What is a big bore kit and why would I want one?

A big bore kit increases the engine's displacement by using a larger piston and cylinder. This generally results in more horsepower and torque, giving your bike more power.

Does this piston kit come with everything needed for installation?

This kit includes the forged piston and the aluminum cylinder. You will need to ensure you have a compatible Athena cylinder kit, and other standard engine rebuild components like gaskets and rings, which are sold separately.

Can this kit be used with a stock Kawasaki cylinder?

No, this piston kit is specifically designed for use with Athena cylinder kits. Using it with a stock cylinder or a cylinder from another manufacturer is not recommended and may cause fitment issues or engine damage.

Athena

Athena 09-18 Kawasaki KX 450 Complete Big Bore Cylinder Forged Piston (For Athena Cyl Kit)

Name: Athena 09-18 Kawasaki KX 450 Complete Big Bore Cylinder Forged Piston (For Athena Cyl Kit)
Brand: Athena
Price: 237.08 USD
Availability: InStock

$237.08

Fits 2009-2015 Kawasaki KX450F. This Athena big bore forged piston kit is for use with Athena cylinder kits, offering an improved setup for your engine.

Key Features

Direct fit — verified for 2009-2015 Kawasaki KX450F
Forged piston with molybdenum coating — offers durability and reduced friction
Aluminum cylinder with galvanic coating — designed for efficient heat transfer and wear resistance
Big bore size — increases engine displacement for more power
For Athena cylinder kits — ensures proper fitment and performance when used with compatible Athena cylinders

Fits this vehicle

Kawasaki KX450F 2009-2015

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Product Details

Doing a big bore engine build on your 2009-2015 Kawasaki KX450F? This Athena forged piston kit is designed to work with Athena cylinder kits. It's a key piece for increasing your engine's displacement and power.