Cylinder Works Big Bore Cylinder for Yamaha WR450F / YZ450F / YZ450FX - 21005-1

The Cylinder Works Big Bore Cylinder, part number 21005-1, is a new cast-aluminum replacement cylinder designed to increase engine displacement when used with the correct matching big-bore piston and components. It is intended for Yamaha WR450F, YZ450F, and YZ450FX; see the complete vehicle list below.

Features

• Big-bore configuration increases cylinder bore and engine displacement
• New cast-aluminum cylinder with an OEM-style appearance
• Nickel-silicon-carbide electroplated bore provides a durable, oil-retaining surface
• Precision diamond-honed finish supports proper piston-ring seal

What Is Included

• Big-bore cylinder only

Specifications

• Brand: Cylinder Works
• Product Type: Big Bore Cylinder
• Bore Configuration: Big bore
• Construction: Cast aluminum
• Bore Finish: Nickel-silicon-carbide electroplate
• Manufacturer Part Number: 21005-1

Vehicle Fitment

Make: Yamaha

• WR 450 F (2016-2018)
• YZ 450 F (2010-2017)
• YZ 450 FX (2016-2018)

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.