Watch Eli Tomac completely obliterate His Outdoor Motocross Track on his 2005 Factory KX 250 in #TwoMac! So just what is the difference between a two-stroke motocross engine and a four-stroke engine? The most resolute difference is the high revving sound of the two-stroke engine itself.
Here’s how the technical dudes explain it:
The main difference between the two-stroke and four-stroke engine is that the two-stroke engine has only two cycles; as compared to the four-stroke, which has four.
The two cycles in the two-stroke engine are, intake/compression and power/exhaust stroke. In other words, the four-stroke engine utilizes significantly more moving parts in its makeup, yet makes much more power, torque, and pulling power. Long the domain of the two-stroke, the four-stroke bikes began taking over big-time world-class motocross and supercross in 1997 when Monster Energy’s Doug Henry became the first rider to ever win a supercross on a four-stroke-powered race bike. Got all that?