I have a 2006 WR 450 with very low hours/miles on it
I just measured the valve clearances and they are all in spec
On the low side of the spec, but still in spec.
I have noticed that when I lug the engine through tight single track
I hear a slight noise sometimes coming from what seems to be the top-end of the engine
If I had to venture a guess, it sounds like the cam chain
Does that slipper-shoe and the tensioner need any attention over time?