Do you mean method or whether it's broken in?
There are many argued ways of doing a break-in. The most common method involves:
1. Choose your nitro percentage for break-in for the proper hysteresis process, and DO NOT change nitro percentage after break-in (or you will need to re-run a break-in)
2. Do not run idle tanks
3. Running the engine at as rich a condition as possible and at no more than 1/4-1/2 throttle for at LEAST 8 tanks
4. Break it in under LOAD, that is, put it on the ground and drive it around at the above throttles during the break-in
5. Allow FULL COOLING between tanks to aquire a proper heat cycling
There are many actual methods.