It's basically an XT500 - rebuilt and breathed on a bit. More fun than I expected to ride but a sod to start. We had a right motley collection, my XR and CR250, a 74 CR125, the little blue 80s Yammy IT200 and the XT. The old stuff is great as long as you avoid any big hits. Low seat and low COG is very confidence inspiring. I can't wait to get my old RM250 together now.
My faves were the two CRs - my 250 is batshit crazy, it would still try and loop in 4th gear if you sat back to get traction. It's altogether too much: Begbie in bike form in every sense.
The little CR125 is bicycle tiny but still goes well if you really wind it out. You can absolutely stuff it into berms WFO, just with a ping of clutch to pop it back into the powerband on the way out. Makes you feel like a bit of a hero.