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Message: [QUOTE="TimberPig, post: 1012364, member: 66421"] Sounds like your pipe o-rings and possibly the exhaust spigot on the cylinder are shot. From what I remember it is a somewhat common problem on older KX's. As to the hard midrange hit, that too is a characteristic I seem to remember hearing about with them. Cleaning up the jetting will help somewhat, but you may need to consider a flywheel weight to tone down the hit if you find it too much. [/QUOTE]