The DUSTY R, on that lives in competitions, we decided to take the dusty to a higher level by creating the Dusty R. This engine today has the shaft lightened with red silicone and is with te other hand, is the engine that made the leap in quality. Born as an "entry level" engine, the dusty has done its job well for more than a year, but being that we are purely a company the DLC treatment, completely revised timing, double shield front bearing like that of its older brother DIRT, head 10g lighter than the previous model and it too will come out with the delrin ring in the carburetor bellows