2-Stroke vs. 4-Stroke: how 2-Strokes disappeared from Pro Motocross. From a time when the BRAAP of 40 2-stroke motorcycle engines scored the sound of the AMA Motocross and Supercross to the near nonexistence of 2-strokes in pro competition, this is the story of how motocross was taken over by high-cost 4-stroke motorcycles at the turn of the century.
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