What is the bore size of this replacement head?

This Athena replacement head has a 58mm bore size. It is specifically designed for 144cc big bore applications on the Kawasaki KX125 and Yamaha YZ125.

Does this head come with a piston?

Yes, this kit includes a forged piston with a molybdenum coating. The piston is designed to work with the cylinder and head for optimal performance.

Can this part be shipped to California?

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

Athena

Athena 03-07 Kawasaki KX 125 LC 144cc 58mm Replacement Head (1-Piece Design)

Name: Athena 03-07 Kawasaki KX 125 LC 144cc 58mm Replacement Head (1-Piece Design)
Brand: Athena
Price: 154.97 USD
Availability: InStock

$154.97

Fits 1997-2021 Yamaha YZ125 and 2003-2005 Kawasaki KX125. This Athena 144cc, 58mm replacement head is a one-piece design for improved performance.

Key Features

Direct fit — verified for 1997-2021 Yamaha YZ125 and 2003-2005 Kawasaki KX125.
One-piece head design — provides a solid mounting point.
Aluminum cylinder with galvanic coating — offers durability and heat dissipation.
Forged piston with molybdenum coating — built for strength and reduced friction.
58mm bore size — designed for 144cc big bore applications.

Fits these vehicles

Kawasaki KX125 2003-2005
Yamaha YZ125 1997-2021

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Product Details

Already running a 144cc big bore kit? This Athena 58mm replacement head is the next piece. It's a one-piece design built for the Yamaha YZ125 (1997-2021) and Kawasaki KX125 (2003-2005). This head is designed to work with the Athena big bore kit for these models.