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:
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Aluminum Cylinder with Nickel-Carbide Coating (85.00 mm)
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Forged Piston with Moly Coating
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High-Performance Anodized Power Valves (not compatible with OEM)
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Note: Cylinder head not included
🔧 Key Features:
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🔥 Race-Ready Big Bore Power – Increases displacement to 289cc for serious gains
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💧 Larger Water Jackets – Improved cooling for extended performance
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⚙️ Forged Piston – Durable and molybdenum-coated for low friction
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🧪 Nickel-Carbide Cylinder Coating – Ultra-tough and built to last
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🧩 Race Power Valves – Custom designed, hard-anodized, high flow
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🛠️ OEM Fitment – Direct bolt-on fit (except OEM power valves & head)
✅ Compatibility:
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2018–2024 Honda CRF250R
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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.
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
