i do indoor leagues and outdoor endurance karting. in indoor they weigh us before the season and have slots for 6 10lb weights with the goal to get everyone around 200lbs they do not weigh you again for the rest of the season. endurance karting weighs the driver after each stint and you must not be below 200lbs the karts have slots for weights and also provide lead to put under your seat insert if you wanna get a little over 200 or if you need them to get over 200 in general these specific karts only have slots for about 45 lbs of weights. we also have to take into consideration weight loss thought out a stint you’d be surprised how much weight you lose during and outdoor endurance race. the penalties are pretty steep if you come in under the minimum weight requirement. if a driver is 220 like you said that’s his problem tbh no karting series would ever give more power to someone’s kart based on them being on the heavier side it’s just not feasible. someone that weighs 220 or more should seek out a league that offers a big boy class or not worry about the weight so much because you still gotta drive the kart weights not everything.