Coventry born Cal Crutchlow crashed out of the bwin Grand Prix Èeské republiky in Brno.
Crutchlow crashed with eight laps to go and tweeted: "Really sorry to my team for not finishing today with a mistake. Tried my best throughout a tough weekend for us. Try again at the next one."
Movistar Yamaha’s Jorge Lorenzo won the race by 4.462s from Repsol Honda’s Marc Marquez, with his team-mate Valentino Rossi in third.