In 2002, the FIM became concerned at the advances in design and engineering that resulted in higher speeds around the race track; regulation changes related to weight, amount of available fuel and engine capacity were introduced. The amended rules reduced engine capacity to 800 cc from 990 cc and restricted the amount of available fuel for race distance from in year 2004 to in year 2007 and onwards. In addition, the minimum weight of four-cylinder bikes used by all participating teams was increased by .