What is a big bore cylinder kit?

A big bore cylinder kit replaces your stock cylinder with a larger one, increasing the engine's displacement. This Athena kit bumps your CRF250R or CRF250X to 280cc, which generally results in more torque and horsepower.

What is included in this kit?

This kit includes the aluminum cylinder, a forged piston with a molybdenum coating, and the necessary gasket kit to install it.

Does this kit require other modifications?

While this kit can be installed on a stock engine, you'll see the best results when paired with other performance upgrades like an aftermarket exhaust and intake system. Proper tuning may also be recommended.

Athena

Athena 04-09 Honda CRF 250 R 280cc 82mm Big Bore Cylinder Gasket Kit

Name: Athena 04-09 Honda CRF 250 R 280cc 82mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 86.87 USD
Availability: InStock

$86.87

Fits 2004-2009 Honda CRF250R and CRF250X. Athena 280cc big bore cylinder kit with forged piston for improved performance.

Key Features

Direct fit — verified for 2004-2009 Honda CRF250R and CRF250X
280cc displacement — increases engine size for more power
Forged piston with molybdenum coating — built for durability and reduced friction
Aluminum cylinder with galvanic coating — lightweight and wear-resistant

Fits these vehicles

Honda CRF250R 2004-2009
Honda CRF250X 2004-2009

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Product Details

Already running a performance exhaust and intake on your 2004-2009 Honda CRF250R or CRF250X? This Athena 280cc big bore cylinder kit is the next piece to unlock more power. It increases displacement to 280cc, giving you a noticeable boost in torque and horsepower.