My first bike was a '73 TS125 Duster. I was going to upgrade to the 185, but instead went street for awhile. That's a 2-stroke bike. It made nice power, is a good enduro machine & isn't heavy. Parts may be a problem. And you won't make very many friends with the blue smoke coming out the back!
But 2-strokes rule in my book, any day. Best of luck with it.