Yamaha YZ450F & YZ450FX (2018–2019) 102mm Big Bore 496cc Race Cylinder Kit – Athena P400485100068

Yamaha YZ450F/FX 2018–2019 102mm Big Bore 496cc Factory Works Race Kit – Athena Description +46cc of pure fury — the Athena P400485100068 is a complete 102mm big bore race cylinder kit that turns 2018–2019 Yamaha YZ450F & YZ450FX into 496cc monsters. Nickel-carbide plated aluminum cylinder with larger water jackets, Factory Works porting, forged 12.3:1 molybdenum-coated piston, and hard-anodized power valves — plug-and-play power for MX, supercross, or enduro domination. Cylinder head not included.

What’s Included

• 102.00 mm Aluminum Cylinder – nickel-carbide coated, larger water jackets, Factory Works porting
• Forged Piston Kit – 12.3:1 compression, molybdenum coating, rings, pin, clips
• Hard-Anodized Power Valves – high-flow, non-OEM
• Athena Top-End Gasket Set – head/base gaskets, seals, hardware

Key Features

• 102 mm big bore — +46cc (450 → 496cc)
• Nickel-carbide plating — extreme durability, low friction
• Larger water jackets — better cooling under race load
• Factory Works porting — max airflow, pro-tuned performance
• 12.3:1 forged piston — explosive mid-top power
• Hard-anodized power valves — faster response, longer life
• Made in Italy — race-proven precision

Fitment

• 2018 Yamaha YZ450F
• 2019 Yamaha YZ450F
• 2018 Yamaha YZ450FX
• 2019 Yamaha YZ450FX

Warranty Info Backed by Athena limited warranty. Professional installation recommended. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Price & SKU Retail Price: $1,236.95 SKU: 0931-0960 / P400485100068 Weight: 4.36 lbs Availability: In Stock