▁is ▁the ▁oldest ▁mot ors port ▁World ▁Championship . ▁The ▁ 2 5 0 cc ▁class ▁was ▁replaced ▁in ▁ 2 0 1 0 ▁by ▁a ▁new ▁class ▁called ▁M oto 2 . ▁The ▁ 2 5 0 cc ▁engines ▁were ▁replaced ▁by ▁ 6 0 0 cc ▁engines , ▁which ▁were ▁supplied ▁by ▁H onda ▁to ▁all ▁teams . ▁ ▁Each ▁season ▁consists ▁of ▁ 1 2 ▁to ▁ 1 8 ▁Gr ands ▁Prix ▁cont ested ▁on ▁closed ▁circ uits , ▁as ▁opposed ▁to ▁public ▁roads . ▁Point s ▁earned ▁in ▁these ▁events ▁count ▁toward ▁the ▁rid ers ' ▁and ▁construct ors ' ▁world ▁champion ships . ▁The ▁r ider ' s ▁and ▁constructor ' s ▁championship ▁are ▁separate ▁champion ships , ▁but ▁are ▁based ▁on ▁the ▁same ▁point ▁system . ▁The ▁number ▁of ▁points ▁awarded ▁at ▁the ▁end ▁of ▁each ▁race ▁to ▁the ▁top ▁ 1 5 ▁qual ifying ▁rid ers ▁depends ▁on ▁their ▁pla cement . ▁Point s ▁received ▁by ▁each ▁finish er , ▁from ▁first ▁ 1 st ▁place ▁to ▁ 1 5 th ▁place : ▁ 2 5 , ▁ 2 0 , ▁ 1 6 , ▁ 1 3 , ▁ 1 1 , ▁ 1 0 , ▁ 9 , ▁ 8 , ▁ 7 , ▁ 6 , ▁ 5 , ▁ 4 , ▁ 3 , ▁ 2 , ▁ 1 . ▁Histor ically , ▁there ▁have ▁been ▁several ▁points ▁systems . ▁Results ▁from ▁all ▁current ▁Gr ands ▁Prix ▁count ▁towards ▁the ▁champion ships