Kayaba Travel Control Valve forks, as fitted to 86 CR125, and 87 YZs & KXes.
I recall reading/hearing that you can simply remove the travel control valves, but I've also heard that it's it more involved (but never with any details).
So... Any input?
I've got an 87 YZ250T, which was widely criticised for harsh forks that still bottomed easily.