Athena Big Bore Kit 289cc for CRF250R & CRF250RX (18–24)

🏁 Athena Big Bore Race Cylinder Kit – 289cc for CRF250R/RX (2018–2024)

Fits Honda CRF250R (2018–2024) & CRF250RX (2019–2024)
Displacement: 289cc | Bore Size: 85.00 mm | Compression: 13.7:1

Boost your Honda’s power with the Athena 289cc Big Bore Race Cylinder Kit—designed for serious off-road riders demanding maximum output, cooling, and durability. Built to race spec, this kit pushes your engine to the next level with high-performance components and expanded cooling capacity.

📦 What’s Included:

• Aluminum Cylinder with Nickel-Carbide Coating (85.00 mm)

• Forged Piston with Moly Coating

• High-Performance Anodized Power Valves (not compatible with OEM)

• Note: Cylinder head not included

🔧 Key Features:

• 🔥 Race-Ready Big Bore Power – Increases displacement to 289cc for serious gains

• 💧 Larger Water Jackets – Improved cooling for extended performance

• ⚙️ Forged Piston – Durable and molybdenum-coated for low friction

• 🧪 Nickel-Carbide Cylinder Coating – Ultra-tough and built to last

• 🧩 Race Power Valves – Custom designed, hard-anodized, high flow

• 🛠️ OEM Fitment – Direct bolt-on fit (except OEM power valves & head)

✅ Compatibility:

• 2018–2024 Honda CRF250R

• 2019–2024 Honda CRF250RX

💬 Why Choose Athena?

Athena’s Big Bore Kits are engineered in Italy for top-tier racing and off-road performance. This 289cc upgrade provides more torque, better throttle response, and serious durability—backed by decades of championship-winning engineering.