I Have tuned and installed EFI kit on 70cc, I plan todo it on 125cc, adding a Turbo Charger, well it would be a foolish until, you have a 125cc on Go Kart(small wheels more speed), But its doable, like the guy said its Totally 100 percent doable but us is Hell Expensive, if you want such kind of modification Contact me, but make sure you have deep Pockets, Real deep....