Who knows there motor go kart knowledge?
it is possible modify your kart and put some bigger wheels on the back, ie lorry wheels with the smallest sprocket on the back axle that you can find, it would be no good for racing as it would handle like sh-t and i wouldn’t drive it but with a tow start i bet the top speed would be untrue do you race karts i did years ago i even got in the british team many years ago!