My son had his 5th race weekend this past Sunday. It was the first race where I had personally done maintenance to the kart. I replaced his sprocket (Kid Kart) so everything was loosened or removed off the rear axle.
While testing on Saturday, the brake rotor came loose and the sprocket came loose. On his race final, one of the wheel hubs came loose and slid in on the axel, jamming his throttle and ending his race on the first turn.
I have a history of breaking things because I over-tighten. Any advice on how think about tightening nuts and screws on the rear axle or anywhere else?