"why dont karts do standing starts?"
Because the load created to start a kart quickly from rest is higher than kart clutches are designed for, so you are likely to get more clutch failures.
Because kart clutches are centrifugal, fast starts tend to overheat the clutch, and weld the clutch block to the drum, which can get very expensive. Since the routine for a fast getaway would involve holding the kart on the brake while revving beyond the engagement point and 'slipping' the clutch the result is predictable.
Because classes like Formula Blue and TKM which use restrictors to limit the amount of lead (and there's a thread around about the silly amount of lead some drivers use) would become unequal, the lighter driver having an big advantage.
It won't solve the problem, it will introduce another one, the fast starter who thinks he can gain x number of places from the start alone and will survive the corner 'because the speeds are slow' so is super aggressive.
After all, F1 cars hit that first corner at slow speeds (for them) and they still have a large number of pileups, and they are better drivers than most of the karting fraternity.
"Just thinking about how many times the karts have to go around again because its to fast, karts out of position etc"
You would still have to do one or two laps before coming to a stop, just as the gearbox do because otherwise the excuse is 'cold tyres'. A standing start seems to take at least a minute longer than a rolling start.
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