▁road ▁racing . ▁The ▁Y Z M ▁was ▁far ▁ahead ▁of ▁all ▁competition ▁among ▁four - stroke ▁mot oc ross ▁b ikes . ▁Doug ▁Henry ▁pil oted ▁the ▁Y Z 4 0 0 M ▁to ▁its ▁first ▁victory ▁in ▁ 1 9 9 7 ▁at ▁the ▁Las ▁Veg as ▁Super cross . ▁This ▁was ▁the ▁first ▁time ▁any ▁four - stroke ▁had ▁won ▁an ▁A MA ▁event . ▁The ▁Y Z 4 0 0 M ▁was ▁the ▁prede cess or ▁of ▁the ▁production ▁Y Z 4 0 0 F , ▁which ▁was ▁released ▁the ▁next ▁year . ▁ ▁First ▁generation : ▁Y Z 4 0 0 F ▁ 1 9 9 8 – 2 0 0 0 ▁ ▁Yam aha ▁introduced ▁the ▁Y Z 4 0 0 F ▁in ▁production ▁in ▁ 1 9 9 8 ▁after ▁a ▁successful ▁A MA ▁season ▁in ▁ 1 9 9 7 . ▁It ▁was ▁" the ▁first ▁modern ▁production ▁four - stroke ▁mot oc ros ser ▁that ▁was ▁directly ▁compet itive ▁against ▁two - st ro kes ." ▁Initial ly , ▁Yam aha ▁target ed ▁a ▁dry ▁weight ▁of ▁ 2 3 3 ▁pounds ▁( 1 0 6   kg ) ▁( on ▁par ▁with ▁the ▁ 2 5 0 ▁two - st ro kes ▁of ▁the ▁time ), ▁but ▁by ▁production , ▁the ▁bi ke ▁we ighed ▁ 2 5 0 ▁pounds . ▁The ▁bi ke ▁had ▁an ▁ 1 1 , 6 0 0   r pm ▁red line ▁power ▁and ▁tor que ▁close