I've got an 08 WR450 with about 9000ks on the clock. Been bulletproof, however over the past three months it's developed a problem where it stalls frequently at low revs - just above or at idle when applying throttle. You go to accelerate and it just cuts out. I've raised the idle, but it still does it. I've done some searching around here and common advice is fuel screw. However, why would it have run perfectly for over a year and over 8000 or so ks, and just now develop this problem? Could it be a symptom of something else.