Breaking in a bike's engine - I

From one guy on a forum:

"As far as i'm concerned, battering a brand new engine like that is totally insane! As with any machined surface, engine internals have very slight surface imperfections. These need to be worked against eachother to produce wear patterns. These wear patterns dictate how well the components will seat together for the rest of their service life.
People get confused with all the conflicting advice, most of which comes from a lack of knowledge.
The main problem with taking it too easy for the first 300 miles or so is, modern oil is so good now and resists friction so well that it is sometimes difficult to cause enough wear and the surface glazes, and never creates a good seal.
The trick is to give it enough revs to produce enough pressure to force the piston rings against the bores but not too much so as cause overheating- Before good wear patterns are established, high revs cause more friction in places (known as troughs and peaks) which in turn cause hot spots that will deform alloy parts/seals/piston rings etc.
Sorry to be a bore, but I work in the engineering/manufacturing industry and see the effects of so called experts abusing machinery all the time and it drives me mad!
The best cause of action for running in modern engines is to take it fairly easy for 300 miles or so, then gradually increase revs. The worst thing you can do is labour an engine or hold it at set revs for long periods. Just vary your engine speed, and build it up gradually.
Agree with you on the oil chang after 300-500 miles though."