To answer your question,the 2000 was basically all new.It has almost
nothing in common with the 1999.The 2001 is basically the same bike as the
2000 model,with very minor changes.Mostly just little tweaks here and there.
I just bought a 2000 CR125r and I love it.If you want more bottom end,do
as I did and get a front and rear pipe,and go UP a tooth or two on the front
and rear sprocket.That's all I did to the bike and trust me there is plenty of
bottom end power.That is a bunch of crap about the bike having no low end.
I ride with guys with 250's,300's,426's and I keep up just fine.And the bike
is and feels so light.It handles fantastic,and the fit and finish are #1.
Get the 2000!
89vett