Quote Originally Posted by chruk bashre View Post
as i was pacing around thinking about the crankcase breather hose,
it must suck air, that is why it is now on the airfilter, the hose
will suck the air out so the new bikes dont run so lean.
I believe that it "breathes" meaning that as the pistons go up and down, the air within the crankcase also expands and contracts and therefore sucks and blows as it runs.