2012 YAMAHA YZ250 YZ250B, We Love the Smell of Premix in the Morning. Our legendary two-stroke Supercross winner is more potent than ever with a light aluminum frame housing a patented YPVS Power valve-equipped engine that delivers great power-to-weight ratio. YZ250 is ready to race out of the crate complete with ProTaper aluminum handlebar, titanium footpegs, gripper seat and Excel rims. Key Features A light aluminum frame housing a patented YPVS Power valve-equipped ripper of an engine results in an awesome power-to-weight ratio. The YZ250 is ready to race out of the crate, complete with a ProTaper aluminum handlebar, titanium footpegs, gripper seat, and Excel rims. Owning a Yamaha 2-stroke is less expensive to maintain.