Dyno Run-In
A contentious topic.
It can be
claimed, that by running the engine in "harder" with a varying load and at varying rpms it will improve the bedding in of the piston rings.
This may reduce blow-by of fuel/air mix past the rings and reduce fuel contamination of the oil.
Also works in reverse by reducing the amount of oil vapour entering the combustion area.
Some say it is better to run-in via the manufactures suggested methods as they, having designed and built the bike, know it best.
Others say that it is pretty much ready to run directly from the factory due to muchly improved manufacturing and finishing methods and so does not need the gentle run in.
I choose to run-in the bike on the dyno for a simple reason. 80km of running-in under controlled conditions. Three oil/filter changes to remove the metalic debris of a new engine (have you seen what comes out of a new engine after 20-40 km of running? Ugly stuff!) and it meant that when I jumped on an unfamiliar bike, that i did not have to worry about looking at the RPMs to stay within the "Guidelines" while I was settling into the bike.
Don't get me wrong, I am not one for thrashing machinery, I have spent too much time fixing it to do that. I don't usually play in the upper RPM range, hence why the Bandit appealed to me. But that doesn't mean that I want to watch a tacho while in Sydney traffic.
This site has some more info and probably explains it better.
http://mototuneusa.com/break_in_secrets.htmDave.