What is a big bore cylinder kit?

A big bore cylinder kit replaces your stock cylinder and piston with larger ones. This increases the engine's displacement, which typically results in more horsepower and torque.

What materials are used in this kit?

The kit includes an aluminum cylinder with a galvanic coating and a forged piston with a molybdenum coating. These materials are chosen for their strength and wear resistance in high-performance engines.

Does this kit come with all necessary parts for installation?

This kit includes the aluminum cylinder and the forged piston. It is recommended to consult the manufacturer's installation guide for a complete list of required components and procedures.

Athena

Athena 15-18 Yamaha WR 250 F Big Bore Complete Cylinder Kit

Name: Athena 15-18 Yamaha WR 250 F Big Bore Complete Cylinder Kit
Brand: Athena
Price: 926.43 USD
Availability: InStock

$926.43

Fits 2014-2018 Yamaha YZ250F and 2015-2018 WR250F. Athena big bore cylinder kit for improved engine performance.

Key Features

Big Bore Cylinder Kit — Increases engine displacement for more power.
Aluminum Cylinder — Lightweight and durable construction.
Galvanic Coating — Applied to the cylinder for improved wear resistance.
Forged Piston — Stronger than cast pistons, designed to handle higher stresses.
Molybdenum Coating — Applied to the piston skirt to reduce friction.
Direct fit — Verified for Yamaha WR250F (2015-2018) and YZ250F (2014-2018).

Fits these vehicles

Yamaha WR250F 2015-2018
Yamaha YZ250F 2014-2018

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Product Details

You get an aluminum cylinder with a forged piston in this Athena Big Bore Complete Cylinder Kit. This kit replaces your stock cylinder and piston to give your Yamaha WR250F or YZ250F more displacement, which generally means more power. It’s built for riders looking to get more out of their engine.

The cylinder is made from aluminum and features a galvanic coating. The included forged piston has a molybdenum coating. These materials and coatings are chosen for durability and performance under demanding engine conditions.