Hello together My Honda scooter Scoopy SH50 1984 makes a very loud buzzing noise when turning up. The sound reminds of something grinding, but not necessarily metallic in my opinion. There is nothing to hear in the stand gas or at low rotation and it gets louder the higher you turn. I changed the drive belt (repurchase no original part). If you run the scooter with open Vario box and without drive belt nothing to hear. I guess therefore that I looked at the gearbox, it looked fine and I refilled new oil (after assembly). The clutch is a little glassy but in my opinion still in order. In the appendix are pictures the video was unfortunately too big if necessary I can send more. I am grateful about every tip! Emil