H2O Performance Additional Water Radiator Kit – Yamaha R1 / R1M RN32/RN49 (2015–2019)

When your Yamaha R1 or R1M is being pushed hard on track — lap after lap, session after session — the stock cooling system is working at its absolute limit. The H2O Performance supplementary radiator kit adds a high-efficiency cooling surface directly to the OEM circuit, delivering measurably lower coolant temperatures, greater thermal headroom, and the consistent engine behaviour that serious track riding demands.

Key Features

• Supplementary high-performance radiator that expands the factory cooling circuit without replacing it
• Racing-specification fins engineered for maximum heat dissipation and high coolant flow efficiency
• Robust aluminium construction — lightweight and fully race-worthy
• Precision fit for Yamaha R1 RN32 / RN49 and R1M, 2015–2019
• Eliminates temperature spikes during long stints, hot laps, and demanding summer road rides
• Keeps the crossplane engine operating within its optimal thermal window across every rev range

Engineered for the Track, Proven on the Road

The RN32/RN49 generation R1 and R1M combine a high-revving crossplane inline-four with sophisticated electronics and aggressive chassis geometry — a combination that generates substantial heat under racing conditions. The H2O Performance kit addresses this directly: by supplementing rather than replacing the OEM radiator, it increases total cooling capacity without disrupting the factory architecture. The result is a demonstrably cooler, cleaner-running engine that recovers faster between sessions and resists thermal-induced power drop-off throughout a full track day.

Real-World Gains After Fitment

• Stable coolant temperatures across all load conditions, including full-throttle exits
• Fewer temperature peaks during extended high-speed stints
• More consistent power delivery and smoother throttle response
• Quieter engine behaviour and shorter thermal recovery time between sessions
• Significantly reduced thermal stress on engine internals, seals, and the wider cooling system

Who This Kit Is For

This kit is the logical next step for any R1 or R1M owner who regularly attends track days, competes at club or national level, runs a tuned or power-upgraded engine, or simply wants the confidence of additional thermal safety on long, fast road rides. If you demand maximum reliability from your RN32 or RN49, this is one of the most effective single upgrades you can make.

Fitment & Compatibility

• Yamaha YZF-R1 RN32 — 2015, 2016, 2017, 2018, 2019
• Yamaha YZF-R1M RN49 — 2015, 2016, 2017, 2018, 2019

Specifications