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Message: [QUOTE="copyguy, post: 655432, member: 16892"] I may have the same problem but not sure. Sometimes, the instant I let off the throttle I hear what sounds like one knock. It doesn't continue doing it as I decelerate just the one time noise. I have just attributed it to drivetrain lash or the chain slapping but it's real hard to tell where the sound is coming from when your riding. Does the deceleration knock typically happen just once or would it continue to knock continuously through deceleration? Any ideas would be greatly appreciated. It's an 02 250 EXC, the spark plug is a nice dark tan color, I don't remember my jetting settings but I know I have the N3EJ straight taper needle out of a YZ. I've been running this for about a year with no other problems. Thanks [/QUOTE]