🛠️ YFZ450R / YFZ450 98mm Big Bore Rebuilt Engine Assembly (Complete) – Core Required

Looking for maximum power and long-term reliability? This complete rebuilt 98mm big bore engine is assembled using premium components from industry-leading manufacturers like Wiseco, CP, Hotrods, JE, Cometic, Maxlok, and more. Fits all Yamaha YFZ450 and YFZ450R models and years.

NOTE: A usable OEM bottom end core (crankcases + transmission) is required for purchase.

✅ What’s Included:

• Your Used OEM bottom end core (crankcases, transmission, clutch basket)

• 98mm Big Bore Cylinder

• Wiseco, CP, or JE 98mm Forged Piston

• Nitrite Coated Piston Rings

• Chrome Wrist Pin + Circlips

• Hotrods or Wiseco HD Crank Assembly with Rod

• Cometic MLS Big Bore Head Gasket

• Complete Top & Bottom Gasket Kit

• Full Engine Seal Kit

• Heavy-Duty Cam Chain + Guides

• Cam Bearings

• Oil Pump + K&N Oil Filter

• Billet Water Pump Impeller & Shaft

• Mechanical Seal + Water Pump Bearing

• All Transmission, Crank, Balancer, Clutch, and Shift Cam Bearings

• 09–13 Style Talon Clutch Kit Setup

• Maxlok Titanium Head Stud Kit – LIFETIME WARRANTY*

• Complete Titanium Side Cover Bolt Kit

• Engine fully assembled, cleaned, and inspected

• Rings sized to bore by builder

• Runs on pump or race gas

• Comes with 6-Month Limited Warranty*

📦 Fitment:

Fits All Years & Models:

• Yamaha YFZ450 (2004–2013)

• Yamaha YFZ450R (2009–2024)

• YFZ450R Special Edition, Team Yamaha, Bill Balance, Custom Graphics submodels

🛡️ Warranty Info:

• 6-month limited warranty covers parts and labor of included items.

• Does not cover improper installation, tuning, or damage from other parts.

• This is not a DIY-friendly install – professional installation is strongly recommended.

• Warranty claims require physical return of parts for inspection – no exceptions.