Originally Posted by Roelof

To be honest, there are 1001 methodes how to break in an engine and all are basically the same: start rich, keep te performance down and work slowly over 1 or 2 liter (depending the starting pinch) to a race tuning. With cheap engines I have done plenty of the quick and dirty way and have broken in several engines within an half liter and the results were also good.

Now for me, I have made 2 break in machines so I do de most work at home.....