Guys there is kit for CG125 which makes it 166CC. It comes with new cylinder piston rings and a new cam. Its quite expensive and not worth in paki market.
If you really need more power than get a bigger bike dude. Cause with all the modes you will do to your bike, it will still not be same as being build by a manufacture. Quality will suck for sure and it will be a problem bike.
I have been working on big machines for last 15 years. For instance Harley 883 can be upgraded to 1200 but with all the Harley factory stuff you still can not get the same feeling of tight engine sound. If you do not care about the quality of engine (engine life) and how it sounds then go for it.