125 carb to efi conversion – GT125

Not possible with any of hyosung’s parts.   Maybe buy a GV125-S EFi donor bike and try to retrofit everything in to the GT Frame (not easy but not impossible)

Stay with carb, EFI = more problems if things go wrong as they have a LOT (A LOT) of sensors!

Or maybe find some custom megasquirt ECU and learn to program it , and go through some trouble finding needed parts to make GT125 EFi  (the effort will mean it is still better to stay on carbs)

No it won’t work, the amount of work involved to make it efi is simply not worth the effort. Just go and buy a fuel injected bike it will be cheaper, stick with carbs far better for tuning & one hell of a lot less hassle.