"as low as you can go !" BAD IDEA. That maybe the case if the dirt your racing on has a large amount of grip. Other wise it depends on many factors (driver weight proportion(tall, short, ect),the seat. If the seat is to low the kart will not react. The common signs are that it will never drive decent and will always have a push or loose or no side bite(no mater how much you adjust) that will get better toward the end of the race as the tires warm up. The kart will never have good 4 wheel grip. If so move the back of the seat up 1/2" to 1". Good luck and remember the wrong tire or prep can cause the same issues. Steven67