Some great vids, thanks for the info guys.
They certainly do look suspiciously like the Scorpa 4t's, that's for sure. It was no secret Scorpa were using the Yamaha WR250F motor, so it sorta makes sense. That long motor sits odd in the chassis though, makes the tank look very high, as it did on the Scorpas.
The backflip was a great bit of showboating, and was cool!