H2O Performance Additional Water + Oil Cooler Kit for Yamaha R6 RJ15 (2008–2016)

Riding your Yamaha R6 hard — whether carving through mountain passes on a warm summer day or logging hour after hour on a long tour — places demands on the cooling system that the standard radiator setup simply was not designed to meet. The H2O Performance additional water and oil cooler kit gives your R6 RJ15 the thermal headroom it deserves, keeping both coolant and oil temperatures reliably within their optimum ranges so you can focus on the ride, not the temperature gauge.

Key Features

• Combined water and oil cooler kit in a single, complete package — one upgrade addresses both cooling circuits simultaneously.
• Enlarged radiator surfaces with an optimised fin and channel structure deliver significantly greater heat dissipation than the standard setup.
• Consistent coolant and oil temperatures maintained even in stop-and-go traffic, prolonged high-speed runs, and demanding track days.
• Substantially increased thermal reserve eliminates heat soak and power drop-off during intense or sustained use.
• Reduced thermal stress on pistons, seals, and oil extends engine life and cuts long-term wear costs.
• Straightforward fitment as a supplementary cooler alongside the existing factory system — no major modification required.

All-Day Comfort and Confidence on the R6

The RJ15-generation R6 is one of the most focused supersports ever produced: light, rev-happy, and relentlessly energetic. That same character, however, means the engine generates heat at a rate the stock cooling system handles only adequately under normal conditions. On a hot day, in heavy traffic, or when you are really pressing on, coolant temperatures climb, oil thins, and the engine begins to pull its punches to protect itself. That invisible compromise robs you of the smooth, consistent power delivery the R6 is capable of.

The H2O Performance kit removes that compromise entirely. By supplementing the factory radiator and introducing a dedicated oil cooler, it creates a thermal buffer that absorbs and dissipates heat before temperatures reach a critical point. The result is an engine that runs with the same calm authority at the end of a three-hour tour as it does on the first cold-start lap — smooth torque, crisp throttle response, and none of the flat spots or hesitation that heat-stressed engines exhibit.

Track, Tour, and Everything Between

This kit is engineered for R6 riders who use their machine properly. If you attend track days and want the peace of mind of a cooling system that will not flag after a full session, this upgrade is the correct answer. Equally, if your riding is predominantly road-based but involves long distances, warm climates, or spirited riding through technical terrain, the H2O kit provides the same protection. High-quality, heat-stable materials ensure durability across the full temperature range that a properly ridden R6 can generate.

What You Notice After Installation

• Stable, consistent water and oil temperatures across all riding conditions and session lengths.
• Smooth, even engine running without heat soak or temperature spikes on the gauge.
• Reliable, linear torque delivery and consistent throttle response at any point in the rev range.
• Improved engine response under sustained load — the bike feels more confident and composed the harder you ride it.
• Reduced long-term wear on oil, pistons, and internal components — your R6 stays in better condition for longer.

Fitment & Compatibility

This H2O Performance additional water and oil cooler kit is designed and manufactured specifically for the following model:

• Yamaha R6 RJ15 — model years 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016

The kit supplements the existing factory cooling system and is designed to integrate without requiring significant modification to the standard setup.

Specifications

• Brand: H2O Performance
• Kit type: Additional water cooler and oil cooler — combined kit
• Fitment: Yamaha R6 RJ15 (2008–2016)
• Function: Supplementary cooling for both coolant and engine oil circuits
• Construction: Heat-stable, high-quality materials with enlarged radiator surface area and optimised fin and channel structure
• Installation: Supplementary fitment alongside the standard factory cooling system
• Intended use: Road, touring, and track day use