Can you pinpoint the area of the engine where the noise is coming from and do you know anyone else with a KDX that you can compare it with? Most KDX noise originates from the power valve; the centrifugal advance actuator in the right side case, to be exact. The other culprit could be piston noise (slap, wobble,and rattle). Looking at this in an optimistic light, I would guess power valve. Go back and read posts from your last thread re: oil, and add enough to take it up to the top of the sight glass (about 700 ml. total). I use BelRay but I take it that you don't so use whatever you feel comfortable with. With the extra oil, see if it's any quieter. If it is then your noise could be the power valve. Is the noise louder when the bike is cold? If it is, the piston might be the cause since they quiet down a bit with (heat) expansion. You didn't say how the bike runs other than the noise! If it runs and shifts ok, maybe it's just getting a bit tired (it is a 94). I know at my age I make some sounds that I didn't as a kid. As a last (or first) resort take it to a good shop and ask their opinion.