Cylinder Works Big Bore Cylinder Kit for Yamaha YZ450F 2018-2019 CW21012K01

The Yamaha YZ450F demands peak performance, and factory cylinders often become the bottleneck in a well-tuned build. This Cylinder Works Big Bore Kit delivers measurable power gains without the downtime of custom machine work—you get bolt-on simplicity with race-ready durability. Every component, from the matched Vertex pistons to the Nickel Silicon Carbide plating, is engineered to handle aggressive riding and repeated heat cycles without compromise.

Designed for riders who refuse to leave performance on the table, this kit eliminates guesswork. The complete assembly comes ready to install, meaning you spend less time in the garage and more time on the track or trail.

• Direct bolt-on fitment
• 2018–2019 YZ450F specific
• Vertex piston included
• Nickel Silicon Carbide plating
• No re-plating required
• No machine work needed
• Includes gaskets, rings, pin, clips
• U.S.A. manufactured
• MPN: CW21012K01