Bennche Bighorn 400 Owner's Manual page 162

Periodic Maintenance and Adjustment 8-62
WARNING
POTENTIAL HAZARD
Removing the radiator cap when the engine and radiator are still hot.
WHAT CAN HAPPEN
You could be burned by hot fluid and steam blown out under pressure.
HOW TO AVOID THE HAZARD
Wait for the engine to cool before removing the radiator cap. Always use a thick rag over the
cap. Allow any remaining pressure to escape before completely removing the cap.
NOTE:
If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that
it is changed to the recommended coolant as soon as possible.