Theres 2 classes adults and 9hp super class.
In order to go on 9hp you need to beat a time depending on your weight (you also ned to beat that time in 5 different races cant be all in one race)
I myself have to beat a 41.00 on a 150 class
You can find all the info on ontrackkarting.com (to answer ur question it all depends kn ur weight but the fastest has been 38.32 by a girl who works there)
(If i brake in the cams and motor and hook up the boost controller i will deff take out the auto beast!)