Yamaha YZ250 (2003–2025) 72mm Big Bore 293cc Race Cylinder Kit – Athena P400485100042
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:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
