I have a 100CC Yamaha KT-100 kart that I think would beat my SVT up to about 60, but then I start to run out of puff and gear. I think eventually the SVT would catch up with a 125 shifter, I just don't know how long it would take. More a mental excersize then anything. Usually my kart stays right with my car because I strap it to the roof to bring it to the track.