Cylinder Works Big Bore Cylinder Kit for Yamaha YFZ450 / YFZ450R / YFZ450R SE & More - 21003-K02

The Cylinder Works Big Bore Cylinder Kit, part number 21003-K02, is a complete displacement-increasing top-end package with a new Cylinder Works big-bore cylinder and matched engine components. It is intended for Yamaha YFZ450, YFZ450R, and YFZ450R SE; see the complete vehicle list below.

Features

• Big-bore configuration increases engine displacement and performance potential
• New cast-aluminum cylinder with a nickel-silicon-carbide electroplated bore
• Precision diamond-honed cylinder finish supports ring seal and oil retention
• Matched Vertex big-bore piston kit is selected for the cylinder and application
• Top-end gasket set provides the required sealing components for installation

What Is Included

• Cylinder Works big-bore cylinder
• Matched Vertex big-bore piston kit
• Top-end gasket kit with required gaskets and O-rings

Specifications

• Brand: Cylinder Works
• Product Type: Big Bore Cylinder Kit
• Bore Configuration: Big bore
• Cylinder Construction: Cast aluminum
• Bore Finish: Nickel-silicon-carbide electroplate
• Manufacturer Part Number: 21003-K02

Vehicle Fitment

Make: Yamaha

• YFZ 450 (2017)
• YFZ 450 R (2009-2023)
• YFZ 450 R SE (2009-2023)
• YFZ 450 X (2010-2011)
• YFZ 450 X Bill Balance Edition (2010)

Fitment and Installation Note: Confirm the complete year, make, model, engine configuration, and manufacturer part number before ordering. Engine assembly should follow the vehicle manufacturer’s specifications, clearances, torque values, and break-in procedures.