You don’t need to pre mix your oil with the petrol, the Aerox has an autolube system. There is an oil tank for the 2 stroke oil under the cover between the footboards. The oil is pumped into the engine at the correct dose depending on throttle position and engine revs. If your oil system is faulty and you are switching to premix, you will have to increase the jet size in the carb, because when you mix the oil with the petrol it weakens the mixture,( less petrol is flowing into the engine as its diluted with oil ) this can lead to overheating and seizure.