yes its possible bro.
im 99% sure its plug and play to older bikes.
Mikuni BS25 is the same carb as yamaha nouvo z
or a little bit smaller than Nouvo Elegance BS26 with TPS
For the boys who wants quick upgrade no hassle, this is the easier mods!
for other boys who wants better upgrade, bigcarb slide type is best
I will post once i will be able to get a parts catalog...