In 1998 Yamaha brought the four-stroke back into the motocross mainstream with the introduction of the YZ400F. Using technology from their road-race team Yamaha brought an all-new level of performance to the Open class with the revolutionary YZ400F. While this first version was heavy and somewhat temperamental at times, it was a quantum leap forward from previous four-stroke race machines and the beginning of a movement that would transform the sport in the decade to come. | The Motocross Vault

1998 500cc GP Namur | 90s Motocross

1998 Motocross des Nations: Foxhills Turns Into a Slip 'n Slide—Who Needs a Track Anyway? | Motocross Qc