Hi, I have just bought an aerox with either a 70cc big bore or a 77cc not exactly sure, it was fitted by a garage and is still being run in by me so it does have a higher ratio of 2 stroke oil. My mates 50cc aerox will do 45mph however mine struggles to reach 40mph at the moment. It has been de-restricted and has a leo vinci tt exhaust. Any suggestions as to why..... it could just eb the higher ratio of 2 stroke oil.
Thanks