A nitro engine needs to be tuned to the enviroment. Depending on the temperature and humidity you will have to tune it differently. They are quite easy to tune right out of the box. Once you get them going and tuned thats all you need to do is start them and they will run as long as you have gas. I would recommend a revo 3.3 or Losi XXL because they are very durable and hard to roll. The savage engine is kinda junk.