Wow, that's pretty crazy: Junior world champs = 2-stroke only (65, 85 and 125).
This might be the case already, but to have locked it in for 2010 and beyond is a BIG statement.
Wonder how Honda feels about that?
The MX2 class as under 23 only is weird - I can remember in the early 1990s when the 250 2-strokes were touted as being the premier class... And now those same bikes are restricted to the 'junior' adult class.
It will be interesting to see how the 250Ts fare against the 250Fs at that level.