I know I saw a lot of them in motorcycle parking. This video was taken at turn 19 at lap 1 or 2 of the moto 2 race. I love the sound of the 600cc moto 2 bikes.
http://vid897.photobucket.com/albums/ac177/sreinschmidt/A546F302-EA66-46B1-B5DE-D1A44D4C3EDB_zpsayxxzqnd.mp4