Rossi leads the way...... enjoy...........Before the 2009 Red Bull US Grand Prix competitors take to the track, some Yamaha Grand Prix legends will gather for a clash of the titans. Kenny Roberts Sr., Wayne Rainey, Eddie Lawson, and Valentino Rossi line up for a Superkarts Exhibition on Thursday at 3:30 pm making the first time all four world champions have the opportunity to be on-track together. Colin Edwards is set to be the official starter. Superkarts, built to race on full-size road courses, are powered by Yamaha TZ250 engines and are capable of incredible cornering speeds and acceleration. Something tells us Roberts and Rossi will get up to speed quickly, but Rainey and Lawson may have an advantage since both have previous Superkart experience. In fact, Lawson has muscled a Superkart around Mazda Raceway Laguna Seca to a lap time only two and a half seconds slower than Casey Stoner’s fastest '08 race lap! The event is free and the paddock is open to fans after 1:00 pm on July 2