Because of the limitted rotation of the valve I have found my bearings get clogged with carbon and I believe it slows and/or restricts the valve movement. Find the tech article about serviceing the valve. When you pop the bearings out you will see what I mean. I have always cleaned my bearings and they come out fine. Others here have needed to replace theirs. Others have also experienced carbon build-up on the valve but that has never been an issue for me either. Pull it apart. You'll be glad you did.
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jeff
'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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