2012 YAMAHA YZ125 YZ125B, Premix - Smells Like Victory. Born from the award winning YZ competition bikes, YZ125 features a light aluminum frame with a powerful, compact engine with awesome power-to-weight ratio. YZ125 is ready to race out of the crate complete with ProTaper aluminum handlebar, titanium footpegs and gripper seat. Key Features A light aluminum frame housing an amazingly light and compact engine results in an awesome power-to-weight ratio. The YZ125 is ready to race out of the crate, complete with a ProTaper aluminum handlebar, titanium footpegs and gripper seat. A pure motocross machine, the light and nimble YZ125 is the perfect choice for riders stepping up from the 85cc class. Owning a Yamaha 2-stroke is less expensive to maintain.