What is a big bore cylinder kit?

A big bore cylinder kit replaces your stock cylinder with a larger one, increasing the engine's displacement. This generally results in more horsepower and torque.

What is the difference between a forged piston and a cast piston?

Forged pistons are made from a solid piece of aluminum that is heated and hammered into shape. They are stronger and more durable than cast pistons, making them better suited for high-performance applications.

Does this kit come with everything needed for installation?

The kit includes the aluminum cylinder with galvanic coating and a forged piston with molybdenum coating. It is designed as a direct replacement for the stock components. Refer to the manufacturer's installation instructions for any additional hardware or sealants that may be required.

Athena

Athena 01-12 Yamaha WR 250 F Big Bore Complete Cylinder Kit

Name: Athena 01-12 Yamaha WR 250 F Big Bore Complete Cylinder Kit
Brand: Athena
Price: 947.93 USD
Availability: InStock

$947.93

Fits 2001-2012 Yamaha WR250F. Athena big bore cylinder kit with forged piston for improved performance.

Key Features

Direct fit — verified for 2001-2012 Yamaha WR250F and 2001-2007 Yamaha YZ250F
Big Bore Cylinder Kit — Increases engine displacement for more power.
Aluminum Cylinder with Galvanic Coating — Durable construction for longevity.
Forged Piston with Molybdenum Coating — Stronger piston design with reduced friction.
Complete Kit — Includes cylinder and piston for a full engine upgrade.

Fits these vehicles

Yamaha WR250F 2001-2012
Yamaha YZ250F 2001-2007

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Product Details

Athena makes this big bore cylinder kit for the 2001-2012 Yamaha WR250F and 2001-2007 YZ250F. This kit replaces your stock cylinder and piston with larger components to increase engine displacement, giving you more power and torque.

The cylinder is made from aluminum and features a galvanic coating for durability. It comes with a forged piston that has a molybdenum coating. Forged pistons are stronger than cast pistons and can handle higher performance demands. The molybdenum coating helps reduce friction.