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

Dispatch Times

Local Stock: Dispatches in < 24 hours

Parts showing as available at our Warehouse in Gorey ship the same business day if ordered before 1pm. 

Supplier Stock: Dispatches in 2-4 Days

Parts showing as available at our Supplier Warehouse are ordered from our supplier and delivered to us before we can dispatch. More info is available on this page under "Stock Availability".

OEM Special Order: Dispatches in 3-10 Days

This website does not have access to live stock levels from our OEM Suppliers. In most cases the parts will be available but in the case of backordered parts we will notify you. We receive parts from Yamaha in 3-4 days, All others including Honda, Suzuki, Kawasaki, Polaris please allow 7-10 days for us to receive the parts. 

Delivery Times

Ireland & Northern Ireland:

1-2 Days using GLS/An Post

Germany, France, Netherlands, Belgium:

3-5 Days using GLS/Fedex

Italy, Spain & Other EU Countries:

4-7 Days using GLS/Fedex