The Cylinder Works 20003-K02HC high-compression standard bore cylinder kit is designed to restore and enhance top-end performance on select Yamaha sport ATVs. This complete kit includes a standard bore cylinder, Vertex high-compression piston kit, and the necessary top-end gaskets for a streamlined installation. With a 13.0:1 compression ratio, it is engineered to support strong performance while maintaining dependable operation for recreational, racing, and performance-focused applications.
The cylinder features a stock-style appearance and nickel silicon carbide plating for improved wear resistance, heat management, and extended service life. The cylinder, piston, and components are matched to promote longevity, consistent performance, and reduced engine noise. No machining is required for installation when used with the applicable engine and supporting components, helping simplify the rebuild process. The top-end gasket kit does not include valve stem seals, so those should be inspected and replaced separately as needed.
This Cylinder Works kit fits 2009–2017 Yamaha YFZ450R models and the 2010 Yamaha YFZ450X. It is intended as a high-compression standard bore replacement and performance upgrade for compatible engines. Replacement pistons, gaskets, and ring sets are available separately to support future maintenance. Verify model year, engine configuration, compression requirements, and clearance specifications before installation.
Features:
- Complete high-compression standard bore kit
- Includes cylinder, Vertex piston kit, and top-end gaskets
- 13.0:1 compression ratio for enhanced engine performance
- Standard bore configuration for compatible Yamaha YFZ450R and YFZ450X engines
- Nickel silicon carbide plated cylinder for extended durability and wear resistance
- Stock-style cylinder appearance
- Matched Vertex piston components help promote longevity, performance, and reduced engine noise
- No machining required for applicable installations
- Top-end gasket kit does not include valve stem seals
- Fits 2009–2017 Yamaha YFZ450R and 2010 Yamaha YFZ450X
Fitment:
2009 Yamaha YFZ450R
2009 Yamaha YFZ450R SE
2010 Yamaha YFZ450R
2010 Yamaha YFZ450R SE
2010 Yamaha YFZ450X
2011 Yamaha YFZ450R
2011 Yamaha YFZ450R SE
2011 Yamaha YFZ450X
2012 Yamaha YFZ450R
2012 Yamaha YFZ450R SE
2013 Yamaha YFZ450R
2013 Yamaha YFZ450R SE
2014 Yamaha YFZ450R
2014 Yamaha YFZ450R SE
2015 Yamaha YFZ450R
2015 Yamaha YFZ450R SE
2016 Yamaha YFZ450R
2016 Yamaha YFZ450R SE
2017 Yamaha YFZ450R
2017 Yamaha YFZ450R SE
2018 Yamaha YFZ450R
2018 Yamaha YFZ450R SE
2019 Yamaha YFZ450R
2019 Yamaha YFZ450R SE
2020 Yamaha YFZ450R
2020 Yamaha YFZ450R SE
2021 Yamaha YFZ450R
2022 Yamaha YFZ450R
2022 Yamaha YFZ450R SE
2023 Yamaha YFZ450R
2023 Yamaha YFZ450R SE
2024 Yamaha YFZ450R
2025 Yamaha YFZ450R