I've been wondering, for those of you who know what a rotary engine is, how come they haven't put them in dirtbikes at all? Theres been a few motorcycles with rotaries but i've never heard of any dirtbikes with them. Today it's all about saving emissions and fuel economy and such, and the rotary engine is perfect for that. It can produce more power than a piston and uses less fuel. If the dirtbike companies wanted to be more eco friendly they could mount a rotary engine in heir dirtbikes, or at least make a prototype, because then you'd have the power of both 4 stroke and the high end of 2 stroke, but you'd also have the fuel economy and emissions of a 4 stroke. All you would have to do is scale the engine down so that it would fit in the chassis, you wouldn't have to worry about the power to size ratio. It all makes sense and seems like a genius idea, so why haven't they done it yet?