make shure you got 2-3 engines tuned good and newer with the clucth setup and everything ready to swap out quick. grease all your crown gears good,go with higher diff fluids and shock fluids, ceramic bearings, make it easy to switch out receiver battery, oil clutch bearings every 2 pits,and drive smooth, and easy on the gas to not stess the motor as much and longer clutch life. id also have my pit man spray the arms and stuff with wd40 every 5-6 pits just to keep the friction down.