Yamaha YZ85 (2019–2025) 47.50mm Stock Bore Race Cylinder Kit – Athena P400485100076

Yamaha YZ85 2019–2025 47.50mm Stock Bore Factory Works Race Kit – Athena Description Mini MX power, factory-level — the Athena P400485100076 is a complete stock-bore race cylinder kit for 2019–2025 Yamaha YZ85. 47.50mm nickel-carbide plated aluminum cylinder with larger water jackets, Factory Works porting, removable bronze dome head for higher compression/anti-detonation, hard-anodized power valves, Cast-Lite flat-top piston, and full top-end gasket set — bolt-on, no machining for instant mini/supermini domination.

What’s Included

• 47.50 mm Aluminum Cylinder – nickel-carbide coated, larger water jackets, Factory Works porting
• Aluminum Cylinder Head – removable bronze dome (higher compression, anti-detonation)
• Hard-Anodized Power Valves – high-flow, non-OEM
• Cast-Lite Flat-Top Piston Kit – rings, pin, clips
• Athena Top-End Gasket Set – head/base gaskets, seals, hardware

Key Features

• 47.50 mm stock bore — direct OEM replacement, no boring
• Nickel-carbide plating — extreme durability, low friction
• Larger water jackets — better cooling under race load
• Factory Works porting — max airflow, pro-tuned performance
• Removable bronze dome head — higher compression, detonation resistance
• Hard-anodized power valves — faster response, longer life
• Made in Italy — race-proven precision

Fitment

• 2019 Yamaha YZ85
• 2020 Yamaha YZ85
• 2021 Yamaha YZ85
• 2022 Yamaha YZ85
• 2023 Yamaha YZ85
• 2024 Yamaha YZ85
• 2025 Yamaha YZ85

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

Price & SKU Retail Price: $1,019.95 SKU: 0931-0975 / P400485100076 Weight: 4.86 lbs Availability: In Stock