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Motocross World Championship
FIM Motocross World Championship is the premier championship of motocross racing, organized by the Fédération Internationale de Motocyclisme (FIM), currently divided into two distinct classes: MX1,and MX2. Race duration is 30 minutes plus 2 laps per moto. The series runs 18 events with two motos at each round.
==Overview==
The Motocross World Championship is a worldwide motocross series sanctioned by the F.I.M.. It was inaugurated in 1957 using a 500 cc engine displacement formula.〔(【引用サイトリンク】title=History of Individual Motocross World Championships )〕 In 1962 a 250cc class was added and in 1975, a 125cc class was introduced. Prior to 1957, the championship was known as the European Championship.
In 2002, the F.I.M. changed the displacement formulas to reflect the changes in engine technology and as a move towards environmentally friendlier four-stroke engines. The new MX1 class became the premier class, allowing two-stroke engines of up to 250cc and four-stroke engines of up to 450cc.〔 The MX2 class allowed two-stroke engines of up to 125cc and four-stroke motors of up to 250cc. The MX3 class allowed two-stroke engines of up to 500cc and four stroke engines of up to 650cc.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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