Yamaha YZ450F Athena 97mm Stock Bore Cylinder Kit – 4-Stroke (2018–2019)

🛠️ Description
Restore your Yamaha YZ450F’s factory performance with this Athena Stock Bore Cylinder Kit. Designed with a 97mm bore and forged piston, this kit is engineered for OEM fitment and durability while delivering Factory Works-level performance. With nickel-carbide coating and precision porting, it provides reliability and power for riders who demand the best from their 450.

✅ What’s Included

• Athena 97mm Nikasil-Coated Cylinder (Stock Bore – 450cc)

• Athena Forged OEM-Style Domed Piston Kit (piston, rings, wrist pin, circlips)

• Athena Top End Gasket Set (all required seals and hardware)

• High-Performance Hard Anodized Power Valves (not compatible with OEM valves)

• All parts brand new in original packaging

📦 Fitment

• Yamaha YZ450F (2018–2019)

🛡️ Warranty Info

• Manufacturer warranty included

• Professional installation recommended

• Warranty void if improper installation, tuning, or break-in procedures are followed

🔑 Key Features

• Stock bore 97mm (450cc) – 12.8:1 compression ratio

• Aluminum cylinder with nickel-carbide coating for durability

• Ported to Factory Works specifications for optimized performance

• Forged piston kit for strength under extreme racing conditions

• Complete top end gasket set included

• Direct OEM replacement – does not include cylinder head