What is a 'Big Bore' kit and what does it do?

A Big Bore kit increases the internal diameter of the cylinder, which increases the engine's displacement. This generally results in more power and torque output from the engine.

What is the benefit of a forged piston with molybdenum coating?

Forged pistons are stronger and more durable than cast pistons, making them better suited for high-performance applications. The molybdenum coating on the piston skirt helps reduce friction, leading to smoother operation and potentially longer engine life.

Can this cylinder kit be shipped to California?

No, this kit is not CARB approved and cannot be shipped to California due to emissions regulations.

Athena

Athena 08-13 Yamaha YZ 250 F Big Bore Complete Cylinder Kit

Name: Athena 08-13 Yamaha YZ 250 F Big Bore Complete Cylinder Kit
Brand: Athena
Price: 992.73 USD
Availability: InStock

$992.73

Worn-out cylinder causes loss of power. This Athena Big Bore Cylinder Kit is a direct fix for your 2008-2013 Yamaha YZ250F.

Key Features

Direct fit — verified for 2008-2013 Yamaha YZ250F
Big Bore Kit — Increases engine displacement for more power
Aluminum Cylinder — Lightweight and durable construction
Galvanic Coating — Designed for improved heat transfer and wear resistance
Forged Piston — Stronger than cast pistons, built to handle higher performance
Molybdenum Coating — Reduces friction for smoother operation and longer life

Fits this vehicle

Yamaha YZ250F 2008-2013

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Product Details

Worn-out cylinder causes loss of power. This Athena Big Bore Cylinder Kit is a direct fix for your 2008-2013 Yamaha YZ250F. It increases displacement for improved performance. This kit includes everything needed to replace the stock cylinder and piston.