I sold my 06 Yamaha WR250F and bought an 07 KX450F from a friend. 3 tanks of gas on a new top end with Wiseco piston, MRD Pro Comp exhaust, KYB forks of an 11', Applied Factory 21.5mm offset triple clamps, DID dirt star rims, Renthal sprockets, DID chain, JD Engineering jetting, Boysen accelerator pump with adjustable leak jet, EBC rotors, Twin Air filter, and a fresh valve job. I went through a rear tire in 3 rides. It isn't super pretty but its smooth as hell in the woods and the power goes without saying.