Cylinder Works Big Bore Cylinder for Yamaha WR250F / YZ250F / YZ250FX - 21010-1

The Cylinder Works Big Bore Cylinder, part number 21010-1, 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 WR250F, YZ250F, and YZ250FX; 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: 21010-1

Vehicle Fitment

Make: Yamaha

• WR 250 F (2015-2019)
• YZ 250 F (2014-2018)
• YZ 250 FX (2015-2019)

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.