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Message: [QUOTE="john rogers, post: 864061, member: 25177"] I have an 01 KX85 and when it started knocking my son noticed it and though it still ran OK it was lacking bottom end. It turned out the powervalve actuator broke. Probably because the powervalve itself got stuck. I think the 03 has a newer design so that the actuater wont break when the powervalve does get stuck. I would recomend replacing the powervalve when doing the topend. Also check the wear an the cylinder where the PV slides back and forth. John [/QUOTE]