search on here for "heat cycle break-in" because there is a whole thread on it, very good information in there
the 'old school' method was to break in with about 5 tanks of fuel, running very rich on the first tank without full throttle bursts, then as you move closer to the 5th tank you lean up a bit and run a bit harder. I used to use that method and never had any problems with it either.
I now use the heat cycle method because it works just fine and is much quicker than the old school method.
Read the break-in method in this thread, it's very similar to what I told you to do and should work great:
http://www.rcuniverse.com/forum/m_55..._1/key_/tm.htm