Engine break-in

[Gery83]

After a full rebuild, how can I do it properly?

What is ?our opinion about this?
http://www.mototuneusa.com/break_in_secrets.htm

[Brul(tm)]

Well, I just read the article and it's a theory that raises a lot of questions/thoughts. I would like to hear the thoughts from others here on the forum about this matter, who have more experience with this subject or maybe from their profession.

Regards,
Marc

[Juan AR155Q4]

I did a similar break-in. Not full-throttling, but 75-80%.
Used a mineral 30W oil for first 100km, changed for similar until 1000km and the Selenia.

[mindus]

From what I've read and what sport people rebuilding engines are saying, it doesn't really matter which way you will go. If you have time - go for a slow break in. If don't (e.g. a race is next day after you finish engine rebuild, etc.) - you don't have another choice than a fast break-in..

There is one 'golden' rule which you have to follow - no constant RPMs during break in. And it doesn't matter if it's a fast or slow break-in.
On the other hand, if the engine is not built with care and attention to tolerances, etc., you should not blame break-in for engine failure :D