Warning! Do not remove the expansion tank or radiator pressure cap when the engine is hot. When the engine is hot, the coolant inside the radiator will be hot and also under pressure. Contact with this hot, pressurised coolant will cause scalds and skin damage.
Note:
- If the coolant level is being checked because the coolant has overheated, with the motorcycle on level ground and in an upright position, also check the level in the radiator and top up if necessary.
- In an emergency, distilled water can be added to the cooling system. However, the coolant must then be drained and replenished with HD4X Hybrid OAT coolant as soon as possible.
Caution! If hard water is used in the cooling system, it will cause scale accumulation in the engine and radiator, and considerably reduce the efficiency of the cooling system. Reduced cooling system efficiency may cause the engine to overheat and suffer severe damage.
1. Allow the engine to cool.
2. Remove the cap from the expansion tank and add coolant mixture through the filler opening until the level reaches the MAX mark. Refit the cap.
![](https://motoinstruction.ru/img/triumph/15/121555.jpg)
1. Expansion tank; 2. Filler cap; 3. MAX mark; 4. MIN mark