While you may run across larger displacement two-stroke dirt bikes, models topping out at 500cc are more common. Honda's CR500, trusted by daredevil Robbie Knievel for jumping the Grand Canyon, is ...

While it's long gone in favor of four-stroke motocross bikes, the Honda CR500 holds a legendary place in dirt bike history for its raucous performance.

It's evident that 450cc four-stroke dirt bikes are faster than 250cc two-strokes. If the 450 wasn't faster, professional motocross and supercross riders would be racing 250cc two-strokes.