Take the transition from 2-stroke dirt bikes to the 4-stroke machines we see on the track today, for example. The first ...

While there were other more powerful bikes that came before it and several 2-stroke race replicas, it was the very first fully-fired 4-stroke race replica. It was an overnight success, and every ...

Honda's lineup of 450cc four-stroke dirt bikes all wear some version of the CRF450 badge. The series includes the CRF450R, CRF450RWE, and CRF450RX supercross bikes, the off-road focused CRF450X ...

At one time, two-stroke dirt bikes dominated the motocross and supercross racing scene. That is until about 20 years ago, when the two-stroke engine disappeared from motocross above the youth levels.