The electric 2-pin plug connected to the radiator on your 250cc bike is likely for the radiator fan. Many motorcycles, especially those with larger engines or designed for increased performance, have electric fans attached to the radiator to help dissipate heat.
The fan is controlled by a temperature sensor that detects when the engine reaches a certain temperature threshold. When the temperature rises above that level, the sensor sends a signal to activate the fan. The fan then draws air through the radiator, assisting in cooling the engine coolant. This helps maintain optimal operating temperatures, especially during traffic jams, hot weather, or other conditions that limit airflow to the radiator.
The electric 2-pin plug connects the fan to the electrical system of the motorcycle, allowing it to receive power and operate as needed. If you notice any issues with overheating or the fan not functioning correctly, it's advisable to have it inspected and repaired by a qualified mechanic to avoid potential engine damage.