Agm motors gmx 550 one vario torn

Hello guys I bought my scooter very cheaply for 120€ and there it was already that he stood forever now my belt is torn and I have installed a new one which is a bit too wide and therefore not quite fits despite the fact that the wheel turned back only the problem with the thing he has no train forward so you hear he turns mega high in the stand and screams very loud but he does not move from the spot it can be that the weights are broken because it’s funny to hear or what it can be please answer lg