I have a 2015 yz450f that i just bought brand new off of the showroom floor. Im worried now because after last weeks ride it was pissing steam out of the vent tube on top of the valve cover while doing a fairly steep hill climb. After this happened i started to pay closer attention to the tube and i noticed that at idle it blows alot of air out of it . The pressure decreases as i get on the throttle. Is this normal or is the bike fudged already. Thank you for the help.