The Titan 12T 550 motor will require a short break-in period to ensure optimum performance and longer motor life. For the first battery pack, use the stock installed pinion gear and drive smoothly on a flat, paved surface. Accelerate smoothly (avoiding full throttle starts), with most of the driving being done at higher speeds. Do not use the brake or put the model into reverse during this time. This will help insure that the motor provides the best performance and longest life.