I've noticed 2 cycle dirt track motorcycles are still quite popular in Europe - more so than in the USA.
It's slightly more archaic over there, since the sport never evolved to the status of our circuits. They still utilize 2 cycle powerplants (over here it's all CRF, YZF, XR, TT, Rotax).
Our national circuit seems to be dying a slow death since the AMA cut-backs, and sponsors pulling out.
I suspect the problem over here might be that we have so much liability coverage to deal with. Insurance.
Possibly more lenient in European circles ? (no pun intended).