Upgrade the top end of your compatible Yamaha four-stroke with the Cylinder Works 20002-K01 standard bore high-compression cylinder kit. Designed for a 77.00 mm bore and a 12.7:1 compression ratio, this complete kit includes the cylinder, piston kit, and required gaskets for a reliable engine rebuild. The cylinder maintains a stock-style appearance while providing the durability and performance expected from Cylinder Works components.
Each kit is matched with a Vertex piston to support long service life, consistent performance, and reduced engine noise. The cylinder features a nickel silicon carbide plating process that helps improve wear resistance and longevity. No machine work is needed for installation when used with the appropriate application and supporting components. The included top-end gasket kit does not include valve stem seals, so inspect existing seals and replace them as required during installation.
This Cylinder Works kit fits 2001–2004 Yamaha YZ250F models and 2001–2004 Yamaha WR250F models, including the 2001 Yamaha YZ250F, 2002 Yamaha YZ250F, 2003 Yamaha YZ250F, 2004 Yamaha YZ250F, 2001 Yamaha WR250F, 2002 Yamaha WR250F, 2003 Yamaha WR250F, and 2004 Yamaha WR250F. Replacement pistons, gaskets, and ring sets are available separately for future service needs. Confirm model year, bore specification, and engine configuration before ordering.
Features:
- Complete 77.00 mm standard bore high-compression cylinder kit
- 12.7:1 compression ratio for compatible Yamaha applications
- Includes cylinder, Vertex piston kit, and gaskets
- Nickel silicon carbide-plated cylinder for improved durability and longer service life
- Stock-style cylinder appearance
- Matched piston and cylinder design helps reduce engine noise
- No machine work needed for the specified applications
- Top-end gasket kit does not include valve stem seals
- Replacement pistons, gaskets, and ring sets available
- Fits 2001–2004 Yamaha YZ250F and 2001–2004 Yamaha WR250F models
- Brand: Cylinder Works
- Manufacturer part number: 20002-K01
- Vendor part number: 422-20002K
Fitment:
2001 Yamaha WR250F
2001 Yamaha YZ250F
2002 Yamaha WR250F
2002 Yamaha YZ250F
2003 Yamaha WR250F
2003 Yamaha YZ250F
2004 Yamaha WR250F
2004 Yamaha YZ250F