Vertex 2-Stroke Cast Replica Piston Kit 1999-2024 Yamaha YZ250/X

Tired of sluggish performance? It’s time to unleash your Yamaha YZ250’s true potential with the Vertex 2-Stroke Cast Replica Piston Kit. Engineered for maximum durability, superior performance, and a factory-fresh feel, this kit is the ultimate OEM Replacement your bike needs to get back in the fight. Moto-House MX provides this precision-engineered 66.34mm piston to ensure your YZ250 or YZ250X recovers the snap and throttle response you've been missing.

Vertex pistons are designed for Racing Performance, utilizing a gravity-cast aluminum alloy with an 18% silicon content for an ultra-light yet Heavy Duty build. Each 2-Stroke Cast Replica piston features a high-tech Molybdenum Disulfide (MoS2) coated skirt to reduce friction, resulting in a faster break-in period and significantly longer engine life. Heat-treated with T-5 hardening, these components are built to withstand the rigors of track and trail domination.

Top Features: Vertex Top End Piston Kit

• 2-Stroke Cast Replica Design: Precisely engineered to match the original equipment for a reliable, factory-level feel.
• 66.34mm A-Size: Perfect for new or replated cylinders requiring a standard bore diameter.
• MoS2 Coated Skirts: Specialized coating reduces friction and wear while aiding in the initial break-in process.
• T-5 Hardening: Every piston undergoes a rigorous tempering process for maximum structural integrity.
• Complete Rebuild Kit: Includes the 66.34mm piston, high-quality rings, wrist pin, circlips, top-end gaskets, and a wrist pin bearing.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
1999-2024	Yamaha	YZ250
2016-2024	Yamaha	YZ250X

Frequently Asked Questions

Q: Is this 66.34mm piston compatible with my 2-stroke YZ250?
A: Yes, this is specifically designed as a Cast Replica for the Yamaha YZ250/X 2-stroke engine, maintaining OEM-style performance.

Q: Do I need to re-jet my carb after installing this piston?
A: While designed to OEM specs, jetting adjustments may be required for optimal performance if you have other modifications like an aftermarket exhaust.

Q: How long does it take to break in the new piston?
A: We recommend following a proper heat-cycle break-in procedure—typically 2-3 controlled rides before engaging in sustained full-throttle use.

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Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The best motocross shop in Central Florida.

Yamaha YZ250 and YZ250X Performance Parts Collection