If the AMA Motocross Nationals have shown us anything this year, it is that 125cc two-strokes are no longer competitive against 250cc four-strokes in professional motocross. Perhaps, the AMA wants to kill 125cc two-strokes, but assuming that it does not, what engine capacity would allow two-strokes to be competitive in outdoor motocross against 250Fs? 150cc? 175cc?
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