Cylinder Works 98 mm Big Bore Cylinder Kit – Yamaha YFZ450 (2004-2013)

Boost your YFZ450’s power and displacement with the Cylinder Works 98 mm Big Bore Kit. Precision-built in the USA, this upgrade increases displacement to 478 cc and delivers improved throttle response, torque, and overall reliability without requiring machining.

✅ What’s Included

• 98 mm Big Bore Cylinder (Gray Finish)

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

• Complete Top-End Gasket Set

⚙️ Key Features & Benefits

• Displacement Increase to 478 cc – +3 mm overbore for stronger bottom and mid-range power

• Nickel-Silicon Carbide Coating – OEM-grade surface for durability and reduced friction

• Vertex Piston Pairing – Ensures optimal fit, longevity, and quiet operation

• No Machining Required – Direct bolt-on replacement for OEM cylinder

• Made in the USA – Built to OEM tolerances for a perfect fit and finish

📦 Compatibility

• Yamaha YFZ450 (2004–2009, 2012–2013)
  • 2004–2005 → 468 cc output
  • 2006–2013 → 478 cc output

• YFZ450 Special Edition (2006–2008)

• YFZ450 Bill Balance Edition (2006–2007)

🛡️ Warranty Info

Manufacturer warranty included.
Professional installation and proper tuning are recommended to ensure performance and longevity.

💲 Price: $808.95 (Suggested Retail)
🔢 SKU: 0931-0425 / 23001-K01
🏷️ Brand: Cylinder Works