SKU:227212
Take your Honda CRF 250R to the next performance level with the Athena Big Bore cylinder kit featuring GET Boost technology, engineered to deliver a stronger, more responsive, and more enjoyable power delivery across the entire rpm range. Designed for riders seeking increased mid‑range torque, quicker throttle reaction, and a more assertive power curve, this kit combines Athena’s racing‑grade engineering with the advanced architecture of Honda’s latest 250 platform. The Athena Big Bore cylinder kit with GET Boost is the ideal upgrade for riders wanting a more powerful, more responsive, and more exhilarating Honda CRF250R.
More torque, quicker acceleration, better control
The kit includes a big bore aluminum cylinder made from a high‑silicon alloy with an integrated steel liner, ensuring excellent thermal stability and efficient combustion under sustained racing loads. The high‑performance forged piston, supplied with pin and rings, is precisely engineered to match the increased bore and maintain durability, smoothness, and optimal sealing.
The outcome is a more responsive engine with stronger torque, improved acceleration, and faster throttle reaction during corner exits, rhythm sections, and technical track conditions.
GET Boost electronic module included
The kit comes with the GET Boost electronic module, developed by GET, Athena’s in‑house electronics division. Preconfigured specifically for the CRF 250R Big Bore setup, it enhances combustion and fueling strategies without requiring ECU replacement or modifications.
Plug‑and‑play installation and seamless integration
The GET wiring harness connects directly to the injector and throttle body connectors, offering a quick, non‑invasive installation. The dedicated Boost calibration ensures safe, consistent performance with a power curve tailored to the new cylinder configuration.
Athena racing‑grade manufacturing
The forged piston is CNC‑machined for reduced friction and increased mechanical strength, while the high‑strength piston pin ensures long‑term reliability under elevated loads. All components follow Athena’s racing‑derived manufacturing standards for precision and durability.
Complete kit, ready for assembly
All required gaskets are included, making the kit ready for professional installation within OEM Honda tolerances.
- Oversized cylinder with high-performance forged piston
- Includes pre-mapped GET Boost module for easy install
- Advanced materials for superior strength and reliability
- Premium gaskets ensure perfect and lasting sealing
Technical features:
Bore Diameter: 85.0mm
Bore Gain: + 6mm
Compression Ratio: 13.7:1
Displacement:288cc
The ATHENA P400210100073 Big Bore Cylinder Kit is designed for the Honda CRF 250 R model years 2025 and 2026. This kit features an 85 mm bore, providing a direct product reference for applications requiring a big bore cylinder kit.
Built for the specified Honda CRF 250 R application, the kit is identified by ATHENA part number P400210100073. Its product classification is cylinder kit big bore, making it suitable for shoppers seeking a replacement or performance-oriented cylinder kit for the listed motorcycle.
Use the vehicle application and part number to verify suitability before ordering. This product is supplied as one unit, as indicated by the listed unit of measure.
Features:
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