Now, for break-in.

24:1 fuel oil mix for a tank, then run 24-32:1 thereafter.
Don't beat on the engine, but don't baby it, and don't be afraid to rev it either.

VARY THROTTLE POSITION AND ENGINE SPEED REGULARLY (A LOT) during the first 10 minutes, and still use a lot of differing throttle settings/engine speeds for a couple hundred miles thereafter.

Idealy, for the first 10-30 minutes you should allways decellerate slowly, taking about twice the Amount of time in seconds you used to accellerate. ie 10 secs. speeding up, 20 seconds to slow it down ect.

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If it ain't broke, and you mess with it long enough, it will be.