Hey all, I'm a pretty young guy, but I'm very interested in vintage motocross and old-school bikes as a whole. I live in Russia, and we've got a lot of CZ's here, and they're much cheaper than more modern Japanese bikes. Being a full-time student with no job and not much in the way of savings, obviously this is quite tempting. But, on the other hand, having owned more than one 20+ year old machine (Honda ATC's, among other things), I know just how big of a money pit it can end up being. I'm pretty set on getting a CZ, and now I just have to decide what to look for, a 125 or a 250 (or a 413 )? I'm about 140 lbs, 5'10"... my past bike was a YZ125 from 1990 or so, and a 2001 YZ80 before that, so I'd like something about that size. Are all the CZ frames identical in size, or is the 125 noticeably smaller than the 250 and 413? Is the 413 too extreme for me? Which bike is better to setup as a woods/enduro type machine? Anything to look for (trouble spots) when examining the bike? Any inherent weak spots that I should check more often or replace outright? Thanks for the help in advance!