It's been about 2 years since ive started my xb9sx. Got a new battery, and she fired right up. After idleing for 5-10 minutes or so i gave a few moderate revs then shut her down because i wanted to check the oil itself, and oil level. As i'm unscrewing the filler cap a bunch of air starts blowing out like it had built up a good amount of pressure. Now i could be mistaken, but i dont ever remember these swingarms/oil tanks building pressure like that.. please tell me i'm wrong, and that this is normal.