Breaking in rebuilded engine

[Ivan141]

I recognise the Mototune USA retorics, I'll admit I picked up some usefull info on engine's there too. Nevertheless I would not try the 'hard' break-in method he's advising untill I have seen it work for someone else first.
That's why I already said I dont intend to go into this matter, because it's mostly a clash of opinions...I'd rather see some facts.

The things everyone agrees upon: Use mineral oil during break-in, and change it VERY often (especially right after the first couple of km's) because the metal that comes loose will end up in the oil, you need to get it out regularly. Also change the oilfilter. Furthermore the basic stuff to keep a 4age in good order: always warm it up properly.