If you are talking about the pipe on the gray rocker cover, that cartel ventilation pipe. That is, when the engine warms up and reaches certain temperatures, the engine oil starts to evaporate. The producers send the evaporated oil to the throttle in order not to release it into the atmosphere, and from there it is burned in the combustion chamber and mixes with the atmosphere.
You can either buy a new one and replace it. The price is between 100 and 200 liras. You can prevent leakage by wrapping the electrical tape tightly.