Running in.
Means its either a new engine with no miledge on it. Or it just
been overhauled.
What happens is......running in means running your bike/engine at a
slow consistent speed to start the oil running thru your engines
and sort of conditioning it to be ready for more extensive faster
or sharper acceralations.
I am sure there is more well informed, intelligient knowledge-able
bikers out there to advise you.
So above is my humble little understanding of the term running in.
