I was ridding at a track on sunday, and ridding hard!! I stopped to take a little break, and what do you know i go to ride again and the quad won't start???? So i messed with it for a little and got it to start. It was blowing smoke like crazy!! i quick shut it off......smelled like antifreeze. pushed some out of my overflow on the antifreeze holding tank. And the exhaust was blowing some out. I am guessing the only thing it could be is the head gasket?? Am i correct in that thinking??