaha YFZ450R
• 2016 Yamaha YFZ450R
• 2017 Yamaha YFZ450R
• 2018 Yamaha YFZ450R
• 2009 Yamaha YFZ450RSE Special Edition
• 2010 Yamaha YFZ450RSE Special Edition
• 2011 Yamaha YFZ450RSE Special Edition
• 2012 Yamaha YFZ450RSE Special Edition
• 2013 Yamaha YFZ450RSE Special Edition
• 2014 Yamaha YFZ450RSE Special Edition
• 2015 Yamaha YFZ450RSE Special Edition
• 2016 Yamaha YFZ450RSE Special Edition
• 2017 Yamaha YFZ450RSE Special Edition
• 2018 Yamaha YFZ450RSE Special Edition
• 2010 Yamaha YFZ450X
• 2011 Yamaha YFZ450X
• 2010 Yamaha YFZ450XBB Bill Balance Edition
• 2011 Yamaha YFZ450X SE