Felt what only could be described as a 'champagne cork' sound and impact, against my left leg. Huh, the Head cover gasket half-circle popped out of the Head cover, and hit my leg. Turns out it actually 'ripped' right out of the one-piece head cover gasket. Got the bike home, and checked: I had pinched the top end breather hose that goes to the air box. Pinched off completely by the subframe/airboot/carb. Before I tore it down, I opened the door to the airbox, and put my finger over the end of the tube, at the airbox entry point, with a rag tightly covering the blown out gasket piece. Little to no pressure at the tube's end with the motor running. Not good........ This is the vent hose that was pinched closed: So, I ordered a new head cover gasket. Who new? So, the question is, do we need that 3-way vent hose junction near the carb, and the hoses attached, or can we just get away with the Head cover vent hose into the airbox? And shouldn't it run higher up in the box, if possible?