This is not karting but it is pretty impressive in terms of efficient riding. The guy in the football outfit on the 100cc carries his momentum so well he wins against the 750cc super bikes. Give it a couple laps for him to build up steam and prepare to be impressed. I am guessing it’s a question of geometry and weight.
I am also guessing this is China from the air pollution masks. (Can’t tell if it’s mandarin or not.)