The Cylinder Works 20001-K02 Standard Bore Cylinder Kit is designed for select Yamaha YZ450F and WR450F motorcycles. This complete high-compression top-end kit includes a standard-bore nickel silicon carbide plated cylinder, matched Vertex piston kit, and the required gaskets for a reliable engine rebuild. With a 12.5:1 compression ratio, the kit is engineered to support strong performance while maintaining the stock-style appearance of the original cylinder.
Each component is carefully matched to promote longevity, consistent performance, and reduced engine noise. The plated cylinder provides extended service life and dependable wear resistance, while the included piston and ring set are designed to work together for proper fit and operation. The standard-bore configuration is intended as a direct replacement application, and no machine work is needed for installation when used with the specified fitment.
Fitment: Fits 2003–2005 Yamaha YZ450F, 2003–2005 Yamaha WR450F, and 2006 Yamaha WR450F models. The Cylinder Works manufacturer part number is 20001-K02. The top-end gasket kit does not include valve stem seals. Replacement pistons, gaskets, and ring sets are available separately for future service needs.
Features:
- Complete standard-bore high-compression cylinder kit
- Includes cylinder, matched Vertex piston kit, and gaskets
- 12.5:1 compression ratio supports enhanced engine performance
- Nickel silicon carbide plated cylinder promotes extended service life
- Stock-style cylinder appearance for an original-equipment look
- Matched components help promote longevity, performance, and reduced engine noise
- No machine work needed for specified applications
- Direct standard-bore replacement cylinder configuration
- Top-end gasket kit does not include valve stem seals
- Fits 2003–2005 Yamaha YZ450F, 2003–2005 Yamaha WR450F, and 2006 Yamaha WR450F
- Brand: Cylinder Works
- Manufacturer part number: 20001-K02
- Vendor part number: 422-20001K2
Fitment:
2003 Yamaha WR450F
2003 Yamaha YZ450F
2004 Yamaha WR450F
2004 Yamaha YZ450F
2005 Yamaha WR450F
2005 Yamaha YZ450F
2006 Yamaha WR450F