Cylinder Works Big Bore Cylinder Kit CW11011K01 — Honda CRF250R / CRF250RX 2018-2021

Product Description

Unlock elite-level power for your Honda CRF250 with the Cylinder Works CW11011K01 Big Bore Cylinder Kit. Engineered to bump your displacement up to 270cc, this kit provides a significant increase in mid-range torque and peak horsepower. It is the ideal upgrade for riders who want to stay at the front of the pack without sacrificing the reliability of their engine.

Each kit features a precision-cast aluminum cylinder with a nickel silicon carbide sleeve for superior heat dissipation and reduced friction. By bundling this with a high-compression 13.9:1 Vertex piston, Cylinder Works ensures consistent power delivery and reduced engine noise. Designed as a "drop-in" solution, this kit requires no machine work on your engine cases, allowing for a professional-grade upgrade in your own garage.

Top Features: Cylinder Works Big Bore Kit

• Engineered Power: Increases displacement to 270cc for substantial torque and acceleration gains.
• Performance Piston: Includes a matched, high-compression (13.9:1) Vertex piston, rings, pin, and clips.
• Durable Construction: Nickel silicon carbide cylinder plating offers exceptional wear resistance and heat management.
• Direct Fit: Designed for easy installation, replacing your stock cylinder without the need for additional case machining.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Will I need to change my fuel mapping after installation?
A: Yes, because this kit increases the displacement to 270cc and features a high compression ratio, it is highly recommended to re-map your EFI or use a fuel tuner to ensure the engine runs at optimal air/fuel ratios.

Q: Can I use pump gas with this 13.9:1 compression ratio?
A: Due to the high compression ratio, we strongly recommend using high-octane race fuel or a premium blend to prevent pre-detonation and ensure engine longevity.

Expert Pro-Tip

Expert Pro-Tip: Since you are increasing displacement, heat management is critical. Inspect your radiator hoses and flush your cooling system with a high-performance coolant during this rebuild. Proper break-in is also essential—keep your engine loads varied for the first few hours to allow the piston rings to seat correctly against the new cylinder wall.

Recommended Pairings

Recommended Pairings:
o Honda 4-Stroke Performance Parts
o Essential Engine Assembly Tools
o High-Performance Coolants & Break-in Oils

About Moto-House MX

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.

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