The Cylinder Works 20009-K01 Cylinder Kit is a complete standard-bore top-end replacement designed for Yamaha YZ250 two-stroke motorcycles from 1999 through 2008. This kit includes the cylinder, matched piston kit, piston rings, and required gaskets for a dependable engine rebuild. Its standard-bore configuration is intended as a direct replacement for the original cylinder, helping restore performance without requiring additional machine work.
Manufactured by Cylinder Works and supplied under vendor part number 20009-K01, the cylinder is nickel-silicon-carbide plated for extended service life, consistent heat transfer, and durable performance. The exterior is designed to closely match the stock appearance, making it a practical choice for repairs, maintenance, or restoration applications. The included Vertex piston is matched to the cylinder to support longevity, performance, and reduced engine noise.
Fitment includes 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, and 2008 Yamaha YZ250 models. The top-end gasket kit does not include valve stem seals, so those seals should be inspected and replaced separately as needed. Replacement piston, gasket, and ring sets are available for future servicing. Verify the motorcycle year and standard-bore application before installation.
Features:
- Complete standard-bore cylinder kit for Yamaha YZ250 models
- Includes cylinder, Vertex piston kit, piston rings, and gaskets
- Nickel-silicon-carbide plating helps provide extended cylinder life
- Matched Vertex piston supports longevity, performance, and reduced engine noise
- Stock-style cylinder appearance
- Standard-bore replacement requires no machine work in typical installation
- Top-end gasket kit does not include valve stem seals
- Replacement piston, gasket, and ring sets are available
- Fits 1999-2008 Yamaha YZ250 motorcycles
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