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For bike engines, we used to have a pretty strict break-in for air cooled engines, as they have large tolerances.
You didn't beat the crap out of them. Not a chance. But, you avoided constant throttle situations (long highway drones at a set speed) and deep throttle low rpm running. Also, no snapping 'er to redline. The regiment was to vary your speed, make sure the engine wasn't shut off cold, and load the engine but not lug it.
After 500km's, we'd dump the oil, swap in Mobil 1, put more stress on it for the next 1000km's, then another oil change. Then it was WFO and block-long wheelies!
With that break-in, we had air cooled 11,000rpm engines lasting over 100,000km's with ease. I'm sure the 3K Mobil 1 changes had something to do with it too...
I've followed a similar but less extreme "system" with our cars, and have yet to have any car suffer any kind of premature wear. In fact, we get some really high mileages without problems. Maybe I'm not doing it "right" but I gues I'm not doing it wrong either...
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