I spent quite a bit on my 06 RMZ450, I started to get the dreaded metal shavings in the filter... So I sold it ASAP, the guy who bought it ended up trading it off for something else and last I heard it dropped a valve and tore the head up, bottom end bearing went as well so it needs a new crank and a bunch of other crap. All @ 55hrs (5 of which were put on by those two people)... Glad it wasn't me (I changed oil and filter every ride with Motul 300V, tightened the cam chain every ~10 hours, inspected valves at the same interval, topends every 15, etc... I was beyond religious with maintenance and the bike still had a catastrophic failure). Fun bike to ride, but that bike is a paperweight now, I don't even want to know how much it'd cost to repair it.