What is the main benefit of a big bore kit?

A big bore kit increases the engine's displacement, meaning it can burn more fuel and air with each combustion cycle. This generally results in more torque and horsepower for your ATV.

What does the galvanic coating on the cylinder do?

The galvanic coating on the aluminum cylinder helps improve its durability and wear resistance. It also aids in heat dissipation, which is important for engine performance.

Does this kit come with everything needed for installation?

The kit includes the aluminum cylinder and a forged piston with molybdenum coating. You will need to consult the manufacturer's instructions for any additional components or hardware required for installation.

Athena

Athena 04-11 Yamaha YFZ 450 S 98mm 478cc Big Bore Cylinder Kit

Name: Athena 04-11 Yamaha YFZ 450 S 98mm 478cc Big Bore Cylinder Kit
Brand: Athena
Price: 680.92 USD
Availability: InStock

$680.92

Fits 2004-2011 Yamaha YFZ450. This Athena big bore cylinder kit increases displacement to 478cc for more power.

Key Features

Direct fit — verified for 2004-2011 Yamaha YFZ450
Big Bore Kit — Increases engine displacement to 478cc from stock for more power
Aluminum Cylinder — Lightweight and durable construction with a galvanic coating
Forged Piston — Includes a forged piston with a molybdenum coating for reduced friction and improved longevity
Athena Brand — A well-known name in performance ATV parts

Fits this vehicle

Yamaha YFZ450 2004-2011

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Product Details

Doing a big bore upgrade on your 2004-2011 Yamaha YFZ450? This Athena 478cc Big Bore Cylinder Kit (Part# P400485100016) is built to give your ATV more grunt. It replaces your stock cylinder with a larger one, increasing displacement for improved torque and horsepower.

This kit uses an aluminum cylinder with a galvanic coating for durability. It comes with a forged piston that has a molybdenum coating, which helps reduce friction and wear.