The 2009 MotoGP World Championship begins under floodlights in Qatar this weekend. Here is a team-by-team preview, followed by a summary of the main rule changes, heading into the new 17-round season.

Join Grand Prix motorcycle racing’s top riders, including Jorge Lorenzo, Casey Stoner, Dani Pedrosa and multiple world champion Valentino Rossi, as they battle each other throughout the intense 2009 ...