OK thanks for the info.
Thankfully I had a short stint on Nathans TE310 2011 on the weekend and wow what that engine compared to my WR250 2nd and 3rd on hill no issue lots of power. More engine breaking with a little more engine vibration noticeable compared to the super smooth WR.
It made my 250 seem like a toy compared with the TE310's all round engine grunt (in 250 terms) and ride ability. Its funny you only notice whats different and take for granted all of the great capabilities which are the same. Such as big things like handling and weight. Truly a great bike bet it becomes heaps popular even more than the 350's and 390's in the mid range sizing.