For mini bike stuff, check with Powroll first -- they're the four stroke minibike gurus that all the other shops buy from (including XR's only and Engines Only).
www.powroll.com
None of the XR80's or Xr100's have had limiters in the past. I haven't seen an '01 XR80, but I believe it's the same.
The only "governor" on the little XR's is the exhaust. Honda made the stock exhaust much less restrictive on the '01 models, but they can still be replaced with a good aftermarket system for better top end.
Hope this helps you out.