Abobobilly ! Brother, Neither this is a sorcery nor it requires a potion to be reversed. I could not get my hands on the latest engine charts of CG125.
I did my research but you know people up here are (almost) laymen, they need pictures, otherwise they don't believe anything. This is why I didn't get back to this topic. However, CG125 Euro 2 (4 Gear) and CG125 Deluxe Euro 2 (5 Gear) have the same top end, and the bottom end of Deluxe is more powerful with a bigger clutch box and some other modifications too.