i also have a 2003 FE501E.
i have done about 6000kms/115hrs, in about 8 months.
bike is half trail ridden and half flogged around a practice track.
i had a rocker bearing go at about 70hrs, and have just replaced cam bearings and timing chain at 110 hrs.
the high wear on these bearings was most likely due to my ignorance and lack of valve adjustments in first 50hrs that i owned the bike.
i have also had a stator fail. once again, this was due to inexperience with 'bergs. simply put, the stator seals on these bikes do not work, and if you don't keep on eye on them the stator will fail after water seeps in after washing the bike and creek crossings etc.
these are definitely high maintenance bikes. i still love it, and each time something goes wrong, it does seem to be preventable and i am sure it won't happen again after you know to keep an eye on it.
at times i have become frustrated and wanted to go back to a jap bike, but after riding friends bikes before making the big move, you realise how lucky you are to be riding a 'berg.
the real downfall is resale price. i bought mine cheap, and if you see them advertised cheap, bargain a bit more and take it!!
HAVE FUN!!!