Restore dependable top-end performance with the Cylinder Works Standard Bore Cylinder Kit, part number CW20011K01-1. Designed for 2005–2014 Yamaha YZ125 models, this complete kit includes a standard-bore cylinder, matched Vertex piston kit, and the required top-end gaskets for a straightforward replacement. The cylinder is designed to maintain a stock-like appearance while providing the durability needed for motocross and off-road riding.
Each Cylinder Works cylinder is nickel silicon carbide plated to promote extended service life, consistent bore performance, and efficient heat control. The included Vertex piston is matched to the cylinder to support reliable operation, strong performance, and reduced engine noise. This standard-bore kit is intended as a replacement for the original cylinder and is designed to install without machining in applicable applications. Always verify engine condition and follow the manufacturer’s installation procedures before assembly.
Fitment: Fits 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, and 2014 Yamaha YZ125 motorcycles. The top-end gasket kit does not include valve stem seals. Replacement pistons, gaskets, and ring sets are available separately for future service needs. Manufacturer part number CW20011K01-1; vendor part number 422-20011K.
Features:
- Complete standard-bore cylinder kit for Yamaha YZ125 applications
- Includes cylinder, matched Vertex piston kit, and top-end gaskets
- Nickel silicon carbide-plated cylinder supports extended service life
- Stock-like cylinder appearance for an original-equipment-style installation
- Matched piston and cylinder help promote dependable performance and reduced engine noise
- Designed for installation without machining in applicable applications
- Replacement piston, gasket, and ring sets are available separately
- Top-end gasket kit does not include valve stem seals
- Fits 2005–2014 Yamaha YZ125 models
- Brand: Cylinder Works
- Manufacturer part number: CW20011K01-1
- Vendor part number: 422-20011K
Fitment:
2005 Yamaha YZ125
2006 Yamaha YZ125
2007 Yamaha YZ125
2008 Yamaha YZ125
2009 Yamaha YZ125
2010 Yamaha YZ125
2011 Yamaha YZ125
2012 Yamaha YZ125
2013 Yamaha YZ125
2014 Yamaha YZ125
2015 Yamaha YZ125
2016 Yamaha YZ125
2017 Yamaha YZ125
2018 Yamaha YZ125
2019 Yamaha YZ125
2020 Yamaha YZ125
2020 Yamaha YZ125X
2021 Yamaha YZ125
2021 Yamaha YZ125X
2022 Yamaha YZ125X