I have an 2006 aerox. The engine is stock, besides a 17.5 carb, and a extra v2 exhaust. The transmission is Malossi MHR overange variator, malossi delta clutch, A malossi clutch bell, white clutch springs, 5g rollers now. It goes about 70km/h. What would i need to do to get it to do like 90 km/h? Thank you.