Looking to get dirty this summer? Look no further than this 2000 Yamaha WR400F out of Centennial, Colorado. Priced ridiculously low at just $600, this old Yamaha is just the thing for bombing around trails or tearing through the forest. This bike has definitely been around the block, and the numerous scuffs show that it's been well used and well loved in its 19 years, but for six Benjamins you really can't go wrong with this one.