Had a 04 CRF250r rode some motocross but mostly trail riding. Did all required maintenance and still ahd a catastophic engine failure. Got a 07 WR450 couple weeks back. Anyone who is thinking of getting one will not be dispointed. After free mods, it is a great bike! I was a little nervouse going to a 450 because of my size (5'7", 150 lbs). I have NO regrets. I was amazed how light the bike feels. For my riding style it handles great. The bottom end torque is awesome. My 250 used to struggle pulling up a hill we ride. The WR lugs up it like there was nothing to it! Rode my brother early 2000 DRZ400 and it rode more like a heavy street/enduro bike than a dirtbike. The 450's have come a long way. LONG LIVE THE WR!!