Reactivate Piaggio Sfera 125 injections

In my own case, I ask for advice from the real experts because of my Piaggio Sfera 125 injection Hello, I bought the scooter in exchange from a 60-year-old – actually – prudent driver. This man was removed after a “rendezvous with the spirit of wine” by the police or the office of the FS. Therefore the scooter was since 4 years dry, but unused, in his garage. Because the man does not need a driving license for a mofa due to his vintage, he gave me his For example, my friend, my workshop owner, told me that it could be difficult to reactivate an injection engine that had not been running for several years, because then the injection pump would often cause problems and cost the necessary exchange for a new one about 600 – 700 €. That would be economically unreasonable. I have a similar statement from the head of a Peugeot two-wheel workshop regarding a 50-wheel Peugeot injection engine. I did not buy it. Now I ask for advice and tips to get the scooter running again with the existing injection pump – or is only the replacement of the injection pump as the only option? Then I could usefully only slaughter the part – or pass it on to a gifted expert. It would be really nice if I received mostly serious answers. Thank you in advance. Wolfgang