If I am right in thinking that you mean either keep up or out accelarate a larger engined bike thay are two main difference in the larger bikes 1. your bike is a 2 stroke and it can be bored and rehoned to a 180cc 2nd the power valves will have to be re seated and the ports will have to be widened and re shaped and most sport 2 strokes have restrictors in the exhaust and on the c.d.i unit witch will have to be modified and the engine usualy destroys it self after 3 to 4000 miles but you could keep up with some 4 stroke's for a while but it is realy not worth it unless you have money growing on trees and it will cease or spit the piston rings out and damage the cylinder and if it ceases at speed the likley hood is the back wheel will lock up resulting in injury or a fatality to the rider. sell it and get a bigger bike its safer and cost effective. I found out the hard way with a suzuki rg 125 and then a cagiva mito 125