many turbo chargers are available online for sale for bikes as small as 50cc wonder why people dont know about it most of them are Chinese kits .... But I heard they are pretty usless on these small engines...
Even NOS kits for 125s are available, I happen to negotiate with a dealer of NOS for small bikes but at that time I didnt had any import connection who could have helped me out but later on after I joined some international forums I found out that putting a Turbo kit or a NOS is pretty much useless as gain is to little secondly engine dies early in its life.