Recently I bought a used Webra 61 Speed with TN carb. The seller just say that the engine seems to run very little. In fact the engine looks like new with a bit "browned" piston. I mounted the engine in a Tower Hobbies 60 Trainer. The engine start easy using 0% nitro fuel, at 3 1/2 turn, and an APC 11X5 prop. after a dead stick during take off, I reopened the intake needle valve setting it to 4 turns, The plane take off and performs a 5 minute fly at 1/2 throttle withouth problems. It seems that the engine is almost new, and don't know if is necessary to complete a break in process.- I'm afraid to damage the engine if run it at full throttle. I handled the engine cylinder after landing and the engine wasn't hot. Do I perform a break in process?