dwilmot-

Yes, the smoke is mostly from the higher oil content in heli engines. Just follow the fuel recommendations for break in. This is a ringed engine. The 50SX is a pretty good engine but that was discontinued. It should be run a bit rich at first, but not excessively. A tank or two should be enough for you to get a sense of it settling in and getting smoother. Just follow the instructions and you'll be okay. If you have any more questions, ask them here.