Recommended Additional Upgrades
01
Uma Laser Iridium Spark Plug
Improve ignition with Uma Racing Laser Iridium Spark Plug.
03
Uma Premix Radiator Coolant
The Uma Radiator Coolant with its 40:60 water to coolant blend keeps engine cool longer.
The UMA Racing High Performance Radiator (280ml) for the Yamaha Aerox V2 and NMAX V2 is a cooling system powerhouse. Designed for engines that work harder than stock—specifically those with big bore kits or racing ECUs—it addresses the common issue of overheating in high-performance liquid-cooled scooters.
By increasing the physical size and the liquid volume, it ensures your engine stays within its optimal operating temperature even during aggressive track sessions or long, high-speed tours.
Key Features
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Increased Capacity (280ml): This radiator holds significantly more coolant than the stock unit (approx. 100ml more), providing a larger thermal “buffer” to soak up engine heat.
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Thicker & Wider Core: The core is roughly 50% thicker than the standard OEM radiator. This increased surface area allows for much more efficient heat exchange as air passes through the fins.
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10% Cooling Increase: Through superior materials and design, UMA claims a 10% overall improvement in cooling efficiency over the stock setup.
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Plug-and-Play: Despite its larger size, it is designed as a direct replacement for the Aerox V2 / NMAX V2 (2020+) mounting points. No heavy modifications to the frame or plastics are required.
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Superior Heat Dissipation: Made from high-grade aluminum that transfers heat faster than the lower-density alloys used in factory radiators.
Technical Specifications
| Feature | UMA Radiator 280ml Details |
| Coolant Capacity | 280ml (+100ml over OEM) |
| Core Thickness | Approx. 50% thicker than stock |
| Material | High-Grade Aluminum |
| Compatibility | Yamaha Aerox V2 / NMAX V2 |
| Ideal For | Big Bore Kits (63mm) |
Why Upgrade Your Radiator?
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Big Bore Kits: If you’ve upgraded to a 62mm or 63mm block, your engine is generating much more heat than the stock radiator was designed to handle. This UMA unit prevents “overheating” warnings and potential head gasket failure.
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Tropical Climates: In hot regions (like Southeast Asia), stock cooling systems often struggle in heavy stop-and-go traffic. This radiator helps keep the temp gauge stable.
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Engine Longevity: Engines that run cooler last longer. By preventing the oil from thinning out due to extreme heat, you protect your internal bearings and piston rings.
Installation Tip: Coolant Matters
To maximize the effectiveness of this radiator, do not use plain tap water.
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Use High-Performance Coolant: Pair the radiator with a high-boiling-point racing coolant (like Uma Premix Radiator Coolant).
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Bleed the System: After installation, ensure you properly “bleed” the air out of the cooling system. Air bubbles trapped in the radiator can cause “hot spots” and negate the benefits of the larger capacity.
FAQs
Is this better than stock radiator?
Yes, it offers higher capacity and improved cooling efficiency.
Good for big bore engine?
Yes, seller listings specifically mention suitability for big bore setups.
Plug and play fitment?
Yes for Aerox V2 / NMAX V2 applications.
