Upgrade the top end of your Yamaha YFZ450 with the Cylinder Works 20001-K01 standard bore cylinder kit. Designed for 2004–2009 and 2012–2013 Yamaha YFZ450 models, this complete kit includes the cylinder, piston kit, and gaskets needed for a straightforward replacement or engine refresh. The standard bore configuration maintains the original cylinder specification while providing dependable performance and fitment.
The kit is matched with a Vertex piston to support long service life, consistent performance, and reduced engine noise. Its 12.0:1 compression ratio is suited to riders seeking responsive engine operation without changing to a larger displacement setup. The cylinder is styled to closely match the original equipment appearance, making it a practical choice for repairs, restoration, or performance-oriented maintenance.
Manufactured by Cylinder Works, the cylinder features a nickel silicon carbide plating process for improved durability and extended service life. No machine work is needed for installation when used as intended, helping simplify the replacement process. The top-end gasket kit is included but does not contain valve stem seals. Replacement pistons, gaskets, and ring sets are available separately for future servicing. Verify the motorcycle model and year before ordering to ensure proper fitment.
Fitment: 2004–2009 and 2012–2013 Yamaha YFZ450
Manufacturer: Cylinder Works
Vendor Part Number: 20001-K01
Features:
- Complete standard bore cylinder kit for Yamaha YFZ450 applications
- Includes cylinder, piston kit, and gaskets
- 12.0:1 compression ratio for responsive engine performance
- Matched with a Vertex piston for durability, performance, and reduced engine noise
- Nickel silicon carbide plated cylinder for extended service life
- Stock-style cylinder appearance
- No machine work needed when installed as intended
- Top-end gasket kit does not include valve stem seals
- Replacement pistons, gaskets, and ring sets are available
- Fits 2004–2009 and 2012–2013 Yamaha YFZ450 models
Fitment:
2004 Yamaha YFZ450
2005 Yamaha YFZ450
2006 Yamaha YFZ450
2007 Yamaha YFZ450
2008 Yamaha YFZ450
2009 Yamaha YFZ450
2012 Yamaha YFZ450
2013 Yamaha YFZ450