More than the Mojave is worth. If it's more power you want, it will be cheaper to buy a bigger machine.
It would be very difficult to find a turbo small enough (in air flow capacity) for a 250cc engine. And that would be the easiest part, everything after that (a lot) would be expensive, time consuming and difficult.
Aftermarket turbocharging is a very simple idea that is very difficult to make work well.