Hi, I've got a 08 wr450f, it's got around 3000 miles on the clock. I bought the bike 3-4 months ago and due to a restricted licence I've only just got it on the road and ridden it. The problem is that if you open up the throttle while under 3500-4000 revs the bike judders like crazy, once you've passed the 3500-4000 rev mark the juddering stops. The juddering is kind of like a car would judder/kangaroo if you were doing 20 mph in fifth gear. Is this normal ?. Other than the juddering the bike sounds and rides spot on. Any advice would be greatly apreiciated.