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Message: [QUOTE="SFO, post: 90485, member: 21864"] KLX's are particularly noted to go to zero lash due to crap-ola valve material. I used to make all the valves for Larry Roeseler at KMPI. He wouldn't even run them(OEM) in brand new bikes. With one piece stainless valves in place, valve clearance fluctuation became history. The XR is air cooled as well, so the thermal retention could be a problem. We used to run our z50 to zero lash riding it so much. It would slowly get slower.(imagine that) Then it would stop starting, because the valves were actually hung open to far, to have enough compression to start. [/QUOTE]