Moto GP, the premier class of GP motorcycle racing, has changed dramatically in recent years. In 2002, rule changes were introduced to facilitate the phasing out of the two-strokes. The Moto GP rules permitted manufacturers to choose between running two-stroke engines of 500 cc or less or four-strokes of 990 cc or less. Despite the significantly increased costs involved in running the new four-stroke machinery, the four-strokes were soon able to dominate their two-stroke rivals. As a result, by 2003 no two-stroke machines remained in the Moto GP field.
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