Cylinder Works Big Bore 270cc Kit for CRF250R/X (04–17) – 81mm

🏁 Cylinder Works Big Bore Cylinder Kit – 270cc | CRF250R & CRF250X (2004–2017)

Fits CRF250R (2004–2009) & CRF250X (2004–2017)
Bore: 81.00 mm | Displacement: 270cc | Compression: 13.0:1

Give your CRF250X or early CRF250R a serious torque and power boost with this complete Cylinder Works Big Bore Kit. Featuring Vertex piston, top-end gaskets, and an OEM-look gray cylinder, this 270cc upgrade is a bolt-on performance solution—no machining required.

📦 What’s Included:

• 81mm Cast/Aluminum Cylinder w/ nickel silicon carbide sleeve

• Vertex Forged Piston Kit (rings, clips, pin)

• Top-End Gasket Kit

🔧 Key Features:

• 🏁 Big Bore Upgrade – Bumps displacement to 270cc for added torque

• 🔩 OEM Look & Fit – Direct bolt-on cylinder, gray finish matches stock

• 🧪 Long Life Materials – Vertex pistons + NSC sleeve resist wear

• 🇺🇸 Made in the USA – Reliable craftsmanship and ready-to-run

• 🛠️ No Machining Needed – Just bolt on and ride

✅ Compatibility:

• 2004–2009 Honda CRF250R

• 2004–2017 Honda CRF250X

💬 Why Choose Cylinder Works?

Cylinder Works kits are a favorite among trail and off-road riders who want a serious power boost without spending a fortune. Reliable, proven, and easy to install—this is how you get more from your CRF250.