Bought a condor SY 125T-20B scooter. After driving for 7 months 1000 km, there was noise on the axle. When refueling, you can hear the sound of oil return, but there is no sound. ...

There is no part in the rear axle of scooter, which bearing is good and which bearing is bad, but you don't want the bearing to be bad. It may be the metal crash that the starting turbine in the belt box failed to return immediately. Just remove the sludge and put some oil in it, because the viscosity of oil is very high and it is difficult for the turbine to return. After the car starts, it becomes thinner with the heat of the engine. Open it and have a look If it doesn't work, change the turbine. Not much money.