I break my 2 strokes in by the "2 minute plan".

Start the engine, peak it out and then back off 1/8 turn.

Let run wide open for 2 minutes, then shut down and let the engine completely cool off.

Run out your first tank this way.

If the engine was very tight to begin with, I would run a second tank this way also, other wise go fly it.

Back off on the needle valve 3/16 - 1/4 turn for the first 30 minutes of flying time, then run it as you usually would.

This works very well with ABC, ABN, etc. DO NOT USE THIS PLAN IF IT IS A RINGED ENGINE, it will damage the engine.