Cylinder Works 98mm Big Bore Cylinder Kit – Yamaha YFZ450R / YFZ450X (480cc)

🛠️ Step up your YFZ450R or YFZ450X’s performance with this 98mm Big Bore Kit from Cylinder Works. Boosts your displacement to 480cc while retaining stock crankshaft stroke — no case modifications required. Ideal for racers or aggressive trail riders looking for extra power without going stroker.

✅ What’s Included

• 98.00mm Nickel-Silicon Carbide Plated Cylinder

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

• Complete Top-End Gasket Kit

• Direct bolt-on replacement – no machining needed

📦 Fitment

• Yamaha YFZ450R (2009–2023)

• Yamaha YFZ450R SE (2009–2023)

• Yamaha YFZ450X (2010–2011)

• Yamaha YFZ450X Bill Ballance Edition (2010)

• Yamaha YFZ450 (2017)

🛡️ Warranty Info
Covered under Cylinder Works’ limited warranty. Includes defects in manufacturing and craftsmanship. Not valid for racing or improper installation damage.

🔑 Key Features

• 480cc displacement using OEM crank

• 12.0:1 compression ratio for a solid power increase

• Cast aluminum cylinder with nickel-silicon carbide sleeve

• Matches OEM look and install specs

• Made in the USA

• No case mods or re-plating required