Big Bore Cylinder Kit Ø85mm | 290cc

Upgrade your Honda CRF 250R 2022–2024 with the Athena Big Bore cylinder kit featuring GET Boost technology, engineered to increase displacement and deliver a stronger, faster‑responding, and more enjoyable power delivery across the entire RPM range.

Developed for riders looking for enhanced torque, quicker acceleration, and a more assertive feel out of corners, this kit combines Athena’s racing‑grade engineering with the refined performance characteristics of Honda’s 2022–2024 250 platform.

Stronger torque, quicker acceleration

The kit includes a big bore aluminum cylinder manufactured from a high‑silicon alloy with an integrated steel liner for improved heat stability and efficient combustion, even during extended high‑load sessions.
The high‑performance forged piston, complete with pin and rings, is engineered to match the increased bore size, ensuring optimal sealing, reduced friction, and long‑term durability.

The result is a more responsive engine with stronger torque, sharper acceleration, and improved throttle precision in technical or high‑intensity track sections.

GET Boost electronic module included

Supplied with the kit is the GET Boost module, developed by GET – Athena’s electronics division. Preconfigured specifically for the CRF 250R 2022–2024 Big Bore setup, it enhances fueling and combustion management without requiring ECU replacement or modifications.

Plug‑and‑play installation

The GET wiring harness connects directly to the injector and throttle body connectors for a fast, non‑invasive installation. The dedicated Boost calibration ensures safe, consistent performance with a power curve optimized for the new cylinder.

Athena racing‑grade engineering

The CNC‑machined forged piston provides reduced friction and superior mechanical strength, while the high‑strength piston pin ensures reliability under increased loads. All components follow Athena’s proven racing‑derived manufacturing standards.

Complete kit, ready to assemble

All required gaskets are included, enabling professional installation within OEM Honda tolerances.

The Athena Big Bore cylinder kit with GET Boost is the perfect upgrade for riders seeking a more powerful, more responsive, and more exhilarating Honda CRF 250R 2022–2024.