H2O Performance Additional Water Radiator Kit – Yamaha R6 RJ11 (2006–2007)

Long days in the saddle or hard sessions on track demand a cooling system that keeps pace with you. The H2O Performance additional water radiator kit is engineered specifically for the Yamaha R6 RJ11 (2006–2007), supplementing the stock radiator to deliver meaningfully greater thermal capacity — so your engine stays in its comfort zone no matter how hard you push.

Key Features

• Substantially increases total cooling capacity by adding a high-performance radiator alongside the OEM unit — no full replacement required
• Optimised fin and channel architecture maximises heat dissipation at all engine speeds and ambient temperatures
• Precision fit for the Yamaha R6 RJ11 (2006–2007) — designed for a clean, factory-quality installation
• Race-proven construction handles the sustained thermal loads of trackdays, mountain passes and summer touring alike
• Reduces temperature spikes under hard acceleration, preventing power-limiting thermal protection from cutting in
• Lowers long-term thermal stress on engine internals, gaskets and oil, extending component life

All-Day Confidence, Whatever the Conditions

Riders who cover serious miles know that comfort is inseparable from reliability. When coolant temperatures climb on a hot afternoon commute or a demanding mountain road, the standard R6 RJ11 radiator is working at its limits — and so are you. The H2O Performance kit extends that limit significantly. By distributing the heat load across a supplementary radiator, operating temperatures remain stable and predictable, giving you one less thing to think about and letting you focus entirely on the ride.

The result is an engine that responds cleanly and consistently throughout a full day of riding, without the edginess that comes from thermal stress. Throttle response feels smoother, the power delivery is more linear, and the engine note settles into that reassuring evenness that only comes from a motor running well within its thermal envelope.

Performance on Track and Road

For trackday regulars, the benefit is immediate and measurable. Session after session, the coolant temperature gauge sits lower and steadier. There are no anxious cool-down laps, no need to manage your pace around heat cycles. On the road, the advantage is equally real — sustained high-speed touring, aggressive back-road riding and slow-moving summer traffic all become significantly less demanding on the cooling system.

H2O Performance designed this kit to bolt on as an addition to the existing cooling circuit, preserving all OEM functionality while adding substantial reserve capacity. Installation is clean and the fitment is exact for the RJ11 chassis.

Who This Kit Is For

• Owners of a Yamaha R6 RJ11 (2006–2007) who ride hard or in warm climates
• Trackday riders looking to remove thermal limitations from their sessions
• Sporty road riders who cover long distances and want engine protection to match their pace
• Anyone seeking to safeguard engine longevity by reducing sustained thermal stress

Fitment & Compatibility

This H2O Performance additional water radiator kit is designed exclusively for the following fitment:

• Yamaha R6 RJ11 — 2006 and 2007 model years

Please verify your frame code before ordering to ensure correct fitment.

Specifications