I rode about 20 miles over to a friends home tonight and just after getting off the freeway exit I noticed the bike started to run a little rough and had a lot of vibration. I didn't really think to much of it but when parked at my friends house I looked over at my bike and noticed a shiny oil film on the left side of the radiator guard screen and then on the horn and left engine cover. At a closer look it blew the large hose off the engine on that side at the bottom of the front cylinder behind the toe shift lever. I am thinking it is the engine breather hose and wondering why it was blown off the engine. I bought a better screw type clamp and put it back on as the spring type of hose clamp on it was pretty loose. Would deceleration from higher speed and downshifting put enough pressure inside the engine to blow off this hose or would I need to look into this further? I downshift pretty much every time I stop but this is the first time something has happened like this hose coming off.