Cylinder and control unit kit electronics GET Athena Big Bore 290cc Honda CRF 250 R 25-26

Cylinder and control unit kit GET Athena Big Bore 290cc electronics kit for Honda CRF 250 R 2025-2026.

If you are looking for more power, faster response and a more consistent torque delivery for your Honda CRF 250 R, this Athena 290cc Big Bore kit is the perfect upgrade. Ideal for riders who want to get the most out of the CRF 250 R MY 2025-2026 and feel a fuller, more progressive engine with stronger drive out of every corner.

The Cylinder oversized aluminum cylinder with high silicon alloy features an integrated steel liner to ensure thermal stability and efficient heat dissipation. The high-performance forged piston, with wrist pin and Piston rings included, is designed to work in perfect harmony with the new bore, offering extreme durability, minimal wear and superior sealing even under prolonged use and demanding riding conditions.

With this kit you will experience a more aggressive engine with more immediate acceleration at the throttle in any riding phase. Athena developed this kit using its racing experience to optimize it.

The included GET Boost electronic module is preconfigured for the CRF 250 R Big Bore 2025-2026. It connects directly to the injector and throttle body connectors, allowing quick plug & play installation without replacing the original Honda ECU. The dedicated mapping guarantees robust and linear power delivery, perfectly balanced with the new Cylinder.

The CNC-forged piston combines mechanical strength, lightness and reduced friction. The high-hardness wrist pin ensures reliability even under racing use. All necessary gaskets are included.

Key points

• Cylinder oversized cylinder with high-performance forged piston
• GET Boost module included, preconfigured and easy to install
• Advanced materials for maximum strength and reliability
• Premium gaskets included for perfect, long-lasting sealing

Technical specifications

• Displacement: 288.83 cc
• Bore diameter: 85.00 mm
• Bore increase: +6 mm
• Net weight: 2.03 kg
• Compression ratio: 13.7:1