Yamaha YZ250 (2003–2025) 72mm Big Bore 293cc Race Cylinder Kit – Athena P400485100042
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Yamaha YZ250 2003–2025 72mm Big Bore 293cc Factory Works Race Kit – Athena Description +27cc of pure 2-stroke rage — the Athena P400485100042 is a complete 72mm big bore race cylinder kit that transforms 2003–2025 Yamaha YZ250 into a 293cc beast. Nickel-carbide plated aluminum cylinder with Factory Works porting, removable bronze dome head, hard-anodized power valves, forged race piston, and full top-end gasket set — bolt-on power for MX, supercross, or woods domination.
What’s Included
- 72.00 mm Aluminum Cylinder – nickel-carbide coated, Factory Works porting
- Aluminum Cylinder Head – removable bronze dome (higher compression, anti-detonation)
- Hard-Anodized Power Valves – high-flow, non-OEM
- Forged Race Piston Kit – rings, pin, clips
- Athena Top-End Gasket Set – head/base gaskets, seals, hardware
Key Features
- 72 mm big bore — +27cc (266 → 293cc)
- Nickel-carbide plating — extreme durability, low friction
- 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
- 2003–2025 Yamaha YZ250 (all models, including YZ250X where applicable)
Warranty Info Backed by Athena limited warranty. Professional installation recommended. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Price & SKU Retail Price: $1,784.95 SKU: 0931-0440 / P400485100042 Weight: 9 lbs Availability: In Stock
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
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