No, I use the official size. The "kick" is because Karts don't have a differential, you have to anticipate a lot ^^ Use your clutch to reduce oversteer, it's hard as I say. have already scaled down the motor like a Yamaha motor (81.7 kw, 61.7nm) 118bhp instead of 130bhp for a small kart, i need to work on the motor but the kart is hard to drive like any new car in lfs.