H2O Performance Additional Water Radiator Kit for Yamaha R3 (2015-2026)

The stock cooling system on the Yamaha R3 is competent for everyday riding, but push the engine hard on a track day, ride through a summer heatwave, or run a tuned setup and thermal headroom disappears fast. The H2O Performance additional water radiator kit is engineered specifically to eliminate that weakness — expanding the cooling circuit with a precision-built supplementary radiator that keeps coolant temperatures stable wherever the road or circuit takes you.

Key Features

• Significantly increased cooling capacity through additional radiator surface area, reducing peak coolant temperatures under sustained hard use
• Optimised fin structure maximises heat dissipation, maintaining the engine in its ideal thermal operating range
• Robust, durable construction built to withstand the vibration and stress of both road and racing environments
• Straightforward integration alongside the stock radiator — no major modification required
• Reduces thermal wear on seals, gaskets and engine internals, improving long-term reliability
• Ideal for tuned or power-upgraded R3 builds where the factory cooling system is already at its limit

Build Quality and Materials

H2O Performance has built its reputation supplying cooling upgrades to club racers and track day enthusiasts who cannot afford overheating-induced engine damage. This supplementary radiator kit reflects that heritage: the core is constructed for durability under repeated thermal cycling, the fin geometry is engineered rather than generic, and every component is selected to cope with the demands of sustained high-rpm operation. The result is a unit that feels purposeful and substantial — not an aftermarket add-on, but a genuine engineering solution.

Performance on Road and Track

Once installed, the difference is tangible. Coolant temperature spikes that previously appeared during track sessions or slow-moving summer traffic flatten out. The engine runs more consistently across the entire rev range, power delivery feels cleaner, and the nagging anxiety about climbing temperature gauges disappears. For riders already running an aftermarket exhaust, a power commander, or other performance upgrades, this kit addresses the thermal gap those modifications can open up. For standard road riders in hot climates, it provides a reassuring buffer that the factory setup simply cannot match.

Who This Kit Is For

• Yamaha R3 riders who use their bike hard on road or track and want to eliminate thermal stress
• Track day riders and those entering club-level racing on the R3 platform
• Commuters and touring riders operating in high ambient temperatures
• Owners of modified or performance-upgraded R3 machines where heat management is critical
• Anyone who prioritises engine longevity and wants maximum reliability from their R3

Fitment & Compatibility

This kit fits the Yamaha YZF-R3 across the full production run from 2015 through to 2026. It is designed to integrate with the existing cooling circuit without significant disassembly or fabrication work.

Specifications

• Brand: H2O Performance
• Type: Supplementary water radiator kit
• Fitment: Yamaha YZF-R3 (2015-2026)
• Function: Expands stock cooling circuit for increased thermal capacity
• Core design: Optimised fin structure for maximum heat dissipation
• Installation: Integrates alongside OEM radiator, no major modification required
• Intended use: Road, sport, track day and racing