OK guys, I'm a noob here and I am seriously thinkin' bout gettin' a new '07 xr650l.....Like in the next month or two. First off-road bike me ! I have heard you all say these are "bullet proof", but what I'm looking for is a little more definition. How many miles on average will this thing go without any motor work? (except valve adjust). Also if anyone has a maintenance routine I would appreciate it very much !!! Thanx in advance !