This is a great app for any motorcycle and dirtbike enthusiast, especially for those who love Yamaha and the WR line of motorcycles.Pictures, Specs, features, history of the WR line of Yamaha motorcycles.Yamaha, WR, WR400, WR400F, WR426, WR450, WR450F, history, 1998, 2001, performance, changes, model, WR250, 250F, 2003, 2007, 2008, 2009, frame, suspension, YZ, YZ250F, YZ450F YZ250, YZ125, YZ450