not sure, but i know my buddies 250f and 450's both have had major problems pretty much every 6 months
my friend is on his 4th complete engine rebuild on his 250f it's an 07, and his honda 450 is on its second rebuild 06
my other friend has been having issues with timing, his cam chain keeps skipping teeth on the cam sprocket, and he pays somebody to put a new cam chain/tensioner in it once every couple months at 2-300 a pop as well as a valve adjustment every 10-15 hours for 1-200 a pop
i've seen more honda's stop running than any other bike on the track, i personally think its the single cam design, it just puts too much stress on the valve train for them to have that "honda reliability"