The Cylinder Works 21009-G01 Top-End Gasket Kit is designed for a reliable standard-bore top-end rebuild on select Yamaha YZ250 two-stroke motorcycles. This kit includes the cylinder, piston kit, and required gaskets, providing a convenient replacement solution for restoring engine performance without sourcing components separately.
Designed to closely match the original equipment cylinder, the Cylinder Works replacement cylinder features a nickel silicon carbide plating for durability, wear resistance, and long service life. The standard-bore design supports a straightforward installation, and no machine work is required when used with compatible components. Replacement standard-bore cylinders, piston kits, and ring sets are also available for future service needs.
Fitment includes 1999–2008 Yamaha YZ250 models. Verify the motorcycle year, engine configuration, and existing top-end components before installation. The manufacturer part number is 21009-G01, and the vendor part number is 21009-G01.
Features:
- Includes cylinder, piston kit, and gaskets
- Standard-bore replacement cylinder, piston, and ring set design
- Cylinder appearance closely matches stock equipment
- Nickel silicon carbide plating supports long service life
- No machine work required for installation
- Fits 1999–2008 Yamaha YZ250 models
Fitment:
1999 Yamaha YZ250
2000 Yamaha YZ250
2001 Yamaha YZ250
2002 Yamaha YZ250
2003 Yamaha YZ250
2004 Yamaha YZ250
2005 Yamaha YZ250
2006 Yamaha YZ250
2007 Yamaha YZ250
2008 Yamaha YZ250
2009 Yamaha YZ250
2010 Yamaha YZ250
2011 Yamaha YZ250
2012 Yamaha YZ250
2013 Yamaha YZ250
2014 Yamaha YZ250
2015 Yamaha YZ250
2016 Yamaha YZ250
2017 Yamaha YZ250
2018 Yamaha YZ250
2019 Yamaha YZ250
2020 Yamaha YZ250
2021 Yamaha YZ250
2022 Yamaha YZ250
2023 Yamaha YZ250
2024 Yamaha YZ250
2025 Yamaha YZ250