Hey Guys,<br /><br />My friends yamaha sputters to a halt after running WOT for almost exactly 15 minutes, every time we go out. It runs like a top prior to that, starts right up, accelerates smoothly to WOT. After it conks out, if we pump the ball, it is fine. It almost seems like the breather is clogged and creating a vacuum in the tank, but we pulled the line and it is clean.<br /><br />Any ideas?<br /><br />Thanks in advance.