Honda CRF250R / CRF250RX Athena 85 mm Big Bore Cylinder Kit – 13.7 : 1
Honda CRF250R / CRF250RX Athena 85 mm Big Bore Cylinder Kit – 13.7 : 1 Compression
🛠️ Description
Turn your 250 into a torque-heavy powerhouse with this Athena 85 mm Big Bore Cylinder Kit. Designed for closed-course competition, it boosts displacement and compression for instant throttle response and higher peak horsepower—while maintaining OEM-level fit, finish, and reliability.
✅ What’s Included
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Athena Cylinder (85 mm bore) – Nikasil-plated aluminum for superior cooling and wear resistance
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Vertex Forged Piston Kit (13.7 : 1) – rings, pin & circlips included
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Complete Top-End Gasket Set for precise sealing and easy installation
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Pre-matched components for perfect clearance and reduced engine noise
📦 Fitment
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2018 – 2024 Honda CRF250R
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2019 – 2024 Honda CRF250RX
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Direct bolt-on installation — no machining required
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For closed-course competition use only (not legal for street or public-land use in California)
🛡️ Warranty Info
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Genuine Athena product with limited manufacturer warranty
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Nikasil coating extends cylinder life and reduces friction
🔑 Key Features
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Increases displacement and compression for improved power delivery
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Nickel-silicon-carbide (Nikasil) plating for durability and cooling
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Matched piston and gasket kit ensures proper fit and longevity
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Stock-look finish retains OEM appearance
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Replacement pistons and gaskets available separately
💲 Price & SKU
Retail Price: $1,027.95
SKU: 68-4718 / P400210100067
Estimated Shipping Weight: 4.25 lb
Handling Time: Ships next business day
📦 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.
