Originally Posted by treybrad
Keep us posted on what you find out -- my '08 is making a similar noise. I can't quite pinpoint it, but it's a high pitched squeal coming from somewhere in the lower end. If I give it a touch of throttle to increase the idle, it quiets down. Does yours do that? Been doing it for the last 500mi or so, I have right around 2,800mi on it, doesn't seem to get any worse, oil change didn't have any impact.
Did you ever work this one out? i've got the same issue on a new to me wr250r with 11000km. I'm wondering how serious it is? I'm suspecting the water pump.