Ok...my son has a redcat tornado. It was fine at first then after a month or so it would not go full speed. I changed the gears and exhaust. Its a 2 speed. Still was not going full speed. A local shop said it didn't seem like engine was putting out full power and may have lost compression. Anyway so I purchsed a RCPower Ops italian engine. I installed it and still the same thing! It seems like something is restricting the buggie from going full speed. What could be the problem? I have checked to make sure the tires are not rubbing against anything and that no rocks or anything is stuck anywhere that would restrict it? If anyone has any advise i would appreciate it.