What is the bore size for this kit?

This Athena big bore cylinder gasket kit features a 72mm bore size. This allows for an increase in engine displacement to 293cc.

What is the piston coated with?

The forged piston included in this kit has a molybdenum coating. This coating helps with durability and performance.

Does this kit include everything needed for the big bore conversion?

This kit includes the big bore cylinder gasket and a forged piston. It is designed to work with your existing engine components for the displacement increase.

Athena

Athena 03-24 Yamaha YZ250 LC 293cc 72mm Big Bore Cylinder Gasket Kit

Name: Athena 03-24 Yamaha YZ250 LC 293cc 72mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 27.74 USD
Availability: InStock

$27.74

Fits 2003-2022 Yamaha YZ250. This Athena big bore cylinder gasket kit lets you increase displacement to 293cc with a 72mm bore.

Key Features

Direct fit — verified for 2003-2022 Yamaha YZ250
Increases engine displacement to 293cc
Features a 72mm bore size
Includes aluminum cylinder with galvanic coating
Comes with a forged piston that has a molybdenum coating

Fits this vehicle

Yamaha YZ250 2003-2022

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Product Details

You get a big bore cylinder gasket kit in this Athena P400485160183 kit. This kit allows you to increase the displacement of your 2003-2022 Yamaha YZ250 to 293cc using a 72mm bore. It's designed to work with the stock engine configuration.